Nonvolatile semiconductor memory device
5 claims: 5 independent, 0 dependent
- 1メモリ部と制御部とを備え、 前記メモリ部は、 第1メモリストリングと、第1配線と、第2メモリストリングと、第2配線と、 第3メモリストリングと、 を有し、 前記第1メモリストリングは、第1メモリセル群と、第1選択トランジスタと、を有し、 前記第1メモリセル群は、直列に接続された複数の第1メモリトランジスタを有し、 前記複数の第1メモリトランジスタのそれぞれは、第1半導体層に形成されたチャネルを含み、第1制御ゲートを有し、電気的にデータの書き換えが可能であり、 前記第1選択トランジスタは、前記第1メモリセル群の一方の端の側に設けられ、前記第1半導体層に形成されたチャネルを含み、第1選択ゲートを有し、 前記第2メモリストリングは、第2メモリセル群と、第2選択トランジスタと、を有し、 前記第2メモリセル群は、直列に接続された複数の第2メモリトランジスタを有し、 前記複数の第2メモリトランジスタのそれぞれは、前記第1半導体層と電気的に分離された第2半導体層に形成されたチャネルを含み、前記第1制御ゲートに電気的に接続された制御ゲートを有し、電気的にデータの書き換えが可能であり、 前記第2選択トランジスタは、前記第2メモリセル群の一方の端の側に設けられ、前記第2半導体層に形成されたチャネルを含み、第1選択ゲートと接続された選択ゲートを有し、 前記第3メモリストリングは、第3メモリセル群と、第3選択トランジスタと、を有し、 前記第3メモリセル群は、直列に接続された複数の第3メモリトランジスタを有し、 前記複数の第3メモリトランジスタのそれぞれは、前記第1半導体層及び前記第2半導体層と電気的に分離された第3半導体層に形成されたチャネルを含み、第2制御ゲートを有し、電気的にデータの書き換えが可能であり、 前記第3選択トランジスタは、前記第3メモリセル群の一方の端の側に設けられ、前記第3半導体層に形成されたチャネルを含み、第2選択ゲートを有し、 前記第1配線は、前記第1選択トランジスタの前記第1メモリセル群とは反対の側で前記第1半導体層に接続され、 前記第3選択トランジスタの前記第3メモリセル群とは反対の側で前記第3半導体層に接続され、 前記第2配線は、前記第2選択トランジスタの前記第2メモリセル群とは反対の側で前記第2半導体層に接続され、 前記制御部は、前記第1メモリトランジスタのうちの選択セルトランジスタの電荷保持層への正孔の注入、及び、前記電荷保持層からの電子の引き抜き、の少なくともいずれかを行う選択消去動作の際に、 前記第1配線に第1電圧を印加し、 前記選択セルトランジスタの選択セルゲートに前記第1電圧よりも低い第2電圧を印加し、 前記選択セルトランジスタ以外の前記第1メモリトランジスタの非選択セルゲートに、前記第1電圧以下で前記第2電圧よりも高い第3電圧を印加し、 前記第1選択ゲートに前記第1電圧以下で前記第3電圧以上の第4電圧を印加し、 前記第2配線に、前記第2電圧よりも高く前記第3電圧以下の第5電圧、または、前記第2電圧を印加 し、 前記第3メモリトランジスタの前記第2制御ゲートに、前記第3電圧よりも低い第6電圧を印加し、 前記第2選択ゲートに、前記第3電圧よりも低い第7電圧を印加する ことを特徴とする不揮発性半導体記憶装置。
- 2メモリ部と制御部とを備え、 前記メモリ部は、 第1メモリストリングと、第1配線と、第2メモリストリングと、第2配線と、第3メモリストリングと、 第1他部配線と、第2他部配線と、 を有し、 前記第1メモリストリングは、 第1メモリセル群と、第1選択トランジスタと、 第1他部メモリセル群と、第1他部選択トランジスタと、第1接続部トランジスタと、 を有し、 前記第1メモリセル群は、直列に接続された複数の第1メモリトランジスタを有し、 前記複数の第1メモリトランジスタのそれぞれは、第1半導体層に形成されたチャネルを含み、第1制御ゲートを有し、電気的にデータの書き換えが可能であり、 前記第1選択トランジスタは、前記第1メモリセル群の一方の端の側に設けられ、前記第1半導体層に形成されたチャネルを含み、第1選択ゲートを有し、 前記第1他部選択トランジスタは、前記第1メモリセル群の前記第1選択トランジスタとは反対の側に設けられ、前記第1半導体層に形成されたチャネルを含み、第1他部選択ゲートを有し、 前記第1接続部トランジスタは、前記第1メモリセル群と前記第1他部選択トランジスタとの間に設けられ、前記第1半導体層に形成されたチャネルを含み、第1接続部ゲートを有し、 前記第1他部メモリセル群は、前記第1他部選択トランジスタと前記第1接続部トランジスタとの間に設けられ、直列に接続された複数の第1他部メモリトランジスタを有し、 前記複数の第1他部メモリトランジスタのそれぞれは、第1半導体層に形成されたチャネルを含み、第1他部制御ゲートを有し、電気的にデータの書き換えが可能であり、 前記第2メモリストリングは、 第2メモリセル群と、第2選択トランジスタと、 第2他部メモリセル群と、第2他部選択トランジスタと、第2接続部トランジスタと、 を有し、 前記第2メモリセル群は、直列に接続された複数の第2メモリトランジスタを有し、 前記複数の第2メモリトランジスタのそれぞれは、前記第1半導体層と電気的に分離された第2半導体層に形成されたチャネルを含み、第2制御ゲートを有し、電気的にデータの書き換えが可能であり、 前記第2選択トランジスタは、前記第2メモリセル群の一方の端の側に設けられ、前記第2半導体層に形成されたチャネルを含み、第2選択ゲートを有し、 前記第2他部選択トランジスタは、前記第2メモリセル群の前記第2選択トランジスタとは反対の側に設けられ、前記第2半導体層に形成されたチャネルを含み、第2他部選択ゲートを有し、 前記第2接続部トランジスタは、前記第2メモリセル群と前記第2他部選択トランジスタとの間に設けられ、前記第2半導体層に形成されたチャネルを含み、前記第1接続部ゲートに電気的に接続された接続部ゲートを有し、 前記第2他部メモリセル群は、前記第2他部選択トランジスタと前記第2接続部トランジスタとの間に設けられ、直列に接続された複数の第2他部メモリトランジスタを有し、 前記複数の第2他部メモリトランジスタのそれぞれは、第2半導体層に形成されたチャネルを含み、前記第1他部制御ゲートに電気的に接続された制御ゲートを有し、電気的にデータの書き換えが可能であり、 前記第3メモリストリングは、第3メモリセル群と、第3選択トランジスタと、第3他部メモリセル群と、第3他部選択トランジスタと、第3接続部トランジスタと、を有し、 前記第3メモリセル群は、直列に接続された複数の第3メモリトランジスタを有し、 前記複数の第3メモリトランジスタのそれぞれは、前記第1半導体層及び前記第2半導体層と電気的に分離された第3半導体層に形成されたチャネルを含み、前記第1制御ゲートに電気的に接続された制御ゲートを有し、電気的にデータの書き換えが可能であり、 前記第3選択トランジスタは、前記第3メモリセル群の一方の端の側に設けられ、前記第3半導体層に形成されたチャネルを含み、前記第1選択ゲートと接続された選択ゲートを有し、 前記第3他部選択トランジスタは、前記第3メモリセル群の前記第3選択トランジスタとは反対の側に設けられ、前記第3半導体層に形成されたチャネルを含み、前記第1他部選択ゲートと接続された選択ゲートを有し、 前記第3接続部トランジスタは、前記第3メモリセル群と前記第3他部選択トランジスタとの間に設けられ、前記第3半導体層に形成されたチャネルを含み、第2接続部ゲートを有し、 前記第3他部メモリセル群は、前記第3他部選択トランジスタと前記第3接続部トランジスタとの間に設けられ、直列に接続された複数の第3他部メモリトランジスタを有し、 前記複数の第3他部メモリトランジスタのそれぞれは、第3半導体層に形成されたチャネルを含み、前記第1他部制御ゲートに電気的に接続され、電気的にデータの書き換えが可能であり、 前記第1配線は、前記第1選択トランジスタの前記第1メモリセル群とは反対の側で前記第1半導体層に接続され、前記第2選択トランジスタの前記第2メモリセル群とは反対の側で前記第2半導体層に接続され、 前記第2配線は、前記第3選択トランジスタの前記第3メモリセル群とは反対の側で前記第3半導体層に接続され、 前記第1他部配線は、前記第1他部選択トランジスタの前記第1他部メモリセル群とは反対の側で前記第1半導体層に接続され、 前記第3他部選択トランジスタの前記第3他部メモリセル群とは反対の側で前記第3半導体層に接続され、 前記第2他部配線は、前記第2他部選択トランジスタの前記第2他部メモリセル群とは反対の側で前記第2半導体層に接続され、 前記制御部は、 前記第1メモリトランジスタのうちの選択セルトランジスタの電荷保持層への正孔の注入、及び、前記電荷保持層からの電子の引き抜き、の少なくともいずれかを行う選択消去動作の際に、 前記第1配線に第1電圧を印加し、 前記選択セルトランジスタの選択セルゲートに前記第1電圧よりも低い第2電圧を印加し、 前記選択セルトランジスタ以外の前記第1メモリトランジスタの非選択セルゲートに、前記第1電圧以下で前記第2電圧よりも高い第3電圧を印加し、 前記第1選択ゲートに前記第1電圧以下で前記第3電圧以上の第4電圧を印加し、 前記第2配線に、前記第2電圧よりも高く前記第3電圧以下の第5電圧、または、前記第2電圧を印加し、 前記第2メモリトランジスタの前記第2制御ゲートに、前記第3電圧よりも低い第6電圧を印加し、 前記第2選択ゲートに、前記第3電圧よりも低い第7電圧を印加し、 前記第1他部配線に前記第5電圧または前記第2電圧を印加し、 前記第1他部制御ゲートに前記第3電圧を印加し、 前記第1他部選択ゲートに前記第3電圧よりも低い前記第8電圧を印加し、 前記第1接続部ゲートに前記第1電圧よりも低く前記第2電圧よりも高い第9電圧を印加し、 前記第2他部配線に前記第2電圧を印加し、 前記第2制御ゲートに前記第6電圧を印加し、 前記第2選択ゲートに前記第8電圧を印加し、 前記第2他部選択ゲートに前記第8電圧を印加することを特徴とす る不 揮発性半導体記憶装置。
- 3メモリ部と制御部とを備え、 前記メモリ部は、 第1メモリストリングと、第1配線と、第1他部配線と、第1ベース配線と、を有し、 前記第1メモリストリングは、第1メモリセル群と、第1他部メモリセル群と、第1選択トランジスタと、第1他部選択トランジスタと、第1接続部トランジスタと、を有し、 前記第1メモリセル群は、直列に接続された複数の第1メモリトランジスタを有し、 前記複数の第1メモリトランジスタのそれぞれは、第1ベース半導体層に接触して設けられた第1半導体層に形成されたチャネルを含み、第1制御ゲートを有し、電気的にデータの書き換えが可能であり、 前記第1選択トランジスタは、前記第1メモリセル群の一方の端の側に設けられ、前記第1半導体層に形成されたチャネルを含み、第1選択ゲートを有し、 前記第1他部選択トランジスタは、前記第1メモリセル群の前記第1選択トランジスタとは反対の側に設けられ、前記第1半導体層に形成されたチャネルを含み、第1他部選択ゲートを有し、 前記第1接続部トランジスタは、前記第1メモリセル群と前記第1他部選択トランジスタとの間に設けられ、前記第1半導体層に形成されたチャネルを含み、第1接続部ゲートを有し、 前記第1他部メモリセル群は、前記第1他部選択トランジスタと前記第1接続部トランジスタとの間に設けられ、直列に接続された複数の第1他部メモリトランジスタを有し、 前記複数の第1他部メモリトランジスタのそれぞれは、前記第1半導体層に形成されたチャネルを含み、第1他部制御ゲートを有し、電気的にデータの書き換えが可能であり、 前記第1配線は、前記第1選択トランジスタの前記第1メモリセル群とは反対の側で前記第1半導体層に接続され、 前記第1他部配線は、前記第1他部選択トランジスタの前記第1他部メモリセル群とは反対の側で前記第1半導体層に接続され、 前記第1ベース配線は、前記第1ベース半導体層に接続され、 前記制御部は、前記第1メモリトランジスタのうちの選択セルトランジスタの電荷保持層への正孔の注入、及び、前記電荷保持層からの電子の引き抜き、の少なくともいずれかを行う選択消去動作の際に、 前記第1配線及び前記第1他部配線に第1電圧を印加する、または、前記第1配線及び前記第1他部配線を浮遊状態に設定し、 前記選択セルトランジスタの選択セルゲートに前記第1電圧よりも低い第2電圧を印加し、 前記選択セルトランジスタ以外の前記第1メモリトランジスタの非選択セルゲートに、前記第1電圧よりも低く前記第2電位よりも高い第3電圧を印加し、 前記第1他部制御ゲートに、前記第3電圧を印加し、 前記第1選択ゲート及び第1他部選択ゲートに前記第1電圧よりも低く前記第2電圧よりも高い第10電圧を印加し、 前記第1接続部ゲートに、前記第1電圧よりも低く前記第2電位よりも高い第11電圧を印加し、 前記第1ベース配線に前記第1電圧を印加することを特徴とする不揮発性半導体記憶装置。
- 4前記メモリ部は、第2メモリストリングをさらに有し、 前記第2メモリストリングは、第2メモリセル群と、第2他部メモリセル群と、第2選択トランジスタと、第2他部選択トランジスタと、第2接続部トランジスタと、を有し、 前記第2メモリセル群は、直列に接続された複数の第2メモリトランジスタを有し、 前記複数の第2メモリトランジスタのそれぞれは、第2ベース半導体層に接触して設けられ前記第1半導体層と電気的に分離された第2半導体層に形成されたチャネルを含み、第2制御ゲートを有し、電気的にデータの書き換えが可能であり、 前記第2選択トランジスタは、前記第2メモリセル群の一方の端の側に設けられ、前記第2半導体層に形成されたチャネルを含み、第2選択ゲートを有し、 前記第2他部選択トランジスタは、前記第2メモリセル群の前記第2選択トランジスタとは反対の側に設けられ、前記第2半導体層に形成されたチャネルを含み、第2他部選択ゲートを有し、 前記第2接続部トランジスタは、前記第2メモリセル群と前記第2他部選択トランジスタとの間に設けられ、前記第2半導体層に形成されたチャネルを含み、第2接続部ゲートを有し、 前記第2他部メモリセル群は、前記第2他部選択トランジスタと前記第2接続部トランジスタとの間に設けられ、直列に接続された複数の第2他部メモリトランジスタを有し、 前記複数の第2他部メモリトランジスタのそれぞれは、前記第2半導体層に形成されたチャネルを含み、第2他部制御ゲートを有し、電気的にデータの書き換えが可能であり、 前記第1配線は、前記第2選択トランジスタの前記第2メモリセル群とは反対の側で前記第2半導体層にさらに接続され、 前記第1他部配線は、前記第2他部選択トランジスタの前記第2他部メモリセル群とは反対の側で前記第2半導体層にさらに接続され、 前記第1ベース配線は、前記第2ベース半導体層にさらに接続され、 前記制御部は、前記選択消去動作の際に、さらに、 前記第2制御ゲート及び前記第2他部制御ゲートに前記第3電圧を印加し、 前記第2選択ゲート及び第2他部選択ゲートに前記第10電圧を印加し、 前記第2接続部ゲートに、前記第11電圧を印加することを特徴とする請求項 3 記載の不揮発性半導体記憶装置。
- 5前記メモリ部は、第3メモリストリングと、第2配線と、第2他部配線と、第2ベース配線と、をさらに有し、 前記第3メモリストリングは、第3メモリセル群と、第3他部メモリセル群と、第3選択トランジスタと、第3他部選択トランジスタと、第3接続部トランジスタと、を有し、 前記第3メモリセル群は、直列に接続された複数の第3メモリトランジスタを有し、 前記複数の第3メモリトランジスタのそれぞれは、第3ベース半導体層に接触して設けられ前記第1半導体層及び前記第2半導体層と電気的に分離された第3半導体層に形成されたチャネルを含み、前記第1制御ゲートと接続され、電気的にデータの書き換えが可能であり、 前記第3選択トランジスタは、前記第3メモリセル群の一方の端の側に設けられ、前記第3半導体層に形成されたチャネルを含み、前記第1選択ゲートに接続され、 前記第3他部選択トランジスタは、前記第3メモリセル群の前記第3選択トランジスタとは反対の側に設けられ、前記第3半導体層に形成されたチャネルを含み、前記第1他部選択ゲートに接続され、 前記第3接続部トランジスタは、前記第3メモリセル群と前記第3他部選択トランジスタとの間に設けられ、前記第3半導体層に形成されたチャネルを含み、前記第1接続部ゲートに接続され、 前記第3他部メモリセル群は、前記第3他部選択トランジスタと前記第3接続部トランジスタとの間に設けられ、直列に接続された複数の第3他部メモリトランジスタを有し、 前記複数の第3他部メモリトランジスタのそれぞれは、前記第3半導体層に形成されたチャネルを含み、前記第1他部制御ゲートに接続され、電気的にデータの書き換えが可能であり、 前記第2配線は、前記第3選択トランジスタの前記第3メモリセル群とは反対の側で前記第3半導体層に接続され、 前記第2他部配線は、前記第3他部選択トランジスタの前記第3他部メモリセル群とは反対の側で前記第3半導体層に接続され、 前記第2ベース配線は、前記第3ベース半導体層に接続され、 前記制御部は、前記選択消去動作の際に、さらに、 前記第2配線及び前記第2他部配線に、前記第1電圧よりも低く前記第2電位よりも高い第12電圧を印加する、または、前記第2配線及び前記第2他部配線を浮遊状態に設定し、 前記第2ベース配線に前記第1電圧よりも低く前記第2電位よりも高い第13電圧を印加する、または、前記第2ベース配線を浮遊状態に設定することを特徴とする請求項 4 記載の不揮発性半導体記憶装置。
Independent claims5
280 paragraphs, as filed
The present invention relates to a non-volatile semiconductor storage device.
The conventional flash memory employs a batch erase and selective write operation. In this operation, memory cells that do not need to be rewritten are also rewritten, so that the reliability may deteriorate as the number of times the data is rewritten increases.
In a normal memory, since a plurality of memory cells are formed on a common semiconductor layer on a substrate and the channels of the plurality of memory cells are common, it is difficult to perform selective erasing. On the other hand, Patent Document 1 discloses a method of using a hole generated due to a band-to-band tunnel current for selective erasing, but in the case of this method, the tunnel current is used. As a result, reliability tends to deteriorate, and the drive margin between the selected cell and the non-selected cell is narrow, so that the operation is unstable.
It is expected to realize a memory that can selectively and stably rewrite only a memory cell that rewrites data and can extend the life of the memory cell.
<p><patcit num="1"><text>Japanese Unexamined Patent Publication No. 2006-190820</text></patcit></p>
<p> The present invention provides a non-volatile semiconductor storage device capable of selective erasure.</p>
<p> According to one aspect of the present invention, the memory unit includes a memory unit and a control unit, and the memory unit includes a first memory string, a first wiring, a second memory string, a second wiring, and the like.<u style="single">With the third memory string</u>The first memory string has a first memory cell group and a first selection transistor, and the first memory cell group has a plurality of first memory transistors connected in series. Each of the plurality of first memory transistors includes a channel formed in the first semiconductor layer, has a first control gate, and is electrically rewritable. The second memory string is provided on one end side of the first memory cell group, includes a channel formed in the first semiconductor layer, has a first selection gate, and the second memory string is a second memory cell group. The second memory cell group has a plurality of second memory transistors connected in series, and each of the plurality of second memory transistors has the first semiconductor layer. It includes a channel formed in a second semiconductor layer electrically separated from the first control gate, has a control gate electrically connected to the first control gate, and is electrically rewritable with data. The two-select transistor is provided on one end side of the second memory cell group, includes a channel formed in the second semiconductor layer, and has a selection gate connected to the first selection gate.<u style="single">The third memory cell group includes a third memory cell group and a third selection transistor, and the third memory cell group has a plurality of third memory transistors connected in series, and the plurality of third memory cell groups. Each of the third memory transistors includes a channel formed in the first semiconductor layer and the third semiconductor layer electrically separated from the second semiconductor layer, has a second control gate, and electrically performs data. The third selection transistor is provided on one end side of the third memory cell group, includes a channel formed in the third semiconductor layer, and has a second selection gate. ,</u>The first wiring is connected to the first semiconductor layer on the side of the first selection transistor opposite to the first memory cell group.<u style="single">The third selection transistor is connected to the third semiconductor layer on the side opposite to the third memory cell group, and is connected to the third semiconductor layer.</u>The second wiring is connected to the second semiconductor layer on the side of the second selection transistor opposite to the second memory cell group, and the control unit is the selected cell transistor of the first memory transistor. A first voltage is applied to the first wiring during the selective erasing operation in which at least one of injection of holes into the charge holding layer and extraction of electrons from the charge holding layer is performed, and the selected cell is used. A second voltage lower than the first voltage is applied to the selected cell gate of the transistor, and a second voltage lower than the first voltage and higher than the second voltage is applied to the non-selected cell gate of the first memory transistor other than the selected cell transistor. A third voltage is applied, a fourth voltage lower than the first voltage and higher than the third voltage is applied to the first selection gate, and the second wiring is higher than the second voltage and lower than the third voltage. Apply the 5th voltage or the 2nd voltage<u style="single">Then, a sixth voltage lower than the third voltage is applied to the second control gate of the third memory transistor, and a seventh voltage lower than the third voltage is applied to the second selection gate.</u>A non-volatile semiconductor storage device is provided.<u style="single"> According to one aspect of the present invention, the memory unit includes a memory unit and a control unit, and the memory unit includes a first memory string, a first wiring, a second memory string, a second wiring, and a third memory string. , The first other part wiring and the second other part wiring, and the first memory string includes the first memory cell group, the first selection transistor, the first other part memory cell group, and the first. The first memory cell group has a plurality of first memory transistors connected in series, and each of the plurality of first memory transistors has a other portion selection transistor and a first connection portion transistor. , The first selection transistor includes a channel formed in the first semiconductor layer, has a first control gate, and is electrically rewritable, and the first selection transistor is at one end of the first memory cell group. The first selection transistor is provided on the side, includes a channel formed in the first semiconductor layer, has a first selection gate, and the first selection transistor is opposite to the first selection transistor of the first memory cell group. The first connection unit transistor includes the channel formed in the first semiconductor layer and has the first other part selection gate, and the first connection part transistor is the first memory cell group and the first other part selection. The first other part memory cell group includes the channel formed between the first semiconductor layer and the transistor and has the first connection part gate, and the first other part memory cell group includes the first other part selection transistor and the first other part selection transistor. It has a plurality of first other part memory transistors provided between the one connection part transistor and connected in series, and each of the plurality of first other part memory transistors is a channel formed in the first semiconductor layer. The second memory string includes a second memory cell group, a second selection transistor, and a second other part memory cell. The second memory cell group has a group, a second other part selection transistor, and a second connection part transistor, and the second memory cell group has a plurality of second memory transistors connected in series, and the plurality of second memory cells. Each of the memory transistors is a channel formed in a second semiconductor layer electrically separated from the first semiconductor layer.The second selection transistor is provided on one end side of the second memory cell group, and the second semiconductor can be electrically rewritten. The second selection transistor including the channel formed in the layer and having the second selection gate is provided on the side opposite to the second selection transistor of the second memory cell group, and the second selection transistor is provided. It includes a channel formed in a semiconductor layer, has a second other part selection gate, and the second connection part transistor is provided between the second memory cell group and the second other part selection transistor. The second other part memory cell group includes a channel formed in the second semiconductor layer and has a connection part gate electrically connected to the first connection part gate, and the second other part memory cell group includes the second other part selection transistor. It has a plurality of second other part memory transistors provided between the second connection part transistor and connected in series, and each of the plurality of second other part memory transistors is formed in the second semiconductor layer. It has a control gate electrically connected to the first other part control gate, and data can be electrically rewritten. The third memory string includes a third memory cell group and a third memory cell group. It has a third selection transistor, a third other part memory cell group, a third other part selection transistor, and a third connection part transistor, and the third memory cell group has a plurality of thirds connected in series. It has three memory transistors, and each of the plurality of third memory transistors includes a channel formed in the first semiconductor layer and a third semiconductor layer electrically separated from the second semiconductor layer, and the first It has a control gate electrically connected to one control gate, and data can be electrically rewritten. The third selection transistor is provided on one end side of the third memory cell group. The third selection transistor includes a channel formed in the third semiconductor layer, has a selection gate connected to the first selection gate, and the third other part selection transistor is the third selection transistor of the third memory cell group. Is provided on the opposite side and includes a channel formed in the third semiconductor layer, the firstIt has a selection gate connected to another part selection gate, and the third connection part transistor is provided between the third memory cell group and the third other part selection transistor and is formed on the third semiconductor layer. The third other part memory cell group is provided between the third other part selection transistor and the third connection part transistor, and is connected in series. It has a plurality of third other part memory transistors, and each of the plurality of third other part memory transistors includes a channel formed in the third semiconductor layer and is electrically connected to the first other part control gate. The data can be electrically rewritten, and the first wiring is connected to the first semiconductor layer on the side of the first selection transistor opposite to the first memory cell group, and the second selection is performed. The second semiconductor layer is connected to the second semiconductor layer on the side of the transistor opposite to the second memory cell group, and the second wiring is the third on the side of the third selection transistor opposite to the third memory cell group. The first other part wiring is connected to the semiconductor layer, and the first other part wiring is connected to the first semiconductor layer on the side opposite to the first other part memory cell group of the first other part selection transistor, and the third other part is connected. The second other part wiring is connected to the third semiconductor layer on the side opposite to the third other part memory cell group of the selection transistor, and the second other part wiring is the second other part memory cell group of the second other part selection transistor. It is connected to the second semiconductor layer on the opposite side to the second semiconductor layer, and the control unit injects holes into the charge holding layer of the selected cell transistor of the first memory transistor and from the charge holding layer. During the selective erasing operation in which at least one of the extraction of electrons is performed, a first voltage is applied to the first wiring, and a second voltage lower than the first voltage is applied to the selective cell gate of the selective cell transistor. A third voltage lower than the first voltage and higher than the second voltage is applied to the non-selective cell gate of the first memory transistor other than the selected cell transistor, and the first selection gate is at the first voltage or less. A fourth voltage equal to or higher than the third voltage is applied, and the third voltage higher than the second voltage is applied to the second wiring.The following fifth voltage or the second voltage is applied, and a sixth voltage lower than the third voltage is applied to the second control gate of the second memory transistor to the second selection gate. A seventh voltage lower than the third voltage is applied, the fifth voltage or the second voltage is applied to the first other part wiring, and the third voltage is applied to the first other part control gate. The eighth voltage lower than the third voltage is applied to the first other part selection gate, and the ninth voltage lower than the first voltage and higher than the second voltage is applied to the first connection part gate. , The second voltage is applied to the second other part wiring, the sixth voltage is applied to the second control gate, the eighth voltage is applied to the second selection gate, and the second other part is selected. Provided is a non-volatile semiconductor storage device characterized by applying the eighth voltage to the gate.</u></p><p> According to another aspect of the present invention, the memory unit includes a memory unit and a control unit, and the memory unit includes a first memory string, a first wiring, a first other unit wiring, and a first base wiring. The first memory string includes a first memory cell group, a first other part memory cell group, a first selection transistor, a first other part selection transistor, and a first connection part transistor. The first memory cell group has a plurality of first memory transistors connected in series, and each of the plurality of first memory transistors is a first semiconductor provided in contact with the first base semiconductor layer. It includes a layered channel, has a first control gate, is electrically rewritable, and the first selection transistor is provided on one end side of the first memory cell group. The first selection gate is included, and the first selection transistor is provided on the side opposite to the first selection transistor of the first memory cell group. It includes a channel formed in the first semiconductor layer, has a first other part selection gate, and the first connection part transistor is between the first memory cell group and the first other part selection transistor. The first other part memory cell group includes the first other part selection transistor and the first connection part transistor, which includes a channel formed in the first semiconductor layer and has a first connection part gate. It has a plurality of first other part memory transistors provided between and connected in series, and each of the plurality of first other part memory transistors includes a channel formed in the first semiconductor layer. It has a first other part control gate and can electrically rewrite data, and the first wiring is the first semiconductor layer on the side of the first selection transistor opposite to the first memory cell group. The first other part wiring is connected to the first semiconductor layer on the side of the first other part selection transistor opposite to the first other part memory cell group, and the first base wiring is It is connected to the first base semiconductor layer, and the control unit is connected to the charge holding layer of the selected cell transistor of the first memory transistor.A first voltage is applied to the first wiring and the first other part wiring during the selective erasing operation in which at least one of the injection of holes and the extraction of electrons from the charge holding layer is performed. Alternatively, the first wiring and the first other portion wiring are set in a floating state, a second voltage lower than the first voltage is applied to the selected cell gate of the selected cell transistor, and the first voltage other than the selected cell transistor is applied. A third voltage lower than the first voltage and higher than the second potential is applied to the non-selective cell gate of the memory transistor, and the third voltage is applied to the first other control gate to obtain the first voltage. A tenth voltage lower than the first voltage and higher than the second voltage is applied to the selection gate and the first other part selection gate, and the second potential lower than the first voltage is applied to the first connection gate. Provided is a non-volatile semiconductor storage device characterized in that a higher eleventh voltage is applied and the first voltage is applied to the first base wiring.</p>
<p> According to the present invention, a non-volatile semiconductor storage device capable of selective erasing is provided.</p>
<figref num="1">It is a schematic diagram which illustrates the structure and operation of the non-volatile semiconductor storage device which concerns on 1st Embodiment.</figref><figref num="2">It is a schematic perspective view which illustrates the structure of the non-volatile semiconductor storage device which concerns on 1st Example.</figref><figref num="3">It is a schematic cross-sectional view which illustrates the structure of the non-volatile semiconductor storage device which concerns on 1st Example.</figref><figref num="4">It is a schematic partial cross-sectional view which illustrates the structure of the non-volatile semiconductor storage device which concerns on 1st Example.</figref><figref num="5">It is a schematic diagram which illustrates the structure of the non-volatile semiconductor storage device which concerns on 2nd Embodiment.</figref><figref num="6">It is a table which illustrates the operation of the non-volatile semiconductor storage device which concerns on 2nd Embodiment.</figref><figref num="7">It is a schematic perspective view which illustrates the structure of the non-volatile semiconductor storage device which concerns on 2nd Example.</figref><figref num="8">It is a schematic cross-sectional view which illustrates the structure of the non-volatile semiconductor storage device which concerns on 2nd Example.</figref><figref num="9">It is a schematic diagram which illustrates the structure of the non-volatile semiconductor storage device which concerns on 3rd Embodiment.</figref><figref num="10">It is a table which illustrates the operation of the non-volatile semiconductor storage device which concerns on 3rd Embodiment.</figref><figref num="11">It is a schematic perspective view which illustrates the structure of the non-volatile semiconductor storage device which concerns on 3rd Example.</figref>
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the ratio coefficient of the size between the parts, and the like are not necessarily the same as the actual ones. Further, even when the same part is represented, the dimensions and ratio coefficients may be represented differently depending on the drawings. Further, in the present specification and each figure, the same elements as those described above with respect to the above-mentioned figures are designated by the same reference numerals, and detailed description thereof will be omitted as appropriate.
(First Embodiment) FIG. 1 is a schematic diagram illustrating the configuration and operation of the non-volatile semiconductor storage device according to the first embodiment. That is, FIG. 6A is a circuit diagram illustrating the configuration of the non-volatile semiconductor storage device 101, and FIG. 6B is a table illustrating the operation of the non-volatile semiconductor storage device 101. In the figure (a), some wirings are omitted in order to make the figure easier to see.
As shown in FIG. 1A, the non-volatile semiconductor storage device 101 according to the present embodiment includes a memory unit MU and a control unit CTU.
The memory unit MU has a first memory string MCS1, a first wiring W11, a second memory string MCS2, and a second wiring W21. In the following, an example will be described in which the first bit line BL1 is used as the first wiring W11 and the second bit line BL2 is used as the second wiring W21.
The first memory string MCS1 has a first memory cell group MCG1 and a first selection transistor SGT11. Hereinafter, an example in which the first drain side selection transistor SDT1 is used as the first selection transistor SGT11 will be described.
The first memory cell group MCG1 is connected in series and includes a plurality of first memory transistors MC1A (memory cells MC, for example, first to fourth memory cells MC1 to MC4). Data can be electrically rewritten in each of the plurality of first memory transistors MC1A.
Each of the plurality of first memory transistors MC1A includes a first semiconductor layer SEM1. That is, the plurality of first memory transistors MC1A include channels formed in the first semiconductor layer SEM1. Specifically, each source region, drain region, and channel region (channel) of the plurality of first memory transistors MC1A are provided in the first semiconductor layer SEM1. Each of the plurality of first memory transistors MC1A (first to fourth memory cells MC1 to MC4) has a first control gate CG1A (control gates CG1-1 to CG1-4).
The first drain side selection transistor SDT1 is provided on one end side of the first memory cell group MCG1. The first drain side selection transistor SDT1 includes the same first semiconductor layer SEM1 as the first memory cell group MCG1. That is, the first drain side selection transistor SDT1 includes a channel formed in the first semiconductor layer SEM1. Specifically, the source region, the drain region, and the channel region (channel) of the first drain side selection transistor SDT1 are provided in the first semiconductor layer SEM1. The first drain side selection transistor SDT1 has a first selection gate SG11. In the following, an example in which the first drain side selection gate SGD1 is used as the first selection gate SG11 will be described.
The first bit line BL1 is connected to the first semiconductor layer SEM1 on the side opposite to the first memory cell group MCG1 of the first drain side selection transistor SDT1. The first bit line BL1 functions as the bit line BL in the first memory string MCS1.
In the non-volatile semiconductor storage device 101 of this specific example, the first memory string MCS1 further includes a first other part selection transistor SGT12. In the following, an example in which the first source side selection transistor SST1 is used as the first other part selection transistor SGT12 will be described.
The first source side selection transistor SST1 is provided on the side opposite to the first drain side selection transistor SDT1 of the first memory cell group MCG1 and includes the first semiconductor layer SEM1. The first source side selection transistor SST1 has a first other part selection gate SG12. In the following, an example will be described in which the first source side selection gate SGS1 is used as the first other part selection gate SG12.
The memory unit MU further includes the first other unit wiring W12. In the following, an example in which the first source line SL1 is used as the first other part wiring W12 will be described.
The first source line SL1 is connected to the first semiconductor layer SEM1 on the side opposite to the first memory cell group MCG1 of the first source side selection transistor SST1. The first source line SL1 functions as the source line SL in the first memory string MCS1.
On the other hand, the second memory string MCS2 has a second memory cell group MCG2 and a second selection transistor SGT21. Hereinafter, an example in which the second drain side selection transistor SDT2 is used as the second selection transistor SGT21 will be described.
The second memory cell group MCG2 includes a plurality of second memory transistors MC2A (memory cell MCs, for example, fifth to eighth memory cells MC5 to MC8) connected in series. Data can be electrically rewritten in each of the plurality of second memory transistors MC2A.
The plurality of second memory transistors MC2A include a second semiconductor layer SEM2 that is electrically separated from the first semiconductor layer SEM1. That is, the plurality of second memory transistors MC2A include channels formed in the second semiconductor layer SEM2. Specifically, the source region, drain region, and channel region (channel) of each of the plurality of second memory transistors MC2A are provided in the second semiconductor layer SEM2, which is different from the first semiconductor layer SEM1. .. The control gates of the 5th to 8th memory cells MC5 to MC8 are the control gates of the 1st to 4th memory cells MC1 to MC4 (control gates CG1-1 to CG1-4 which are the 1st control gates CG1A). Is connected in common with.
The second drain side selection transistor SDT2 is provided on one end side of the second memory cell group MCG2. The second drain side selection transistor SDT2 includes the same second semiconductor layer SEM2 as the second memory cell group MCG2. That is, the second drain side selection transistor SDT2 includes a channel formed in the second semiconductor layer SEM2. Specifically, the source region, the drain region, and the channel region (channel) of the second drain side selection transistor SDT2 are provided in the second semiconductor layer SEM2. The second drain side selection transistor SDT2 has a selection gate connected to the first drain side selection gate SGD1.
The second bit line BL2 is connected to the second semiconductor layer SEM2 on the side opposite to the second memory cell group MCG2 of the second drain side selection transistor SDT2. The second bit line BL2 functions as the bit line BL in the second memory string MCS2.
In the non-volatile semiconductor storage device 101 of this specific example, the second memory string MCS2 further includes a second other part selection transistor SGT22. In the following, an example in which the second source side selection transistor SST2 is used as the second other part selection transistor SGT22 will be described.
The second source side selection transistor SST2 is provided on the side opposite to the second drain side selection transistor SDT2 of the second memory cell group MCG2, and includes the second semiconductor layer SEM2. The second source side selection transistor SST2 has a selection gate connected to the first source side selection gate SGS1.
The memory unit MU further includes a second other unit wiring W22. In the following, an example in which the second source line SL2 is used as the second other part wiring W22 will be described.
The second source line SL2 is connected to the second semiconductor layer SEM2 on the side opposite to the second memory cell group MCG2 of the second source side selection transistor SST2. The second source line SL2 functions as the source line SL in the second memory string MCS2.
In the above, the first and second memory transistors MC1A and MC2A are provided four each, but the number of the first and second memory transistors MC1A and MC2A may be plural, and may be arbitrary. is there.
The first semiconductor layer SEM1 and the second semiconductor layer SEM2 need only be electrically separated from each other, and their forms are arbitrary. For example, the first and second semiconductor layers SEM1 and SEM2 are provided on a substrate (for example, a silicon substrate) so as to extend perpendicular to the main surface of the substrate. Further, the first and second semiconductor layers SEM1 and SEM2 may be SOI (Silicon On Insulator) provided on the substrate. In this case, the first and second semiconductor layers SEM1 and SEM2 are It extends in a plane parallel to the main surface of the substrate.
Further, the number of semiconductor layers is arbitrary, and for any integer n of 2 or more, the first to nth semiconductor layers need be electrically separated from each other, and the form of the first to nth semiconductor layers ( For example, the arrangement relationship with the main surface of the substrate) is arbitrary.
Further, the first to nth semiconductor layers are not only provided in a linear shape extending in one direction in both cases perpendicular to and parallel to the main surface of the substrate, but also have a "U-shape", for example. It may be provided in a folded shape such as "W-shaped". In the following, the first and second semiconductor layers SEM1 and SEM2 will be described as an example extending in one direction.
The control unit CTU controls the memory unit MU having such a configuration. In FIG. 1 (a), the control unit CTU is connected to the first drain side selection gate SGD1 and the first bit line BL1 in order to make the figure easier to see, but the control unit CTU has been described above. It is connected to various electrodes and wiring, and controls the potential (voltage) of each.
Here, the erasing operation in the non-volatile semiconductor storage device 101 is an operation of at least one of injection of holes into the charge holding layer of the memory cell MC and extraction of electrons from the charge holding layer. Here, the charge holding layer is a layer that holds charges in the memory cell MC, and includes, for example, a charge storage layer made of an insulating layer, a floating electrode made of a conductive layer, and the like. The charge holding layer is provided, for example, between the channel region of the memory cell MC and the control gate (gate electrode), a tunnel insulating film is provided between the charge holding layer and the channel region, and the electrification holding layer and the control gate. A block insulating film is provided between the and.
(Selective erase operation ER) Hereinafter, the operation of the control unit CTU at the time of selective erasing in the non-volatile semiconductor storage device 101 will be described.
As shown in FIG. 1 (b), the control unit CTU is a selection cell transistor CL1 (in this specific example) of the first memory transistor MC1A (in this specific example, the first to fourth memory cells MC1 to MC4). The following operations are performed during the selective erasing operation ER that performs at least one of injection of holes into the charge holding layer of the third memory cell MC3) and extraction of electrons from the charge holding layer.
The control unit CTU applies the first voltage V1 to the first bit line BL1. As the first voltage V1, for example, a high voltage Vpp is used. The high voltage Vpp is set to, for example, 20 volts (V).
Then, the control unit CTU applies a second voltage V2 lower than the first voltage V1 to the selected cell gate (control gate CG1-3) of the selected cell transistor CL1. As the second voltage V2, for example, 0 volt (0 V, that is, a ground potential, which may be a reference potential) is adopted.
Then, the control unit CTU is a non-selected cell gate (in this example, the first memory cell MC1, the second memory cell MC2, and the fourth memory cell MC4) other than the selected cell transistor CL1. A third voltage V3, which is lower than the first voltage V1 and higher than the second voltage V2, is applied to the control gate CG1-1, the control gate CG1-2, and the control gate CG1-4). As the third voltage V3, for example, an intermediate voltage Vm between the high voltage Vpp and 0V is adopted. The intermediate voltage Vm is set to, for example, 10V.
Then, the control unit CTU applies a fourth voltage V4 having a first voltage V1 or less and a third voltage V3 or more to the first drain side selection gate SGD1 of the first drain side selection transistor SDT1. As the fourth voltage V4, for example, an intermediate voltage Vm is used. In the following, an example in which an intermediate voltage Vm is used as the fourth voltage V4 will be described.
Then, the control unit CTU applies a fifth voltage V5 higher than the second voltage V2 and lower than the third voltage V3 to the second bit line BL2. As the fifth voltage V5, for example, a low voltage Vcc which is higher than the second voltage V2 (0V) and lower than the third voltage V3 (intermediate voltage Vm) is used. The low voltage Vcc is set to, for example, 3V. Alternatively, the control unit CTU may apply a second voltage V2 (0V) to the second bit line BL2.
In this specific example, the first voltage V1 (high voltage Vpp), which is the same voltage as the first bit line BL1, is applied to the first source line SL1. Then, a fourth voltage V4 (intermediate voltage Vm), which is the same voltage as the first drain side selection gate SGD1, is applied to the first source side selection gate SGS1. Further, a fifth voltage V5 (low voltage Vcc) or a second voltage (0V), which is the same voltage as the second bit line BL2, is applied to the second source line SL2.
A second voltage V2 (for example, 0V) is applied to the control gates (control gates CG1-1 to CG1-4) of the 5th to 8th memory cells MC5 to MC8 of the 2nd memory string MCS2. ..
As described above, 0V is applied to the selected cell gate (control gate CG1-3) of the selected cell transistor CL1, and high voltage Vpp is applied to the first bit line BL1 and the first source line SL1, so that the third is At least one of the injection of holes into the charge holding layer of the memory cell MC3 and the extraction of electrons from the charge holding layer is performed, that is, the third memory cell MC3 is erased.
Then, the voltages of the non-selected cell gates (control gate CG1-1, control gate CG1-2 and control gate CG1-4) of the non-selected first memory cell MC1, the second memory cell MC2 and the fourth memory cell MC4 are set to the first. Since the voltage is V3 (intermediate voltage Vm), these cells are not erased.
Further, in the second memory string MCS2 having the same control gate as the first memory string MCS1, low voltage Vcc is applied to the second bit line BL2 and the second source line SL2, so that the fifth, sixth and Erroneous writing in the 8th memory cells MC5, MC6 and MC8 is suppressed, and in the 7th memory cell MC7, which has the same selection gate as the 3rd memory cell MC, the applied voltage is small, so that the erasure is not performed. ..
By setting such a potential relationship (voltage relationship), only the selected cell transistor CL1 is erased, other memory cells (non-selected cell transistors) are not erased, and erroneous writing is prevented. can do. By performing selective erasing by such an operation, the operation reliability of the non-volatile semiconductor storage device 101 can be improved.
When the intermediate voltage Vm is a low voltage at which writing is not performed, as described above, the second bit line BL2 and the second source line SL2 of the non-selected second memory string MCS2 , The second voltage V2 (0V) may be applied.
Further, as shown in FIG. 1A, the memory unit MU further includes a third memory string MCS3.
The third memory string MCS3 has a third memory cell group MCG3 and a third selection transistor SGT31. In the following, an example in which the third drain side selection transistor SDT3 is used as the third selection transistor SGT31 will be described.
The third memory cell group MCG3 includes a plurality of third memory transistors MC3A (memory cell MCs, for example, ninth to twelfth memory cells MC9 to MC12) connected in series. Data can be electrically rewritten in each of the plurality of third memory transistors MC3A.
Each of the plurality of third memory transistors MC3A includes a third semiconductor layer SEM3. The third semiconductor layer SEM3 is electrically separated from the first semiconductor layer SEM1 and the second semiconductor layer SEM2. Each of the plurality of third memory transistors MC3A includes a channel formed in the third semiconductor layer SEM3. Each of the third memory transistors MC3A (9th to 12th memory cells MC9 to MC12) has a second control gate CG2A (control gates CG2-1 to CG2-4).
The third drain side selection transistor SDT3 is provided on one end side of the third memory cell group MCG3. The third drain side selection transistor SDT3 includes the same third semiconductor layer SEM3 as the third memory cell group MCG3. That is, the third drain side selection transistor SDT3 includes a channel formed in the third semiconductor layer SEM3. The third drain side selection transistor SDT3 has a second selection gate SG21. In the following, an example in which the second drain side selection gate SGD2 is used as the second selection gate SG21 will be described. The second drain side selection gate SGD2 is electrically separated from the first drain side selection gate SGD1.
The first bit line BL1 is connected to the third semiconductor layer SEM3 on the side opposite to the third memory cell group MCG3 of the third drain side selection transistor SDT3. That is, one end of the first semiconductor layer SEM1 and one end of the third semiconductor layer SEM3 are commonly connected to the first bit line BL1.
The third memory string MCS3 further includes a third other part selection transistor SGT32 provided on the side opposite to the third drain side selection transistor SDT3 of the third memory cell group MCG3. In the following, an example in which the third source side selection transistor SST3 is used as the third other part selection transistor SGT32 will be described.
The third source side selection transistor SST3 includes a third semiconductor layer SEM3. The third source side selection transistor SST3 has a second other part selection gate SG22. In the following, an example will be described in which the second source side selection gate SGS2 is used as the second other part selection gate SG22.
Then, the first source line SL1 is connected to the third semiconductor layer SEM3 on the side opposite to the third memory cell group MCG3 of the third source side selection transistor SST3. That is, the first source line SL1 functions as the source line SL in the first memory string MCS1 and at the same time functions as the source line SL in the third memory string MCS3.
Then, the control unit CTU further performs the following operations during the selective erasing operation. That is, when the selected cell transistor CL1 of the first memory transistor MC1A is selectively erased, the second control gate CG2A (control gate CG2-1 to CG2-4) of the third memory transistor MC3A is connected to the third voltage V3. Apply a low sixth voltage V6. As the sixth voltage V6, the same as the second voltage V2, for example, 0V can be used.
Then, a seventh voltage V7, which is lower than the third voltage V3, is applied to the second drain side selection gate SGD2 of the third drain side selection transistor SDT3. As the seventh voltage V7, the same as the second voltage V2, for example, 0V can be used.
The first voltage V1 (high voltage Vpp) is applied to the first bit line BL1 connected to the third semiconductor layer SEM3 of the third memory string MCS3, and the fifth voltage V5 is applied to the second bit line BL2. (Low voltage Vcc) or 0V is applied.
As a result, the data of the third memory transistor MC3A (9th to 12th memory cells MC9 to MC12) of the third memory string MCS3 is not rewritten.
Further, as shown in FIG. 1A, the memory unit MU further includes a fourth memory string MCS4.
The fourth memory string MCS4 has a fourth memory cell group MCG4 and a fourth selection transistor SGT41. Hereinafter, an example in which the fourth drain side selection transistor SDT4 is used as the fourth selection transistor SGT41 will be described.
The fourth memory cell group MCG4 includes a plurality of fourth memory transistors MC4A (memory cell MCs, for example, 13th to 16th memory cells MC13 to MC16) connected in series. Data can be electrically rewritten in each of the plurality of fourth memory transistors MC4A.
The plurality of fourth memory transistors MC4A (13th to 16th memory cells MC13 to MC16) include a fourth semiconductor layer SEM4. The fourth semiconductor layer SEM4 is electrically separated from the first semiconductor layer SEM1, the second semiconductor layer SEM2, and the third semiconductor layer SEM3. Each of the plurality of fourth memory transistors MC4A has a channel formed in the fourth semiconductor layer SEM4. Each of the control gates of the plurality of fourth memory transistors MC4A (13th to 16th memory cells MC13 to MC16) is the second control gate of the plurality of third memory transistors MC3A (9th to 12th memory cells MC9 to MC12). It is commonly connected to CG2A (control gates CG2-1 to CG2-4).
The fourth drain side selection transistor SDT4 is provided on one end side of the fourth memory cell group MCG4. The fourth drain side selection transistor SDT4 includes the same fourth semiconductor layer SEM4 as the fourth memory cell group MCG4. That is, the fourth drain side selection transistor SDT4 has a channel formed in the fourth semiconductor layer SEM4. The selection gate of the fourth drain side selection transistor SDT4 is connected to the second drain side selection gate SGD2.
The second bit line BL2 is connected to the fourth semiconductor layer SEM4 on the side opposite to the fourth memory cell group (13th to 16th memory cells MC13 to MC16) of the fourth drain side selection transistor SDT4. .. That is, one end of the second semiconductor layer SEM2 and one end of the fourth semiconductor layer SEM4 are commonly connected to the second bit line BL2.
The fourth memory string MCS4 further includes a fourth other part selection transistor SGT42 provided on the side opposite to the fourth drain side selection transistor SDT4 of the fourth memory cell group MCG4. In the following, an example in which the fourth source side selection transistor SST4 is used as the fourth other part selection transistor SGT42 will be described.
The fourth source side selection transistor SST4 includes a fourth semiconductor layer SEM4. The selection gate of the fourth source side selection transistor SST4 is connected to the second source side selection gate SGS2.
Then, the second source line SL2 is connected to the fourth semiconductor layer SEM4 on the side opposite to the fourth memory cell group MCG4 of the fourth source side selection transistor SST4. That is, the second source line SL2 functions as the source line SL in the second memory string MCS2 and at the same time also functions as the source line SL in the fourth memory string MCS4.
Also in such a fourth memory string MCS4, a sixth voltage V6 (for example, 0V, which is the same as the second voltage V2) is applied to the control gates CG2-1 to CG2-4 common to the third memory string MCS3. Then, a seventh voltage V7 (for example, 0V, which is the same as the second voltage V2) common to the second drain side selection gate SGD2 is applied to the selection gate of the fourth drain side selection transistor SDT4. The second bit line BL2 and the second source line SL2 connected to the fourth semiconductor layer SEM4 of the fourth memory string MCS4 have a fifth voltage V5 (low voltage Vcc) or a second voltage V2 (0V). Has been applied.
As a result, the data of the 4th memory transistor MC4A (13th to 16th memory cells MC13 to MC16) of the 4th memory string MCS4 is not rewritten.
In this way, only the selected cell transistor CL1 can be selectively erased, and the operational reliability of the non-volatile semiconductor storage device 101 can be improved.
(Write operation WR) Hereinafter, the operation of the control unit CTU at the time of writing in the non-volatile semiconductor storage device 101 will be described. The writing operation is an operation of at least one of injecting electrons into the charge holding layer of the memory cell MC and extracting holes from the charge holding layer.
The control unit CTU is used during the write operation WR of the selected cell transistor CL1 (3rd memory cell MC3 in this example) of the 1st memory transistor MC1A (1st to 4th memory cells MC1 to MC4 in this example). In addition, the following operations are performed.
As shown in FIG. 1 (b), the control unit CTU applies a high voltage Vpp (for example, the above-mentioned first voltage V1) to the selected cell gate (CG1-3) of the selected cell transistor CL1. Then, 0 V (for example, a second voltage V2 lower than the first voltage V1 described above) is applied to the first bit line BL1. Then, the non-selected cell gates (control gate CG1-1, control gate CG1-2 and control) of the first memory transistor MC1A (first memory cell MC1, second memory cell MC2 and fourth memory cell MC4) other than the selected cell transistor CL1 are used. A low voltage (for example, low voltage Vcc) higher than the second voltage V2 and lower than the third voltage V3 is applied to the gate CG1-4). Then, a low voltage (for example, low voltage Vcc) higher than the second voltage V2 and lower than the third voltage V3 is applied to the first drain side selection gate SGD1 of the first drain side selection transistor SDT1. Then, a low voltage (for example, low voltage Vcc) higher than the second voltage V2 and lower than the third voltage V3 is applied to the second bit line BL2.
As a result, writing can be selectively performed to the selection cell transistor CL1.
The control unit CTU can further perform the following operations during the write operation WR. 0V (for example, the second voltage V2) is applied to the first source line SL1 and the second source line SL2. Also, 0V (for example, the second voltage V2) is applied to the first source side selection gate SGS1 of the first memory string MCS1.
Then, during the write operation WR, the control unit CTU further controls the second control gate CG2A (control gate CG2-1 to CG2-4) of the third memory transistor MC3A (9th to 12th memory cells MC9 to MC12). 0V (for example, a voltage lower than the above-mentioned third voltage V3, for example, a second voltage V2) is applied to. Then, a voltage lower than the third voltage V3 (for example, 0V) is applied to the second drain side selection gate SGD2 of the third drain side selection transistor SDT3. A voltage lower than the third voltage (for example, 0V) is applied to the second source side selection gate SGS2 of the third memory string MCS3.
As a result, it is possible to prevent erroneous writing of the third memory transistor MC3A (9th to 12th memory cells MC9 to MC12) of the third memory string MCS3.
In the 4th memory string MCS4, the same voltage (0V) as that of the 2nd drain side selection gate SGD2 is applied to the selection gate of the 4th drain side selection transistor SDT4, and the selection gate of the 4th source side selection transistor SST4. The same voltage (0V) as that of the second source side selection gate SGS2 is applied to. As a result, erroneous writing of the fourth memory transistor MC4A (13th to 16th memory cells MC13 to MC16) of the fourth memory string MCS4 can be prevented.
(Read operation RD) Hereinafter, the operation of the control unit CTU during the read operation RD in the non-volatile semiconductor storage device 101 will be described. As shown in Fig. 1 (b), the control unit CTU is on the 1st bit line BL1 at the time of reading, which is lower than the 5th voltage V5 (for example, low voltage Vcc) and higher than the 2nd voltage V2 (for example, 0V). A bit line voltage Ve is applied. The bit line voltage Ve at the time of reading can be, for example, 1V to 2V.
Then, a detection voltage Vse that can be changed between the low voltage Vcc and the second voltage V2 (for example, 0V) is applied to the selection cell gate (CG1-3) of the selection cell transistor CL1. The detection voltage Vse is the voltage of the electric signal for detecting the threshold voltage of the memory cell MC.
Then, the non-selected cell gates (control gate CG1-1, control gate CG1-2 and control) of the first memory transistor MC1A (first memory cell MC1, second memory cell MC2 and fourth memory cell MC4) other than the selected cell transistor CL1 are used. Apply low voltage Vcc to gate CG1-4). Then, a low voltage Vcc is applied to the first drain side selection gate SGD1 of the first drain side selection transistor SDT1. Then, a second voltage V2 (for example, 0V) is applied to the second bit line BL2.
As a result, the data written in the memory cell MC can be read without erroneously writing in the memory cell MC of the first memory string MCS1.
The control unit CTU can further perform the following operations during the read operation RD. A second voltage V2 (for example, 0V) is applied to the first source line SL1 and the second source line SL2. Further, for example, a low voltage Vcc is applied to the first source side selection gate SGS1 of the first memory string MCS1.
Then, the control unit CTU further applies, for example, 0V to the second control gate CG2A (control gate CG2-1 to CG2-4) of the third memory transistor MC3A (9th to 12th memory cells MC9 to MC12). .. Then, for example, 0V is applied to the second drain side selection gate SGD2 of the third drain side selection transistor SGT3. Note that 0V is also applied to the second source side selection gate SGS2 of the third memory string MCS3.
As a result, it is possible to prevent erroneous writing of the third memory transistor MC3A (9th to 12th memory cells MC9 to MC12) of the third memory string MCS3.
In the 4th memory string MCS4, 0V, which is the same voltage as the 2nd drain side selection gate SGD2, is applied to the selection gate of the 4th drain side selection transistor SDT4, and 0V, which is the same voltage as the 2nd drain side selection gate SGD2, is applied to the selection gate of the 4th memory string MCS4. 0V, which is the same voltage as the second source side selection gate SGS2, is applied. As a result, erroneous writing of the fourth memory transistor MC4A (13th to 16th memory cells MC13 to MC16) of the fourth memory string MCS4 can be prevented.
(First Example) Hereinafter, the non-volatile semiconductor storage device 110 of the first embodiment according to the first embodiment will be described. 2, FIG. 3 and FIG. 4 are a schematic perspective view, a schematic cross-sectional view, and a schematic partial cross-sectional view, respectively, illustrating the configuration of the non-volatile semiconductor storage device according to the first embodiment. In FIG. 2, only the conductive portion is shown and the insulating portion is omitted in order to make the figure easier to see.
As shown in FIGS. 2 and 3, the non-volatile semiconductor storage device 110 according to the present embodiment includes a memory unit MU and a control unit CTU. These memory unit MU and control unit CTU are provided on the main surface 11a of the substrate 11 made of, for example, single crystal silicon. However, the control unit CTU may be provided on a board different from the board on which the memory unit MU is provided. Hereinafter, a case where the memory unit MU and the control unit CTU are provided on the same substrate (board 11) will be described.
On the substrate 11, for example, a memory array area MR in which a memory cell is provided and a peripheral area PR provided in the periphery of the memory array area MR are set. In the peripheral area PR, various peripheral area circuits PR1 are provided on the substrate 11.
In the memory array area MR, for example, the circuit unit CU is provided on the substrate 11, and the memory unit MU is provided on the circuit unit CU. The circuit unit CU is provided as needed and can be omitted. An interlayer insulating film 13a made of, for example, silicon oxide is provided between the circuit section CU and the memory section MU.
For example, at least a part of the control unit CTU can be provided in at least one of the peripheral region circuit PR1 and the circuit unit CU described above, for example.
The memory unit MU includes a matrix memory cell unit MU1 having a plurality of memory transistors and a wiring connection unit MU2 for connecting the wiring of the matrix memory cell unit MU1.
FIG. 2 illustrates the configuration of the matrix memory cell unit MU1. In FIG. 3, a part of the A-A'cross section of FIG. 2 and a part of the B-B' line cross section of FIG. 2 are illustrated as the matrix memory cell portion MU1.
As shown in FIGS. 2 and 3, in the matrix memory cell portion MU1, the laminated structure ML is provided on the main surface 11a of the substrate 11. The laminated structure ML has a plurality of electrode films WL and a plurality of inter-electrode insulating films 14 alternately laminated in a direction perpendicular to the main surface 11a.
Here, for convenience of explanation, the direction perpendicular to the main surface 11a of the substrate 11 is defined as the Z-axis direction (first direction). Then, one direction in the plane parallel to the main surface 11a is defined as the Y-axis direction (second direction). Then, the direction perpendicular to the Z-axis and the Y-axis is defined as the X-axis direction (third direction).
The stacking direction of the electrode film WL and the inter-electrode insulating film 14 in the laminated structure ML is the Z-axis direction. That is, the electrode film WL and the inter-electrode insulating film 14 are provided parallel to the main surface 11a. The electrode film WL is divided in units of erase blocks, for example.
FIG. 4 illustrates the configuration of the matrix memory cell unit MU1 and corresponds to, for example, a part of the B-B'line cross section of FIG. As shown in FIGS. 3 and 4, the memory unit MU of the non-volatile semiconductor storage device 110 includes the above-mentioned laminated structure ML and the semiconductor pillar SP (first semiconductor pillar) penetrating the laminated structure ML in the Z-axis direction. It has SP1), a storage layer 48, an inner insulating film 42, and an outer insulating film 43.
The storage layer 48 is provided between each of the electrode film WL and the semiconductor pillar SP. The inner insulating film 42 is provided between the storage layer 48 and the semiconductor pillar SP. The outer insulating film 43 is provided between each of the electrode films WL and the storage layer 48.
That is, the outer insulating film 43, the storage layer 48, and the inner insulating film 42 are formed in this order on the inner wall surface of the through hole TH penetrating the laminated structure ML in the Z-axis direction, and the semiconductor is embedded in the remaining space. Then, the semiconductor pillar SP is formed.
A memory cell MC is provided at the intersection of the electrode film WL of the laminated structure ML and the semiconductor pillar SP. That is, at the intersection of the electrode film WL and the semiconductor pillar SP, memory transistors having a storage layer 48 are provided in a three-dimensional matrix, and by accumulating charges in the storage layer 48, each memory transistor can be used for data. Functions as a memory cell MC that stores. The semiconductor pillar SPs are the first to fourth semiconductor layers SEM1 to SEM4. The memo cell transistors formed in the semiconductor pillar SP are the first to fourth memory cell groups MCG1 to MCG4.
The inner insulating film 42 functions as a tunnel insulating film in the memory transistor of the memory cell MC. On the other hand, the outer insulating film 43 functions as a block insulating film in the memory transistor of the memory cell MC. The inter-electrode insulating film 14 functions as an interlayer insulating film that insulates the electrode films WL from each other.
Any conductive material can be used for the electrode film WL, for example, amorphous silicon or polysilicon to which impurities have been introduced to impart conductivity can be used, and metals and alloys can also be used. it can. A predetermined electric signal is applied to the electrode film WL, and the electrode film WL functions as a word line of the non-volatile semiconductor storage device 110.
For the inter-electrode insulating film 14, the inner insulating film 42, and the outer insulating film 43, for example, a silicon oxide film can be used. The inter-electrode insulating film 14, the inner insulating film 42, and the outer insulating film 43 may be a single-layer film or a laminated film.
For the storage layer 48, for example, a silicon nitride film can be used, and an electric field applied between the semiconductor pillar SP and the electrode film WL functions as a portion for storing or releasing electric charges and storing information. The storage layer 48 may be a single-layer film or a laminated film.
As will be described later, any material can be used for the inter-electrode insulating film 14, the inner insulating film 42, the storage layer 48, and the outer insulating film 43, not limited to the materials exemplified above.
In addition, in FIGS. 2 and 3, the case where the laminated structure ML has four layers of the electrode film WL is exemplified, but the number of the electrode film WL provided in the laminated structure ML is arbitrary. .. Hereinafter, a case where the number of electrode films WL is four will be described.
Then, the selection gate SG is provided at the upper part and the lower part of the laminated structure ML. That is, an upper selection gate USG (for example, a drain side selection gate) is provided above the laminated structure ML, and a lower selection gate LSG (for example, a source side selection gate) is provided below the laminated structure ML. There is.
An upper selection gate insulating film USGI made of, for example, silicon oxide is provided between the upper selection gate USG and the semiconductor pillar SP, and a lower selection made of, for example, silicon oxide is provided between the lower selection gate LSG and the semiconductor pillar SP. A gate insulating film LSGI is provided.
A source line SL is provided below the lower selection gate LSG. An interlayer insulating film 13a is provided below the source line SL, and an interlayer insulating film 13b is provided between the source line SL and the lower selection gate LSG.
Below the lower selection gate LSG, the semiconductor pillar SP is connected to the source line SL, and above the upper selection gate USG, the semiconductor pillar SP is connected to the bit line BL.
The upper selection gate USG and the lower selection gate LSG are divided in the Y-axis direction by the interlayer insulating film 17 and the interlayer insulating film 13c, respectively, and have a band-like shape extending along the X-axis direction.
Any conductive material can be used for the above-mentioned selection gate SG (upper selection gate USG and lower selection gate LSG), and for example, polysilicon or amorphous silicon can be used.
On the other hand, the bit line BL connected to the upper part of the semiconductor pillar SP and the source line SL connected to the lower part of the semiconductor pillar SP have a band-like shape extending in the Y-axis direction. In this case, the electrode film WL is a plate-shaped conductive film parallel to the XY plane.
One of the upper selection gates USG becomes the first drain side selection gate SGD1, and another of the upper selection gates USG becomes the second drain side selection gate SGD2. Then, one of the lower selection gates LSG becomes the first source side selection gate SGS1, and another one of the lower selection gates LSG becomes the second source side selection gate SGS2.
Then, the first drain side selection transistor SDT1 is provided at the intersection of the first semiconductor pillar SP1 and the first drain side selection gate SGD1, and the second is at the intersection of the second semiconductor pillar SP2 and the first drain side selection gate SGD1. The drain side selection transistor SDT2 is provided, the third drain side selection transistor SDT3 is provided at the intersection of the third semiconductor pillar SP3 and the second drain side selection gate SGD2, and the fourth semiconductor pillar SP4 and the second drain side selection gate SGD2 are provided. The fourth drain side selection transistor SDT4 is provided at the intersection with the above.
Then, the first to fourth memory strings MCS1 to MCS4 are formed based on the first to fourth semiconductor pillars SP1 to SP4.
In the non-volatile semiconductor storage device 110, the control unit CTU performs the operation illustrated in FIG. 1B, so that the selective erasing operation ER can be performed and the operation reliability can be improved. Further, the write operation WR and the read operation RD illustrated in FIG. 1 (b) can be performed to carry out the desired operation.
In the non-volatile semiconductor storage device 110, semiconductor pillars SP are used as the first to fourth semiconductor layers SEM1 to SEM4, and the first to fourth semiconductor layers SEM1 to SEM4 are used with respect to the main surface 11a of the substrate 11. As an example of extending in the vertical direction, as the first to fourth semiconductor layers SEM1 to SEM4, for example, SOI extending in the direction parallel to the main surface 11a of the substrate 11 is used. You may.
(Second embodiment) FIG. 5 is a schematic diagram illustrating the configuration of the non-volatile semiconductor storage device according to the second embodiment. That is, the figure is a circuit diagram illustrating the configuration of the non-volatile semiconductor storage device 102. In FIG. 5, some wirings are omitted to make the figure easier to see. FIG. 6 is a table illustrating the operation of the non-volatile semiconductor storage device according to the second embodiment.
As shown in FIG. 5, the non-volatile semiconductor storage device 102 according to the present embodiment is each of the memory strings (first to fourth memory strings MCS1 to MCS4) of the non-volatile semiconductor storage device 101 illustrated in FIG. Connection transistor CPTs (1st to 4th connection transistors CPT1 to CPT4) are provided in the middle. Then, each memory string has, for example, a folded structure.
In the non-volatile semiconductor storage device 102, the memory unit MU includes the first memory string MCS1, the first bit line BL1, the second memory string MCS2, the second bit line BL2, and the first source. It has a line SL1 and a second source line SL2.
The first memory string MCS1 includes the first memory cell group MCG1, the first drain side selection transistor SDT1, the first other part memory cell group MCH1, the first source side selection transistor SST1, and the first. It also has one connection transistor CPT1 and.
The first source side selection transistor SST1 is provided on the side opposite to the first drain side selection transistor SDT1 of the first memory cell group MCG1. The first source side selection transistor SST1 includes a channel formed in the first semiconductor layer SEM1 and has a first source side selection gate SGS1.
The first connection transistor CPT1 is provided between the first memory cell group MCG1 and the first source side selection transistor SST1, includes a channel formed in the first semiconductor layer SEM1, and has a first connection gate CPG1. .. In the following, an example in which the first back gate BG1 is used as the first connection gate CPG1 will be described.
The first other part memory cell group MCH1 is provided between the first source side selection transistor SST1 and the first connection part transistor CPT1 and is connected in series to a plurality of first other part memory transistors MC1B (memory cell MC). Has. As described above, the first memory cell group MCG1 includes the first memory transistor MC1A (memory cell MC).
Each of the plurality of first other part memory transistors MC1B includes a channel formed in the first semiconductor layer SEM1 and has a first other part control gate CG1B (control gate CG1 / 2-5 to CG1 / 2-8). However, the data can be rewritten electrically.
The first source line SL1 is connected to the first semiconductor layer SEM1 on the side opposite to the first other part memory cell group MCH1 of the first source side selection transistor SST1.
In the present embodiment, the first control gate CG1A of the first memory cell group MCG1 is the control gates CG0 / 1-1 to CG0 / 1-4.
The second memory string MCS2 includes the second memory cell group MCG2, the second drain side selection transistor SDT2, the second other part memory cell group MCH2, the second source side selection transistor SST2, and the second memory string MCS2. It also has a two-connection transistor CPT2.
The second source side selection transistor SST2 is provided on the side opposite to the second drain side selection transistor SDT2 of the second memory cell group MCG2, includes a channel formed in the second semiconductor layer SEM2, and is selected on the second source side. Has gate SGS2.
The second connection transistor CPT2 is provided between the second memory cell group MCG2 and the second source side selection transistor SST2, includes a channel formed in the second semiconductor layer SEM2, and is electrically connected to the first backgate BG1. Has a connection gate connected to.
The second other part memory cell group MCH2 is provided between the second source side selection transistor SST2 and the second connection part transistor CPT2, and a plurality of second other part memory transistors MC2B (memory cell MC) connected in series. Have. As described above, the second memory cell group MCG2 includes the second memory transistor MC2A (memory cell MC).
Each of the plurality of second other part memory transistors MC2B includes a channel formed in the second semiconductor layer SEM2, has a control gate electrically connected to the first other part control gate CG1B, and electrically performs data. Can be rewritten.
The second source line SL2 is connected to the second semiconductor layer SEM2 on the side opposite to the second other part memory cell group MCH2 of the second source side selection transistor SST2.
(Selective erase operation ER) Hereinafter, the operation of the control unit CTU at the time of selective erasing in the non-volatile semiconductor storage device 102 will be described.
The control unit CTU performs the following operations during the selective erasing operation ER in the charge holding layer of the selective cell transistor CL1 of the first memory transistor MC1A (memory cell MC belonging to the first memory cell group MCG1). The selection cell transistor CL1 has a control gate CG1-3.
That is, as shown in FIG. 6, the control unit CTU applies the first voltage V1 (high voltage Vpp, for example, 20 V) to the first bit line BL1. Then, a second voltage V2 (for example, 0V) lower than the first voltage V1 is applied to the selection cell gate (control gate CG0 / 1-3) of the selection cell transistor CL1. Then, at the non-selected cell gates (control gate CG0 / 1-1, control gate CG0 / 1-2 and control gate CG0 / 1-4) of the first memory transistor MC1A other than the selected cell transistor CL1, at the first voltage V1 or less. A third voltage V3 (intermediate voltage Vm between the high voltage Vpp and 0V, for example 10V), which is higher than the second voltage V2, is applied. Then, a fourth voltage V4 (for example, an intermediate voltage Vm) having a first voltage V1 or less and a third voltage V3 or more is applied to the first drain side selection gate SGD1 of the first drain side selection transistor SDT1. Then, a fifth voltage V5 (for example, a low voltage Vcc) higher than the second voltage V2 and lower than the third voltage V3 is applied to the second bit line BL2. As described above, the second voltage V2 (for example, 0V) may be applied to the second bit line BL2.
Further, the control unit CTU applies a fifth voltage V5 (low voltage Vcc) or a second voltage (0V) to the first source line SL1. Then, a third voltage V3 (intermediate voltage Vm) is applied to the first other part control gate CG1B. Then, an eighth voltage V8 lower than the third voltage V3 is applied to the first source side selection gate SGS1. As the eighth voltage V8, for example, the second voltage (0V) can be used. Then, a ninth voltage V9, which is lower than the first voltage V1 (high voltage Vpp) and higher than the second voltage V2 (0V), is applied to the first back gate BG1. As the ninth voltage V9, for example, an intermediate voltage Vm can be used. Then, the second voltage V2 (0V) is applied to the second source line SL2, and the sixth voltage V6 (0V) is applied to the second control gate CG2A (control gate CG2 / 3-1 to control gate CG2 / 3-4). Apply, apply the 8th voltage V8 to the 2nd drain side selection gate SGD2, and apply the 8th voltage V8 to the 2nd source side selection gate SGS2.
Due to this voltage relationship<u style="single">, Selection</u>Positive charges are injected or electrons are emitted into the charge holding layer of the selective cell transistor CL1, that is, erasure is performed. That is, the threshold voltage of the selected cell transistor CL1 becomes lower than 0V.
In the non-selected memory cells of the memory cell group including the selected cell transistor CL1 (in this case, the first memory cell group MCG1), an intermediate voltage Vm (for example, 10V) is applied to the control gate, so that the voltage is applied. Since the electric field is low, it cannot be erased.
On the other hand, in the memory string adjacent to the memory string including the selection cell transistor CL1 and the control gate and the selection gate, the second bit line BL2 is set to the fifth voltage V5 (3V of low voltage Vcc). , Or by applying a second voltage (0V), the electric field applied to the non-selected memory cells of these memory strings is low, so erroneous writing does not occur.
In addition, the memory string to which the 1st bit line BL1 is commonly connected is cut off when the selection gate SG (2nd drain side selection gate SGD2 and 2nd source side selection gate SGS2) is set to 0V of the 7th voltage V7. By doing so, erasure does not occur.
In addition, in the control gate common to the first other part memory cell group MCH1 of the selected memory string (first memory string MCS1) (control gate CG1 / 2-5 to CG1 / 2-8 of the first other part control gate CG1B) Since an intermediate voltage Vm (for example, 10V) is applied and the applied electric field is low, erroneous writing occurs in the memory cell MC (memory cell included in the second other part memory cell group MCH2) corresponding to this control gate. Absent.
Further, as shown in FIG. 5, similarly to the first memory string MCS1, the third memory string MCS3 includes the third memory cell group MCG3, the third drain side selection transistor SDT3, and the third other. It further has a part memory cell group MCH3, a third source side selection transistor SST3, and a third connection part transistor CPT3. Similarly, the fourth memory string MCS4 includes the fourth memory cell group MCG4, the fourth drain side selection transistor SDT4, the fourth other part memory cell group MCH4, and the fourth source side selection transistor SST4. And a fourth connection transistor CPT4.
The configurations of the third and fourth memory cell groups MCG3 and MCG4, and the third and fourth source side selection transistors SST3 and SST4 are the same as those of the first and second memory strings MCS1 and MCS2, so the description is omitted. To do.
The control gates of the third and fourth memory cell groups MCG3 and MCG4 are connected to the first and second control gates CG1A and CG2A of the first and second memory cell groups MCG1 and MCG2, respectively. Further, the control gates of the third and fourth other part memory cell groups MCH3 and MCH4 are connected to the first other part control gate CG1B of the first and second other part memory cell groups MCH1 and MCH2.
The control gates of the third and fourth drain side selection transistors SDT3 and SDT4 are connected to the first and second drain side selection gates SGD1 and SGD2 of the first and second drain side selection transistors SDT1 and SDT2, respectively. .. Further, the control gates of the third and fourth source side selection transistors SST3 and SST4 are connected to the first and second source side selection gates SGS1 and SGS2 of the first and second source side selection transistors SST1 and SST2, respectively. ..
The third connection transistor CPT3 is provided between the third memory cell group MCG3 and the third source side selection transistor SST3, includes a channel formed in the third semiconductor layer SEM3, and has a second connection gate CPG2. .. In the following, an example in which the second back gate BG2 is used as the second connection gate CPG2 will be described.
The fourth connection transistor CPT4 is provided between the fourth memory cell group MCG4 and the fourth source side selection transistor SST4, includes a channel formed in the fourth semiconductor layer SEM4, and is connected to the second connection gate CPG2. Has a selected gate.
When the non-volatile semiconductor storage device 102 has the third and fourth memory strings MCS3 and MCS4 having such a configuration, the control unit CTU includes the first memory transistor MC1A (memory cell MC belonging to the first memory cell group MCG1). ), The control unit CTU further applies a second voltage (0V) to the second back gate BG2 during the selective erasing operation ER of the selective cell transistor CL1.
Due to the above voltage relationship, erroneous writing of the third and fourth memory strings MCS3 and MCS4 is suppressed, and the desired selected transistor (in this case, the selected cell transistor CL1 belonging to the first memory transistor MC1A) is selectively erased. be able to.
(Write operation WR) Hereinafter, the operation of the control unit CTU during the write operation WR in the non-volatile semiconductor storage device 102 will be described.
During the write operation WR in the selected cell transistor CL1 of the first memory transistor MC1A, the control unit CTU performs the following operations.
That is, the control unit CTU applies the second voltage V2 (0V) to the first bit line BL1. Then, the first voltage V1 (high voltage Vpp) is applied to the selected cell gate (control gate CG0 / 1-3) of the selected cell transistor CL1.
Then, the fifth voltage V5 (for example, control gate CG0 / 1-1, control gate CG0 / 1-2, and control gate CG0 / 1-4) of the first memory transistor MC1A other than the selection cell transistor CL1 is connected. Apply low voltage Vcc). Then, a fifth voltage V5 (low voltage Vcc) is applied to the first drain side selection gate SGD1. Then, a fifth voltage V5 (low voltage Vcc) is applied to the second bit line BL2.
Further, the control unit CTU applies a second voltage V2 (0V) to the first source line SL1. Then, the fifth voltage V5 (low voltage Vcc) is applied to the first other part control gate CG1B. Then, a second voltage V2 (0V) is applied to the first source side selection gate SGS1. Then, a fifth voltage V5 (low voltage Vcc) is applied to the first back gate BG1. Then, a second voltage V2 (0V) is applied to the second source line SL2. Then, the second voltage V2 (0V) is applied to the second control gate CG2A (control gate CG2 / 3-1 to control gate CG2 / 3-4). Then, a second voltage V2 (0V) is applied to the second drain side selection gate SGD2. Then, the second voltage V2 (0V) is applied to the second source side selection gate SGS2. Further, a second voltage (0V) is applied to the second back gate BG2.
As a result, it is possible to write to the desired selection transistor (in this case, the selection cell transistor CL1 belonging to the first memory transistor MC1A).
(Read operation RD) Further, the operation of the control unit CTU at the time of the read operation RD in the non-volatile semiconductor storage device 102 will be described.
The control unit CTU performs the following operations during the read operation RD of the selected cell transistor CL1 of the first memory transistor MC1A.
That is, the control unit CTU applies a read-time bit line voltage Ve, which is lower than the fifth voltage V5 (for example, low voltage Vcc) and higher than the second voltage V2 (for example, 0V), to the first bit line BL1. The bit line voltage Ve at the time of reading can be, for example, 1V to 2V. Then, the detection voltage Vse is applied to the selected cell gate (control gate CG0 / 1-3) of the selected cell transistor CL1. Then, the fifth voltage V5 (low) is applied to the non-selected cell gates (control gate CG0 / 1-1, control gate CG0 / 1-2 and control gate CG0 / 1-4) of the first memory transistor MC1A other than the selected cell transistor CL1. Apply voltage Vcc). Then, a fifth voltage V5 (low voltage Vcc) is applied to the first drain side selection gate SGD1. Then, the second voltage V2 (0V) is applied to the second bit line BL2.
Further, the control unit CTU applies a second voltage V2 (0V) to the first source line SL1. Then, the fifth voltage V5 (low voltage Vcc) is applied to the first other part control gate CG1B. Then, a fifth voltage V5 (Vcc) is applied to the first source side selection gate SGS1. Then, a fifth voltage V5 (low voltage Vcc) is applied to the first back gate BG1. Then, a second voltage V2 (0V) is applied to the second source line SL2. Then, the second voltage V2 (0V) is applied to the second control gate CG2A (control gate CG2 / 3-1 to control gate CG2 / 3-4). Then, a second voltage V2 (0V) is applied to the second drain side selection gate SGD2. Then, the second voltage V2 (0V) is applied to the second source side selection gate SGS2. Further, a second voltage (0V) is applied to the second back gate BG2.
As a result, the information stored in the desired selection transistor (in this case, the selection cell transistor CL1 belonging to the first memory transistor MC1A) can be read out.
Further, as shown in FIG. 5, when the selected memory cells are the selected cell transistors CL2, CL3 and CL4 belonging to the second, third and fourth memory strings MCS2, MCS3 and MCS4, respectively, as shown in FIG. By using the voltage under the illustrated conditions, the selective erasing operation ER can be performed. That is, depending on the position of the selected memory cell, for example, the first memory cell group MCG1, the first other part memory cell group MCH1, the second memory cell group MCG2, the second other part memory cell group MCH2, the third memory cell group, the first 3 It is considered that the positions of the other part memory cell group, the fourth memory cell group, the fourth other part memory cell group, etc. change, and the positions of each wiring, each selection gate, each control gate, and each connection part gate are changed. , The desired memory cell MC can be selectively erased by the same operation. Further, in the same manner, the write operation WR and the read operation RD can be performed.
(Second Example) Hereinafter, the non-volatile semiconductor storage device 120 of the second embodiment according to the second embodiment will be described. 7 and 8 are a schematic perspective view and a schematic cross-sectional view, respectively, illustrating the configuration of the non-volatile semiconductor storage device according to the second embodiment. In FIG. 7, only the conductive portion is shown and the insulating portion is omitted in order to make the figure easier to see.
As shown in FIGS. 7 and 8, in the non-volatile semiconductor storage device 120 according to the present embodiment, two semiconductor pillars SP described with respect to the first embodiment are connected by a connection portion CP. That is, the memory unit MU further includes a second semiconductor pillar SP2 (semiconductor pillar SP) and a first connection unit CP1 (connection unit CP) in addition to the first semiconductor pillar SP1.
The second semiconductor pillar SP2 is adjacent to the first semiconductor pillar SP1 (semiconductor pillar SP) in the Y-axis direction, for example, and penetrates the laminated structure ML in the Z-axis direction. The first connection portion CP1 electrically connects the first semiconductor pillar SP1 and the second semiconductor pillar SP2 on the same side (the side of the substrate 11) in the Z-axis direction. The first connection portion CP1 is provided so as to extend in the Y-axis direction. The same material as the first and second semiconductor pillars SP1 and SP2 is used for the first connection portion CP1.
That is, a back gate BG (connecting portion conductive layer) is provided on the main surface 11a of the substrate 11 via the interlayer insulating film 13. A groove is provided in the portion of the first back gate BG1 (back gate BG) facing the first and second semiconductor pillars SP1 and SP2, and the outer insulating film 43, the storage layer 48, and the inner insulating film are provided inside the groove. 42 is formed, and a connection portion CP made of a semiconductor is embedded in the remaining space. The outer insulating film 43, the storage layer 48, the inner insulating film 42, and the connecting portion CP in the groove are formed at the same time as the outer insulating film 43, the storage layer 48, the inner insulating film 42, and the semiconductor pillar SP are formed in the through hole TH. , It is done in a lump. In this way, the back gate BG is provided so as to face the connection portion CP.
That is, the first connection portion CP1 and the first backgate BG1 form the first connection portion transistor CPT1 illustrated in FIG.
As a result, the first and second semiconductor pillars SP1 and SP2 and the connection portion CP form a U-shaped semiconductor pillar, which becomes a U-shaped memory string. As illustrated in FIG. 8, the electrode film WL between the first and second semiconductor pillars SP1 and SP2 is separated by the insulating layer IL.
As shown in FIGS. 7 and 8, the end of the first semiconductor pillar SP1 opposite to the first connection portion CP1 is connected to the bit line BL (first bit line BL1), and the second semiconductor pillar SP1 has a second end. 1 The end opposite to the connection part CP1 is connected to the source line SL (first source line SL1). The semiconductor pillar SP and the bit line BL are connected by via VA1 and via VA2.
In this specific example, the bit line BL extends in the Y-axis direction, and the source line SL extends in the X-axis direction.
Then, between the laminated structure ML and the bit wire BL, the first drain side selection gate SGD1 is provided facing the first semiconductor pillar SP1 and facing the second semiconductor pillar SP2 on the first source side. A selection gate SGS1 is provided.
Further, a third semiconductor pillar SP3, a fourth semiconductor pillar SP4, and a second connection portion CP2 (connection portion CP) are provided.
The third semiconductor pillar SP3 is adjacent to the second semiconductor pillar SP2 on the side opposite to the first semiconductor pillar SP1 of the second semiconductor pillar SP2 in the Y-axis direction, and penetrates the laminated structure ML in the Z-axis direction. The fourth semiconductor pillar SP4 is adjacent to the third semiconductor pillar SP3 on the side opposite to the second semiconductor pillar SP2 of the third semiconductor pillar SP3 in the Y-axis direction, and penetrates the laminated structure ML in the Z-axis direction.
The second connection portion CP2 electrically connects the third semiconductor pillar SP3 and the fourth semiconductor pillar SP4 on the same side in the Z-axis direction (the same side as the first connection portion CP1). The second connection portion CP2 is provided extending in the Y-axis direction and faces the first back gate BG1.
The storage layer 48 is also provided between the electrode film WL and the third and fourth semiconductor pillars SP3 and SP4, and between the back gate BG and the second connection portion CP2. The inner insulating film 42 is also provided between the third and fourth semiconductor pillars SP3 and SP4 and the storage layer 48, and also between the storage layer 48 and the second connection portion CP2. The outer insulating film 43 is also provided between each of the electrode films WL and the storage layer 48, and also between the storage layer 48 and the back gate BG.
Then, the source line SL is connected to the third end portion on the side opposite to the second connection portion CP2 of the third semiconductor pillar SP3. Then, the bit line BL is connected to the fourth end portion on the side opposite to the second connection portion CP2 of the fourth semiconductor pillar SP4.
Then, the second source side selection gate SGS2 is provided facing the third semiconductor pillar SP3, and the second drain side selection gate SGD2 is provided facing the fourth semiconductor pillar SP4.
Any conductive material can be used for the selection gate SG (first and second drain side selection gates SGD1 and SGD2, and first and second source side selection gates SGS1 and SGS2), for example polysilicon or amorphous. Silicon can be used. In this specific example, the selection gate SG has a band-like shape that is divided in the Y-axis direction and extends along the X-axis direction.
Here, with respect to a plurality of semiconductor pillars provided in the non-volatile semiconductor storage device 120, when referring to the entire semiconductor pillar or an arbitrary semiconductor pillar, it is referred to as "semiconductor pillar SP", and the relationship between the semiconductor pillars will be described. In some cases, when referring to a specific semiconductor pillar, it is referred to as "nth semiconductor pillar SPn" (n is an arbitrary integer of 1 or more). Similarly, regarding the connection part, it will be referred to as "nth connection part CPn".
The 1st and 2nd semiconductor pillars SP1 and SP2 and the 1st connection part CP1 correspond to the 1st semiconductor layer SEM1, and the 3rd and 4th semiconductor pillars SP3 and SP4 and the 3rd connection part CP1 correspond to the 2nd semiconductor layer SEM2. Corresponds to.
In addition, the 5th to 8th semiconductor pillars SP5 to SP8 and the 3rd and 4th connections adjacent to the 1st to 4th semiconductor pillars SP1 to SP4 and the 1st and 2nd connection portions CP1 and CP2 in the X-axis direction. Part CP3 and CP4 are provided, and the 5th and 6th semiconductor pillars SP5 and SP6 and the 3rd connection part CP3 correspond to the 3rd semiconductor layer SEM3, and the 7th and 8th semiconductor pillars SP7 and SP8 and the 4th connection part. CP4 corresponds to the fourth semiconductor layer SEM4. The third and fourth connection portions CP3 and CP4 are provided so as to extend in the Y-axis direction and face the second back gate BG2 which extends parallel to the first back gate BG1.
As shown in FIG. 8, an interlayer insulating film 15 is provided on the uppermost portion (the side farthest from the substrate 11) of the laminated structure ML. An interlayer insulating film 16 is provided on the laminated structure ML, a selection gate SG is provided on the interlayer insulating film 16, and an interlayer insulating film 17 is provided between the selection gates SG. A through hole TH is provided in the selection gate SG, a selection gate insulating film SGI of the selection transistor is provided on the inner surface thereof, and a semiconductor is embedded inside the selection gate insulating film SGI. This semiconductor is included in the semiconductor pillar SP.
Then, an interlayer insulating film 18 is provided on the interlayer insulating film 17, a source line SL and vias 22 (vias VA1 and VA2) are provided on the interlayer insulating film 18, and an interlayer insulating film 19 is provided around the source line SL. Has been done. An interlayer insulating film 23 is provided on the source wire SL, and a bit wire BL is provided on the interlayer insulating film 23. The bit line BL has a band shape along the Y axis. For the interlayer insulating films 15, 16, 17, 18, 19 and 23, and the selective gate insulating film SGI, for example, silicon oxide can be used.
In addition, like the wiring connection portion MU2 illustrated in FIG. 8, at one end in the X-axis direction, the electrode film WL is connected to the word wiring 32 by the via plug 31, and is electrically connected to the drive circuit provided on the substrate 11, for example. Connected to. And similarly, at the other end in the X-axis direction, another electrode film WL is connected to the word wiring by a via plug and electrically connected to the drive circuit. That is, the length of each electrode film WL laminated in the Z-axis direction in the X-axis direction is changed in a stepwise manner, and at one end in the X-axis direction, one electrode film WL establishes an electrical connection with the drive circuit. At the other end in the X-axis direction, the other electrode film WL makes an electrical connection with the drive circuit.
In the non-volatile semiconductor storage device 120 having such a configuration, the control unit CTU performs the operation illustrated in FIG. 6, so that the selective erasing operation ER can be performed and the operation reliability of the device can be improved. Further, by performing the write operation WR and the read operation RD illustrated in FIG. 6, a desired operation can be performed.
(Third embodiment) FIG. 9 is a schematic diagram illustrating the configuration of the non-volatile semiconductor storage device according to the third embodiment. That is, the figure is a circuit diagram illustrating the configuration of the non-volatile semiconductor storage device 103. In FIG. 9, some wirings are omitted in order to make the figure easier to see. FIG. 10 is a table illustrating the operation of the non-volatile semiconductor storage device according to the third embodiment. As shown in FIG. 9, in the non-volatile semiconductor storage device 103 according to the present embodiment, the semiconductor layer of the memory string has a base semiconductor layer. Each memory string has a folded structure.
That is, the non-volatile semiconductor storage device 103 according to the present embodiment includes a memory unit MU and a control unit CTU.
The memory unit MU has a first memory string MCS1, a first wiring W11, a first other unit wiring W12, and a first base wiring SB1. In the following, an example will be described in which the first bit line BL1 is used as the first wiring W11 and the first source line SL1 is used as the first other part wiring W12. The first base wiring SB1 is one of a plurality of base wiring SBs provided.
The first memory string MCS1 includes a first memory cell group MCG1, a first other part memory cell group MCH1, a first selection transistor SGT11, a first selection transistor SGT12, and a first connection part transistor CPT1. Have. In the following, an example will be described in which the first drain side selection transistor SDT1 is used as the first selection transistor SGT11 and the first source side selection transistor SST1 is used as the first other part selection transistor SGT12.
The first memory cell group MCG1 has a plurality of first memory transistors MC1A connected in series. Each of the plurality of first memory transistors MC1A includes a channel formed in the first semiconductor layer SEM1 provided in contact with the first base semiconductor layer BSEM1. Each of the plurality of first memory transistors MC1A has a first control gate CG1A, and data can be electrically rewritten.
The first drain side selection transistor SDT1 is provided on one end side of the first memory cell group MCG1, includes a channel formed in the first semiconductor layer SEM1, and has a first selection gate SG11. In the following, an example in which the first drain side selection gate SGD1 is used as the first selection gate SG11 will be described.
The first source side selection transistor SST1 is provided on the side opposite to the first drain side selection transistor SDT1 of the first memory cell group MCG1 and includes a channel formed in the first semiconductor layer SEM1 to select the first other part. Has gate SG12. In the following, an example in which the first source side selection gate SGS1 is used as the first other part selection gate SG12 will be described.
The first connection transistor CPT1 is provided between the first memory cell group MCG1 and the first source side selection transistor SST1, includes a channel formed in the first semiconductor layer SEM1, and has a first connection gate CPG1. Su. In the following, an example in which the first back gate BG1 is used as the first connection gate CPG1 will be described.
The first other part memory cell group MCH1 is provided between the first source side selection transistor SST1 and the first connection part transistor CPT1 and has a plurality of first other part memory transistors MC1B connected in series.
Each of the plurality of first other part memory transistors MC1B includes a channel formed in the first semiconductor layer SEM1 and has a first other part control gate CG1B, and data can be electrically rewritten.
The first bit line BL1 is connected to the first semiconductor layer SEM1 on the side opposite to the first memory cell group MCG1 of the first drain side selection transistor SDT1. The first source line SL1 is connected to the first semiconductor layer SEM1 on the side opposite to the first other part memory cell group MCH1 of the first source side selection transistor SST1. Then, the first base wiring SB1 is connected to the first base semiconductor layer BSEM1.
In the non-volatile semiconductor storage device 103, the bit line and the source line are arranged in parallel with each other, and the bit line and the source line intersect (for example, orthogonally) with respect to the selection gate, the control gate, and the back gate. ..
(Selective erase operation ER) Hereinafter, the operation of the control unit CTU at the time of the selective erasing operation ER in the non-volatile semiconductor storage device 103 will be described. The control unit CTU performs the following operations during the selective erasing operation ER in the selected cell transistor CL1 of the first memory transistor MC1A (memory cell MC belonging to the first memory cell group MCG1). The selection cell transistor CL1 has a control gate CG1-3.
That is, as shown in FIG. 10, the control unit CTU applies the first voltage V1 (for example, high voltage Vpp, for example 20V) to the first bit line BL1 and the first source line SL1. Alternatively, the control unit CTU sets the first bit line BL1 and the first source line SL1 to the floating state OPN.
Then, a second voltage V2 (for example, 0V) lower than the first voltage V1 is applied to the selected cell gate CG1-3 of the selection cell transistor CL1.
Then, the non-selected cell gates (control gate CG1-1, control gate CG1-2, control gate CG1-4) of the first memory transistor MC1A other than the selected cell transistor CL1 are lower than the first voltage V1 and lower than the second potential V2. A high third voltage V3 (eg, intermediate voltage Vm, eg 10V) is applied.
Then, a third voltage V3 (for example, an intermediate voltage Vm) is applied to the first other part control gate CG1B (control gate CG1-5 to control gate CG1-8).
Then, a tenth voltage V10 lower than the first voltage V1 and higher than the second voltage V2 is applied to the first drain side selection gate SGD1 and the first source side selection gate SGS1. As the tenth voltage V10, for example, an intermediate voltage Vm (for example, 10V) is used.
Then, the eleventh voltage V11, which is lower than the first voltage V1 and higher than the second potential V2, is applied to the first back gate BG1. As the eleventh voltage V11, it can be used with an intermediate voltage Vm. Then, the first voltage V1 (for example, high voltage Vpp, for example, 20V) is applied to the first base wiring SB1.
Due to this voltage relationship, a high electric field is applied between the charge holding layer of the selective cell transistor CL1 and the first base semiconductor layer BSEM1, and electrons are emitted from the charge holding layer to the side of the first base semiconductor layer BSEM1. , Holes are injected into the charge holding layer, or the threshold voltage of the selected cell transistor CL1 becomes lower than 0V.
Then, an intermediate voltage Vm (for example, 10 V) is applied to the control gate of the non-selected memory cell belonging to the same memory cell group as the selected cell transistor CL1, and the applied electric field is low, so that the non-selected memory cell is not erased.
Further, as shown in FIG. 9, the memory unit MU may further have a second memory string MCS2.
The second memory string MCS2 includes a second memory cell group MCG2, a second other part memory cell group MCH2, a second selection transistor SGT21, a second other part selection transistor SGT22, and a second connection part transistor CPT2. Yes. In the following, an example will be described in which the second drain side selection transistor SDT2 is used as the second selection transistor SGT21 and the second source side selection transistor SST2 is used as the second other part selection transistor SGT22.
The second memory cell group MCG2 has a plurality of second memory transistors MC2A connected in series. Each of the plurality of second memory transistors MC2A includes a channel formed in the second semiconductor layer SEM2, which is provided in contact with the second base semiconductor layer BSEM2 and is electrically separated from the first semiconductor layer SEM1. It has 2 control gates CG2A and can electrically rewrite data.
The second drain side selection transistor SDT2 is provided on one end side of the second memory cell group MCG2, includes a channel formed in the second semiconductor layer SEM2, and has a second selection gate SG21. In the following, an example in which the second drain side selection gate SGD2 is used as the second selection gate SG21 will be described.
The second source side selection transistor SST2 is provided on the side opposite to the second drain side selection transistor SDT2 of the second memory cell group MCG2, includes a channel formed in the second semiconductor layer SEM2, and selects the second other part. It has a gate SG22. In the following, an example will be described in which the second source side selection gate SGS2 is used as the second other part selection gate SG22.
The second connection transistor CPT2 is provided between the second memory cell group MCG2 and the second source side selection transistor SST2, includes a channel formed in the second semiconductor layer SEM2, and has a second connection gate CPG2. Su. In the following, an example in which the second back gate BG2 is used as the second connection gate CPG2 will be described.
The second other part memory cell group MCH2 is provided between the second source side selection transistor SST2 and the second connection part transistor CPT2, and has a plurality of second other part memory transistors MC2B connected in series.
Each of the plurality of second other part memory transistors MC2B includes a channel formed in the second semiconductor layer SEM2, has a second other part control gate CG2B, and can electrically rewrite data.
As shown in FIG. 10, during the selective erasing operation ER in the selected cell transistor CL1 of the first memory transistor MC1A (memory cell MC belonging to the first memory cell group MCG1), the control unit CTU. 3rd voltage V3 (control gate CG2-1 ~ control gate CG2-4) and 2nd control gate CG2B (control gate CG2-5 ~ control gate CG2-8) Intermediate voltage Vm) is applied.
Then, the tenth voltage V10 is applied to the second drain side selection gate SGD2 and the second source side selection gate SGS2.
Then, the eleventh voltage V11 is applied to the second back gate BG2. At this time, as described above, the first voltage V1 (for example, 20V which is a high voltage Vpp) is applied to the first base wiring SB1.
The memory cell MC belonging to the second memory string MCS2, which is commonly connected to the first base wiring SB1, the first bit line BL1 and the first source line SL1, is the second drain side selection gate SGD2 and the second source side selection. Intermediate voltage Vm (10V) is applied to the gate SGS2, the second control gate CG2A, the second control gate CG2B (control gate CG2-1 to control gate CG2-8), and the second back gate BG2, resulting in erroneous erasure. , Suppressed.
In this way, the non-selected memory cells of the second memory transistor MC2A and the second other part memory transistor MC2B belonging to the second memory string MCS2 are not erased.
Further, as shown in FIG. 9, the memory unit MU can further include a third memory string MCS, a second wiring W21, a second other unit wiring W22, and a second base wiring SB2. In the following, an example will be described in which the second bit line BL2 is used as the second wiring W21 and the second source line SL2 is used as the second other part wiring W22. The second base wiring SB2 is one of a plurality of base wiring SBs provided.
The third memory string MCS3 includes a third memory cell group MCG3, a third other part memory cell group MCH3, a third selection transistor SGT31, a third other part selection transistor SGT32, and a third connection part transistor CPT3. Yes. In the following, an example will be described in which the third drain side selection transistor SDT3 is used as the third selection transistor SGT31 and the third source side selection transistor SST3 is used as the third other part selection transistor SGT32.
The third memory cell group MCG3 has a plurality of third memory transistors MC3A connected in series. Each of the plurality of third memory transistors MC3A is provided in contact with the third base semiconductor layer BSEM3 and is formed in the third semiconductor layer SEM3 electrically separated from the first semiconductor layer SEM1 and the second semiconductor layer SEM2. It is connected to the first control gate CG1A and can be electrically rewritten.
The third drain side selection transistor SDT3 is provided on one end side of the third memory cell group MCG3, includes a channel formed in the third semiconductor layer SEM3, and is connected to the first selection gate SG11.
The third source side selection transistor SST3 is provided on the side opposite to the third drain side selection transistor SDT3 of the third memory cell group MCG3, includes a channel formed in the third semiconductor layer SEM3, and selects the first other part. It is connected to the gate SG12.
The third connection transistor CPT3 is provided between the third memory cell group MCG3 and the third source side selection transistor SST3, includes a channel formed in the third semiconductor layer SEM3, and is connected to the first connection gate CPG1. Has been done.
The third other part memory cell group MCH3 is provided between the third source side selection transistor SST3 and the third connection part transistor CPT3, and has a plurality of third other part memory transistors MC3B connected in series.
Each of the plurality of third other part memory transistors MC3B includes a channel formed in the third semiconductor layer SEM3, is connected to the first other part control gate CG1B, and can electrically rewrite data.
The second bit line BL2 is connected to the third semiconductor layer SEM3 on the side opposite to the third memory cell group MCG3 of the third drain side selection transistor SDT3. The second source line SL2 is connected to the third semiconductor layer SEM3 on the side opposite to the third other part memory cell group MCH3 of the third source side selection transistor SST3. Then, the second base wiring SB2 is connected to the third base semiconductor layer BSEM3.
During the selective erasing operation ER in the selected cell transistor CL1 of the first memory transistor MC1A (memory cell MC belonging to the first memory cell group MCG1), further control is performed as shown in FIG. The unit CTU further applies a twelfth voltage V12 lower than the first voltage V1 and higher than the second potential V2 to the second bit line BL2 and the second source line SL2. Alternatively, the second bit line BL2 and the second source line SL2 are set to the floating state OPN. As the twelfth voltage V12, for example, an intermediate voltage Vm (for example, 10V) can be used.
Then, a thirteenth voltage V13 lower than the first voltage V1 and higher than the second potential V2 is applied to the second base wiring SB2. As the thirteenth voltage V13, for example, an intermediate voltage Vm (for example, 10V) can be used. Alternatively, the second base wiring SB2 may be set to the floating state OPN.
As a result, the memory cell MC belonging to the memory string (third memory string MCS3) commonly connected to the control gate CG, the selected gate SG, and the back gate BG of the memory cell group to which the selected cell transistor CL1 belongs is the second bit line. Since the intermediate voltage Vm (10V) is applied to BL2 and the second source line SL2, or the floating state OPN is set, no electric field is applied, so it is not erased.
As shown in FIG. 9, the memory unit MU may further have a fourth memory string MCS4.
The 4th memory string MCS4 includes a 4th memory cell group MCG4, a 4th other part memory cell group MCH4, a 4th selection transistor SGT41, a 4th other part selection transistor SGT42, and a 4th connection part transistor CPT4. Yes. In the following, an example will be described in which the fourth drain side selection transistor SDT4 is used as the fourth selection transistor SGT41 and the fourth source side selection transistor SST4 is used as the fourth other part selection transistor SGT42.
The fourth memory cell group MCG4 has a plurality of fourth memory transistors MC4A connected in series. Each of the plurality of fourth memory transistors MC4 is provided in contact with the fourth base semiconductor layer BSEM4, and is electrically separated from the first semiconductor layer SEM1, the second semiconductor layer SEM2, and the third semiconductor layer SEM3. It contains a channel formed in the semiconductor layer SEM4, is connected to the second control gate CG2A, and can electrically rewrite data.
The fourth drain side selection transistor SDT4 is provided on one end side of the fourth memory cell group MCG4, includes a channel formed in the fourth semiconductor layer SEM4, and is connected to the second selection gate SG21.
The fourth source side selection transistor SST4 is provided on the side opposite to the fourth drain side selection transistor SDT4 of the fourth memory cell group MCG4, includes a channel formed in the fourth semiconductor layer SEM4, and selects the second other part. It is connected to the gate SG22.
The fourth connection transistor CPT4 is provided between the fourth memory cell group MCG4 and the fourth source side selection transistor SST4, includes a channel formed in the fourth semiconductor layer SEM4, and is connected to the second connection gate CPG2. Has been done.
The fourth other part memory cell group MCH4 is provided between the fourth source side selection transistor SST4 and the fourth connection part transistor CPT4, and has a plurality of fourth other part memory transistors MC4B connected in series.
Each of the plurality of fourth other part memory transistors MC4B includes a channel formed in the fourth semiconductor layer SEM4, is connected to the second other part control gate CG2B, and can electrically rewrite data.
The second bit line BL2 is further connected to the fourth semiconductor layer SEM4 on the side opposite to the fourth memory cell group MCG4 of the fourth drain side selection transistor SDT4. Further, the second source line SL2 is further connected to the fourth semiconductor layer SEM4 on the side opposite to the fourth other part memory cell group MCH4 of the fourth source side selection transistor SST4. The second base wiring SB2 is further connected to the fourth base semiconductor layer BSEM4.
Similarly to the second memory string MCS2 and the third memory string MCS3, the memory cell MC of the fourth memory string MCS4 having such a configuration is not erased.
(Write operation) Hereinafter, the operation of the control unit CTU during the write operation WR in the non-volatile semiconductor storage device 103 will be described. During the write operation WR in the selected cell transistor CL1 of the first memory transistor MC1A, the control unit CTU performs the following operations.
That is, the control unit CTU applies the second voltage V2 (0V) to the first bit line BL1. Then, the first voltage V1 (high voltage Vpp) is applied to the selected cell gate (control gate CG1-3) of the selected cell transistor CL1.
Then, a fifth voltage V5 (for example, low voltage Vcc) is applied to the non-selected cell gates (control gate CG1-1, control gate CG1-2, and control gate CG1-4) of the first memory transistor MC1A other than the selected cell transistor CL1. To do. Then, a fifth voltage V5 (low voltage Vcc) is applied to the first drain side selection gate SGD1. Then, a fifth voltage V5 (low voltage Vcc) is applied to the second bit line BL2. Alternatively, the second bit line BL2 is set as the floating state OPN. Then, the second voltage V2 (0V) is applied to the first base wiring SB1.
Further, the control unit CTU applies a second voltage V2 (0V) to the first source line SL1. Then, the fifth voltage V5 (low voltage Vcc) is applied to the first other part control gate CG1B (control gate CG1-5 to control gate CG1-8). Then, a second voltage V2 (0V) is applied to the first source side selection gate SGS1. Then, a fifth voltage V5 (low voltage Vcc) is applied to the first back gate BG1. Then, a second voltage V2 (0V) is applied to the second source line SL2.
Then, the second control gate CG2A (control gate CG2-1 to control gate CG2-4), the second control gate CG2B (control gate CG2-5 to control gate CG2-8), and the second drain side selection A second voltage V2 (0V) is applied to the gate SGD2 and the second back gate BG2. Even when 0V is not used as the second voltage V2, 0V is applied to the second control gate CG2A and the second control gate CG2B, and the second drain side selection gate SGD2 and the second back gate BG2. Is also good. Then, the second voltage V2 (0V) is applied to the second source side selection gate SGS2. Further, a low voltage Vcc is applied to the second base wiring SB2. Alternatively, the second base wiring SB2 is set to the floating state OPN. When 0V is not used as the second voltage V2, 0V may be applied to the second base wiring SB2.
As a result, it is possible to write to the desired selection transistor (in this case, the selection cell transistor CL1 belonging to the first memory transistor MC1A).
That is, a high electric field is applied between the charge holding layer of the selective cell transistor CL1 and the first base semiconductor layer BSEM1, electrons are injected into the charge holding layer, or holes are emitted to the first base semiconductor layer BSEM1. The threshold voltage of the selected cell transistor CL1 is higher than 0V.
In a non-selected memory cell belonging to the same memory cell group as the selected cell transistor CL1, writing is not performed because the applied electric field is low.
On the other hand, the first control gate CG1A and the first control gate CG1B (control gate CG1-1 to control gate CG1-8), the first drain side selection gate SGD1, the first source side selection gate SGS1, and the first back. In the memory cell MC included in the memory string adjacent to the memory string that is connected in common with the gate BG1 and includes the selection cell transistor CL, the second bit line BL2 and the second source line SL2 are low voltage Vcc (for example, 3V). , Or, by setting the floating state OPN, writing is prevented.
Further, in the memory string commonly connected to the first base wiring SB1, the first bit line BL1 and the first source line SL1, the second drain side selection gate SGD2 and the second source side selection gate SGS2, and the second By setting the control gate CG2A, the second other part control gate CG2B (control gate CG2-1 to control gate CG2-8), and the second back gate BG2 to low voltage Vcc (for example, 3V) or 0V. , Wrong writing is prevented.
(Read operation RD) Further, the operation of the control unit CTU at the time of the read operation RD in the non-volatile semiconductor storage device 103 will be described.
The control unit CTU performs the following operations during the read operation RD of the selected cell transistor CL1 of the first memory transistor MC1A.
That is, the control unit CTU applies a read-time bit line voltage Ve, which is lower than the fifth voltage V5 (for example, low voltage Vcc) and higher than the second voltage V2 (for example, 0V), to the first bit line BL1. The bit line voltage Ve at the time of reading can be, for example, 1V to 2V. Then, the detection voltage Vse is applied to the selected cell gate (control gate CG1-3) of the selected cell transistor CL1. Then, the fifth voltage V5 (low voltage Vcc) is applied to the non-selected cell gates (control gate CG1-1, control gate CG1-2 and control gate CG1-4) of the first memory transistor MC1A other than the selected cell transistor CL1. .. Then, a fifth voltage V5 (low voltage Vcc) is applied to the first drain side selection gate SGD1. Then, the second voltage V2 (0V) is applied to the second bit line BL2. Then, the second voltage V2 (0V) is applied to the first base wiring SB1.
Further, the control unit CTU applies a second voltage V2 (0V) to the first source line SL1. Then, the fifth voltage V5 (low voltage Vcc) is applied to the first other part control gate CG1B (control gate CG1-5 to control gate CG1-8). Then, a fifth voltage V5 (low voltage Vcc) is applied to the first source side selection gate SGS1. Then, a fifth voltage V5 (low voltage Vcc) is applied to the first back gate BG1. Then, a second voltage V2 (0V) is applied to the second source line SL2. Then, the second voltage V2 (0V) is applied to the second control gate CG2A (control gate CG2-1 to control gate CG2-4) and the second control gate CG2B (control gate CG2-5 to control gate CG2-5). Apply. Then, a second voltage V2 (0V) is applied to the second drain side selection gate SGD2. Then, the second voltage V2 (0V) is applied to the second source side selection gate SGS2. Then, a second voltage V2 (0V) is applied to the second back gate BG2. Further, a second voltage V2 (0V) is applied to the second base wiring SB2.
As a result, the information stored in the desired selection transistor (in this case, the selection cell transistor CL1 belonging to the first memory transistor MC1A) can be read out.
Further, as shown in FIG. 9, when the selected memory cells are the selected cell transistors CL2, CL3 and CL4 belonging to the second, third and fourth memory strings MCS2, MCS3 and MCS4, respectively, as shown in FIG. By using the voltage under the illustrated conditions, the selective erasing operation ER can be performed. Further, in the same manner, the write operation WR and the read operation RD can be performed.
In the non-volatile semiconductor storage device 103 according to the present embodiment, the base semiconductor layer is not separated for each memory cell group, but is shared by adjacent memory cell groups in the same manner as each bit line BL and each source line SL. ing. In the structure in which the base semiconductor layer is separated for each memory cell group, the selection gate SG, control gate CG, and back gate BG of the memory cell group in which the bit line BL and the source line SL are common at the time of selective erasure are the first. Two voltages V2 (0V) may be applied, which has the advantage that the number of terminals to which the voltage is applied is reduced.
(Third Example) Hereinafter, the non-volatile semiconductor storage device 130 of the third embodiment according to the third embodiment will be described. FIG. 11 is a schematic perspective view illustrating the configuration of the non-volatile semiconductor storage device according to the third embodiment. That is, the figure illustrates the configuration of the first and third memory strings MCS1 and MCS3.
As shown in FIG. 11, in the non-volatile semiconductor storage device 130, an interlayer insulating film 13 is provided on a substrate (not shown), and the electrode film WL and the inter-electrode insulating film 14 are alternately laminated on the interlayer insulating film 13. A laminated structure ML is provided. A selection gate SG is provided on the selection gate SG, and an interlayer insulating film 18 is provided on the selection gate SG.
Further, a trench TR is formed in the interlayer insulating film 18, the selective gate SG, and the laminated structure ML. A back gate (first back gate BG1) is provided at the lower part of the trench TR. Then, a laminated insulating film 49 of an outer insulating film 43, a storage layer 48, and an inner insulating film 42 is provided on the inner wall of the trench and the back gate BG. Then, a semiconductor layer SEML made of, for example, p-type polysilicon is embedded in the remaining space inside. The portion of the semiconductor layer SEML close to the electrode film WL is the first semiconductor layer SEM1. The central portion of the semiconductor layer SEML away from the electrode film WL becomes the base semiconductor layer (first base semiconductor layer BSEM1). The upper portion of the first base semiconductor layer BSEM1 has a higher impurity concentration than the first base semiconductor layer BSEM1, for example, p.<sup>+</sup>Area P01 is provided, p<sup>+</sup>Region P01 is the contact portion of the first base wiring SB1 in the first base semiconductor layer BSEM1.
Then, the first drain side selection transistor SDT1 is provided on one wall surface side of the trench TR, and the first source side selection transistor SST1 is provided on the other wall surface side. That is, the selection gate SG on one wall surface side of the trench TR becomes the first drain side selection gate SGD1, and the selection gate SG on the other wall surface side of the trench TR becomes the first source side selection gate SGD1. The stacking direction of the laminated structure ML is the Z-axis direction, and the direction in which the wall surfaces of the trench TR face each other is the Y-axis direction. In this case as well, the direction perpendicular to the Z-axis direction and the Y-axis direction is defined as the X-axis direction.
Then, on the upper part of the first semiconductor layer SEM1, for example, the impurity concentration is higher than that of the first base semiconductor layer BSEM1, n<sup>+</sup>Region P02 is provided, n on one wall side of trench TR<sup>+</sup>Region P02 becomes the drain side contact DC01, n on the other wall side of the trench TR<sup>+</sup>Region P02 is the source side contact SC01.
Then, in the X-axis direction, a third memory string MCS3 having the same configuration as the first memory string MCS1 is provided adjacent to the first memory string MCS1.
In the non-volatile semiconductor storage device 130 having such a configuration, the control unit CTU performs the operations illustrated in FIG. 10, so that the selective erasing operation ER can be performed and the operation reliability of the device can be improved. Further, by performing the write operation WR and the read operation RD illustrated in FIG. 10, a desired operation can be performed.
According to the non-volatile semiconductor storage devices 101 to 103, 110, 120, and 130 according to the first to third embodiments and the first to third embodiments described above, selective erasing is possible. As a result, the stress due to unnecessary data rewriting is not applied to the memory cell, so that the reliability is improved. Further, since the data needs to be rewritten only in the memory cells that need to be rewritten in the large-capacity memory cell array, the data rewriting speed is increased.
In the non-volatile semiconductor storage device according to the embodiment and the embodiment of the present invention, the inter-electrode insulating film 14, the inner insulating film 42 and the outer insulating film 43 are made of silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide, and the like. Any single-layer film selected from the group consisting of aluminum oxynitride, hafnia, hafnium-aluminate, hafnia nitride, hafnium-aluminate nitride, hafnium silicate, hafnium silicate, lanthanum oxide and lanthanum-aluminate. Alternatively, a plurality of laminated films selected from the above group can be used.
In addition, the storage layer 48 includes silicon nitride, silicon oxynitride, aluminum oxide, aluminum oxynitride, hafnium, hafnium aluminate, hafnium nitride, hafnium aluminate nitride, hafnium silicate, hafnium silicate, lanthanum oxide and lantern oxide. Any single-layer film selected from the group consisting of lanthanum aluminate or a laminated film consisting of a plurality of selected from the group can be used.
In the specification of the present application, "vertical" and "parallel" include not only strict vertical and strict parallel, but also variations in the manufacturing process, for example, and may be substantially vertical and substantially parallel. is good.
The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. For example, a memory unit, a control unit, a semiconductor substrate, an electrode film, an insulating film, an insulating layer, a laminated structure, a storage layer, a charge storage layer, a semiconductor pillar, a semiconductor layer, a base semiconductor layer, a word, which constitute a non-volatile semiconductor storage device. Regarding the specific configuration of each element such as a wire, a bit wire, a source wire, a wiring, a memory transistor, a selection transistor, etc., the present invention is similarly carried out by appropriately selecting from a range known to those skilled in the art, and the same effect is obtained. Is included in the scope of the present invention as long as it can be obtained. Further, a combination of any two or more elements of each specific example to the extent technically possible is also included in the scope of the present invention as long as the gist of the present invention is included.
In addition, all non-volatile semiconductor storage devices that can be appropriately designed and implemented by those skilled in the art based on the above-mentioned non-volatile semiconductor storage device as an embodiment of the present invention are also included as long as the gist of the present invention is included. It belongs to the scope of the present invention.
In addition, within the scope of the idea of the present invention, those skilled in the art can come up with various modified examples and modified examples, and it is understood that these modified examples and modified examples also belong to the scope of the present invention. .. For example, those skilled in the art appropriately adding, deleting, or changing the design of each of the above-described embodiments, or adding, omitting, or changing the conditions of the process are also gist of the present invention. As long as it is provided, it is included in the scope of the present invention.
11 ... Semiconductor substrate, 11a ... main face, 13, 13a, 13b, 13c, 15, 16, 17, 18, 19, 23 ... interlayer insulating film, 14 ... interelectrode insulating film, 22 ... Beer, 31 ... Via plug, 32 ... word wiring, 42 ... Inner insulating film, 43 ... outer insulating film, 48 ... memory layer, 49 ... Laminated insulating film, 101, 102, 103, 110, 120, 130 ... Non-volatile semiconductor storage device, BG ... back gate, BG1, BG2 ... 1st and 2nd backgate, BL ... bit line, BL1, BL2 ... 1st and 2nd bit lines, BSEM1, BSEM2 ... 1st and 2nd base semiconductor layers, CG, CG0 / 1-1 ~ CG0 / 1-4, CG1 / 2-5 ~ CG1 / 2-8, CG2 / 3-1 ~ CG2 / 3-4, CG1-1 ~ CG1-8, CG2-1 ~ CG2-8 ... Control gate, CG1A, CG2A ... 1st and 2nd control gates, CG1B, CG2B ... 1st and 2nd control gates, CL1 ~ CL4 ... Selected cell transistor, CP, CPn ... Connection, CP1 ~ CP4 ... 1st ~ 4th connection, CPG1 ~ CPG4 ... 1st ~ 4th connection gate, CPT ... Connection transistor, CPT1 ~ CPT4 ... 1st ~ 4th connection transistor, CTU ... Control unit, CU ... circuit part, DC01 ... Drain side contact, ER ... Selective erase operation, IL ... Insulation layer, LSG ... bottom selection gate, LSGI ... Lower selection gate insulating film, MC, MC1 ~ MC16 ... Memory cell, MC1A, MC2A, MC3A, MC4A ... 1st, 2nd, 3rd and 4th memory transistors, MC1B, MC2B, MC3B, MC4B ... 1st, 2nd, 3rd and 4th other memory transistors, MCG1 ~ MCG4 ... 1st ~ 4th memory cells, MCH1 ~ MCH4 ... 1st ~ 4th other part memory cell group, MCS1 ~ MCS4 ... 1st ~ 4th memory strings, ML ... Laminated structure, MR ... memory array area, MU ... Memory section, MU1 ... Matrix memory cell part, MU2 ... Wiring connection, OPN ... floating state, P01 ... p<sup>+</sup>region, P02 ... n<sup>+</sup>region, PR ... peripheral area, PR1 ... Peripheral area circuit, RD ... read operation, SB ... base wiring, SB1, SB2 ... 1st and 2nd base wiring SC01 ... 1st source side contact, SDT1 ~ SDT4 ... 1st ~ 4th drain side selection transistor, SEM1 ~ SEM4 ... 1st ~ 4th semiconductor layers, SG ... selection gate, SG11, SG21 ... 1st and 2nd control gates, SG12, SG22 ... 1st and 2nd other control gates, SGD1, SGD2 ... 1st and 2nd drain side control gates, SGI ... Selective gate insulating film, SGS1, SGS2 ... 1st and 2nd source side selection gates, SGT11, SGT21, SGT31, SGT41 ... 1st, 2nd, 3rd and 4th selection transistors, SGT12, SGT22, SGT32, SGT42 ... 1st, 2nd, 3rd and 4th other part selection transistors, SL ... source line, SL1, SL2 ... 1st and 2nd source lines, SP, SPn ... Semiconductor pillars, SP1 ~ SP8 ... 1st ~ 8th semiconductor pillars, SST1 ~ SST4 ... 1st ~ 4th source side selection transistor, TH ... through hole, TR ... Trench, USG ... Top Selection Gate, USGI ... Top selection gate insulating film, VA1, VA2 ... Via, V1 ~ V13 ... 1st ~ 13th voltage, Vcc ... low voltage, Ve ... Bit line voltage when reading, Vm ... intermediate voltage, Vpp ... high voltage, Vse ... detection voltage, W11, W21 ... 1st and 2nd wiring, W12, W22 ... 1st and 2nd other parts wiring, WL ... Electrode membrane, WR ... write operation
11 sheets
Sheet 1 Sheet 2 Sheet 3 Sheet 4 Sheet 5 Sheet 6 Sheet 7 Sheet 8 Sheet 9 Sheet 10 Sheet 11
Every citation, both ways
| Document | Relation | Office |
|---|---|---|
| WO2007109883A1 | Cites | World Intellectual Property Organization (WIPO) |
| JP2009146954A | Cites | Japan |
| JP10302488A | Cites | Japan |
| JP2000222895A | Cites | Japan |
7 members in 2 offices
Members7
| Document | Office | Kind | |
|---|---|---|---|
| US2011051527A1 | United States of America | A1 | |
| JP2011054234A | Japan | A | |
| JP5052575B2This record | Japan | B2 | |
| US8320182B2 | United States of America | B2 | |
| USRE45972E | United States of America | E | |
| USRE46809E | United States of America | E | |
| USRE47815E | United States of America | E |
13 legal events, as the office reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | |
|---|---|---|
| Written notification of registration of transferJAPANESE INTERMEDIATE CODE: R350R350 | R350 | |
| Request for change of ownership or part of ownershipJAPANESE INTERMEDIATE CODE: R313111S111 | S111 | |
| Written notification of registration of transferJAPANESE INTERMEDIATE CODE: R350R350 | R350 | |
| Request for change of ownership or part of ownershipJAPANESE INTERMEDIATE CODE: R313111S111 | S111 | |
| Renewal fee payment (event date is renewal date of database)FPAY | FPAY | |
| Written notification of patent or utility model registrationJAPANESE INTERMEDIATE CODE: R151R151 | R151 | |
| First payment of annual fees (during grant procedure)JAPANESE INTERMEDIATE CODE: A61A61 | A61 | |
| Written decision to grant a patent or to grant a registration (utility model)JAPANESE INTERMEDIATE CODE: A01A01 | A01 | |
| Written decision to grant a patent or to grant a registration (utility model)JAPANESE INTERMEDIATE CODE: A01A01 | A01 | |
| Decision of grant or rejection writtenTRDD | TRDD | |
| Written amendmentJAPANESE INTERMEDIATE CODE: A523A521 | A521 | |
| Notification of reasons for refusalJAPANESE INTERMEDIATE CODE: A131A131 | A131 | |
| Written request for application examinationJAPANESE INTERMEDIATE CODE: A621A621 | A621 |
Numbers
- Publication
- 5052575
- Application
- 202063
Titles2
- Japanese
- 不揮発性半導体記憶装置
- English
- Non-volatile semiconductor storage device
Classification
- CPC, 5
- G11C16/14
- G11C16/0483
- G11C16/10
- G11C16/26
- H10B43/27
- IPC, 8
- G11C16 02
- G11C16 06
- G11C16 04
- H10B43 27
- H10B69 00
- H10D30 68
- H10D30 69
- H10D84 00
