Semiconductor element having through electrode, method for manufacturing the same, and memory system including memory element having through electrode
Abstract
Problem to be solved.To provide a semiconductor element capable of obtaining a good yield by reducing the length of protrusion of a through electrode and a method for manufacturing the same. A conductive via of a semiconductor element is stretched vertically through a substrate, and a first end portion of the conductive via is stretched through a first surface of the substrate. It projects in the direction perpendicular to the first surface of the substrate. An insulating film is provided on the first end of the conductive via and on the first surface of the substrate. The upper part of the mask film pattern is removed to expose the capping portion of the insulating film formed on the first end of the conductive via. A recess is formed in the insulating film by being separated from the conductive via and a part of the insulating film formed on the side surface of the conductive via is removed. The capping portion of the insulating film formed on the first end portion of the conductive via is simultaneously removed. [Selection diagram] Fig. 2A

Term
7.2 yearsto projected expiry
Projected expiry 20 December 2033, counted from filing; an application has no term until it is granted.
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31 claims: 7 independent, 24 dependent
- 1基板を貫通して垂直方向に延長され、前記基板の第1面を通過するように延長されて前記基板の第1面に対して前記垂直方向に突出された第1端部を有する伝導性ビアを提供し、 前記伝導性ビアの第1端部及び前記基板の第1面上に絶縁膜を提供し、 前記絶縁膜上にマスク膜を提供し、前記マスク膜をパターニングして前記伝導性ビア部に開口部を有するマスク膜パターンを形成し、 前記マスク膜パターンの上部を除去して前記伝導性ビアの第1端部上に形成された前記絶縁膜のキャッピング部を露出させ、 前記マスク膜パターンをエッチングマスクとして利用して前記伝導性ビアと離隔され、前記伝導性ビアの側面に形成された前記絶縁膜の一部を前記伝導性ビアの第1端部上に形成された前記絶縁膜のキャッピング部と同時に除去して、前記絶縁膜内にリセスを形成することを特徴とする半導体素子の製造方法。
- 2前記マスク膜パターンをエッチングマスクとして利用して前記伝導性ビアと離隔され、前記伝導性ビアの側面に形成された前記絶縁膜の一部を前記伝導性ビアの第1端部上に形成された前記絶縁膜のキャッピング部と同時に除去した後に、前記伝導性ビアを平坦化することを特徴とする請求項1に記載の半導体素子の製造方法。
- 3前記伝導性ビアを平坦化し、前記絶縁膜内の前記整列キーの開口部の角部がラウンド形状の断面プロフィールに形成されることを特徴とする請求項2に記載の半導体素子の製造方法。
- 4前記マスク膜パターンをエッチングマスクとして利用して前記伝導性ビアと離隔され、前記伝導性ビアの側面に形成された前記絶縁膜の一部を前記伝導性ビアの第1端部上に形成された前記絶縁膜のキャッピング部と同時に除去する前に、前記マスク膜パターンのうち少なくとも上部を除去することを特徴とする請求項1に記載の半導体素子の製造方法。
- 5前記マスク膜パターンをエッチングマスクとして利用して前記伝導性ビアと離隔され、前記伝導性ビアの側面に形成された前記絶縁膜の一部を前記伝導性ビアの第1端部上に形成された前記絶縁膜のキャッピング部と同時に除去した後に、前記マスク膜パターンを除去することを特徴とする請求項1に記載の半導体素子の製造方法。
- 6前記絶縁膜を提供することは、 前記伝導性ビアの第1端部及び前記基板の第1面上に下部絶縁膜を形成し、 前記下部絶縁膜上に前記下部絶縁膜に関して蝕刻作用選択性を有する上部絶縁膜を形成することを含み、 前記絶縁膜の一部を除去することは、 前記上部絶縁膜のうち少なくとも一部を除去して前記上部絶縁膜内に前記リセスを形成することを特徴とする請求項1に記載の半導体素子の製造方法。
- 7前記絶縁膜の一部を除去することは、 前記下部絶縁膜のうち少なくとも一部を除去して前記下部絶縁膜内に前記リセスをさらに形成することを特徴とする請求項6に記載の半導体素子の製造方法。
- 8前記絶縁膜上にマスク膜を提供することは、 前記基板の第1面上では第1厚さを有する前記マスク膜の第1部分を提供し、そして前記伝導性ビアの第1端部上では第2厚さを有する前記マスク膜の第2部分を提供することを含み、 前記第1厚さは、前記第2厚さに比べて大きいことを特徴とする請求項1に記載の半導体素子の製造方法。
- 9前記マスク膜を提供することは、 平坦な上面を有する前記マスク膜を提供することを特徴とする請求項8に記載の半導体素子の製造方法。
- 10前記マスク膜の第1部分は、前記基板の上面に対して第1高さを有する上面を含み、 前記伝導性ビアの第1端部上に形成された前記絶縁膜は、前記基板の上面に対して第2高さを有する上面を含み、 前記第1高さは、前記第2高さに比べて小さいことを特徴とする請求項8に記載の半導体素子の製造方法。
- 11前記マスク膜の第1部分は、前記基板の上面に対して第1高さを有する上面を含み、 前記絶縁膜のキャッピング部は、前記基板の上面に対して第2高さを有する上面を含み、 前記第1高さは、前記第2高さに比べて大きいことを特徴とする請求項8に記載の半導体素子の製造方法。
- 12前記マスク膜パターンの上部をさらに除去してリセスされたマスク膜パターンを形成し、 前記リセスされたマスク膜パターンをエッチングマスクとして利用して前記伝導性ビアと離隔され、前記伝導性ビアの側面に形成された前記絶縁膜の一部を除去することを特徴とする請求項1に記載の半導体素子の製造方法。
- 13前記マスク膜をパターニングしてマスク膜パターンを形成することは、 光エネルギーによって完全露光された第1露光領域と光エネルギーによって部分露光された第2露光領域とを形成し、 前記第1露光領域を除去して前記リセスに対応する前記絶縁膜の一部を露出させる開口部を形成し、 前記第2露光領域を除去して前記キャッピング部に対応する前記絶縁膜の一部を露出させる開口部を形成することを特徴とする請求項1に記載の半導体素子の製造方法。
- 14基板を貫通して垂直方向に延長され、前記基板の第1面を通過するように延長されて前記基板の第1面に対して前記垂直方向に突出された第1端部を有する伝導性ビアを提供し、 前記伝導性ビアの第1端部及び前記基板の第1面上に絶縁膜を提供し、 前記絶縁膜上にマスク膜を提供し、前記マスク膜をパターニングして前記伝導性ビア部に開口部を有するマスク膜パターンを形成し、 前記マスク膜パターンの上部を除去して前記伝導性ビアの第1端部上に形成された前記絶縁膜のキャッピング部を露出させ、 前記マスク膜パターンをエッチングマスクとして利用して前記伝導性ビアと離隔され、前記伝導性ビアの側面に形成された前記絶縁膜の一部を除去して、前記絶縁膜内に整列キー開口部を形成し、前記整列キーを形成した後に前記伝導性ビアの第1端部を平坦化することを特徴とする半導体素子の製造方法。
- 15前記マスク膜パターンをエッチングマスクとして利用して前記伝導性ビアと離隔され、前記伝導性ビアの側面に形成された前記絶縁膜の一部を除去して前記絶縁膜内に整列キー開口部を形成することは、 前記伝導性ビアの第1端部上に形成された前記絶縁膜のキャッピング部を除去することと共に進行されることを特徴とする請求項14に記載の半導体素子の製造方法。
- 16基板を貫通し、前記基板の下面外へ突出された下端部を有する貫通電極を形成し、 前記基板の下面上に前記貫通電極を覆う下部絶縁膜を形成し、 前記下部絶縁膜をパターニングして前記下部絶縁膜のうち前記貫通電極の下端部を覆うキャッピング部を除去し、 前記キャッピング部を除去することと共に前記下部絶縁膜の一部が陥没されて定義される整列キーを形成し、 前記基板の下面を平坦化することを特徴とする半導体素子の製造方法。
- 17前記基板の下面を平坦化することは、 前記基板の下面外へ突出された前記貫通電極の下端部、そして前記貫通電極の下端部側面を覆う前記下部絶縁膜の延長部を研磨することを含み、 前記下部絶縁膜の研磨によって前記整列キーの角がラウンド形状にされることを特徴とする請求項16に記載の半導体素子の製造方法。
- 18前記下部絶縁膜を形成した以後に、 前記下部絶縁膜上にマスク膜を形成し、 前記マスク膜をパターニングして前記下部絶縁膜のうち前記整列キーが形成される領域を開放させる開口部を形成し、 前記マスク膜をリセスして前記下部絶縁膜のキャッピング部を露出させることをさらに含み、 前記リセスされたマスク膜をマスクとするエッチング工程で前記下部絶縁膜をパターニングすることを特徴とする請求項16に記載の半導体素子の製造方法。
- 19前記下部絶縁膜を形成した以後に、 前記下部絶縁膜上にマスク膜を形成し、 前記マスク膜に完全露光された第1露光領域と部分露光された第2露光領域を形成し、 前記第1露光領域を完全除去して前記下部絶縁膜のうち前記整列キーが形成される領域を開放させる開口部を形成し、 前記第2露光領域を部分除去して前記下部絶縁膜のキャッピング部を露出させることをさらに含み、 前記開口部を有するマスク膜をマスクとするエッチングによって前記下部絶縁膜をパターニングすることを特徴とする請求項16に記載の半導体素子の製造方法。
- 20前記下部絶縁膜を形成した以後に、 前記下部絶縁膜上にマスク膜を形成し、 前記マスク膜をパターニングして前記下部絶縁膜のうち前記整列キーが形成される領域を開放させる第1開口部と前記下部絶縁膜のキャッピング部を開放させる第2開口部とを形成することをさらに含み、 前記第1開口部と前記第2開口部を有するマスク膜をマスクとするエッチング工程で前記下部絶縁膜をパターニングすることを特徴とする請求項16に記載の半導体素子の製造方法。
- 21第1面とその反対面である第2面を含み、水平方向に伸張する基板と、 前記基板の第1面上に提供された絶縁膜と、 前記基板を貫通して前記水平方向に伸張される前記基板に対して垂直方向に延長され、前記基板の第1面を通過するように延長されて前記基板の第1面に対して前記垂直方向に突出された第1端部を有する伝導性ビアと、 前記伝導性ビアと離隔され、前記伝導性ビアの側面に提供された前記絶縁膜内に形成され、ラウンド形状の断面プロフィールの最外側縁を有する整列キーリセスと、を含むことを特徴とする半導体素子。
- 22前記絶縁膜は、前記基板の第1面上に提供された下部絶縁膜と前記下部絶縁膜上に提供された上部絶縁膜とを含み、 前記下部絶縁膜と前記上部絶縁膜とは、互に異なる蝕刻作用選択性を有し、 前記整列キーリセスは、前記上部絶縁膜内に提供されたことを特徴とする請求項21に記載の半導体素子。
- 23前記整列キーリセスは、前記上部絶縁膜内に形成された部分リセスを含むことを特徴とする請求項22に記載の半導体素子。
- 24前記整列キーリセスは、前記上部絶縁膜内に形成された完全リセスを含むことを特徴とする請求項22に記載の半導体素子。
- 25前記整列キーリセスは、前記上部絶縁膜内に形成された完全リセスと前記下部絶縁膜内に形成された部分リセスとを含むことを特徴とする請求項22に記載の半導体素子。
- 26前記下部絶縁膜は、前記伝導性ビアに沿って前記基板の第1面から伸張されたことを特徴とする請求項22に記載の半導体素子。
- 27前記伝導性ビアの側壁の間へ提供されたビア絶縁膜をさらに含むことを特徴とする請求項22に記載の半導体素子。
- 28前記半導体素子は、第1及び第2半導体素子を含み、 前記第1半導体素子の伝導性ビアは、導電性端子を通じて前記第2半導体素子の伝導性ビアと連結されることを特徴とする請求項21に記載の半導体素子。
- 29前記伝導性端子は、前記第1半導体素子の伝導性ビアと前記第2半導体素子の伝導性ビアとの間で整列されることを特徴とする請求項28に記載の半導体素子。
- 30前記伝導性端子は、水平的にオフセットされて前記第1半導体素子の伝導性ビアと前記第2半導体素子の伝導性ビアとは、整列されないことを特徴とする請求項28に記載の半導体素子。
- 31コマンド信号とアドレス信号とを発生させるメモリコントローラと、 複数個のメモリ素子を含むメモリモジュールと、を含み、 前記メモリモジュールは、前記コマンド信号と前記アドレス信号とが伝達されて前記メモリ素子のうち少なくともいずれか1つに格納及び検索し、 前記メモリ素子各々は、 第1面とその反対面である第2面を含み、水平方向に伸張する基板と、 前記基板の第1面上に提供された絶縁膜と、 前記基板を貫通して前記水平方向に伸張される前記基板に対して垂直方向に延長され、前記基板の第1面を通過するように延長されて前記基板の第1面に対して前記垂直方向に突出された第1端部を有する伝導性ビアと、 前記伝導性ビアと離隔され、前記伝導性ビアの側面に提供された前記絶縁膜内に形成された、そしてラウンド形状の断面プロフィールの最外側縁を有する整列キーリセスと、を含むことを特徴とするメモリシステム。
Independent claims31
57 paragraphs, as filed
The present invention relates to a semiconductor, and more particularly, to a semiconductor element having a through electrode, a method for manufacturing the same, and a memory system including a memory element having the through electrode.
Generally, in the manufacture of a semiconductor device having a through electrode TSV, the through electrode projects out of the inactive surface of the substrate. After that, when an insulating film is vapor-deposited on the non-active surface of the substrate and the vapor-deposited insulating film is polished, the through electrodes are exposed through the polished insulating film. Since the insulating film is deposited on the protruding through electrode, there is a protruding portion on the through electrode. If the length of the protrusion on the through electrode is long, the through electrode will break or be damaged during the polishing process. As a result, the yield of the semiconductor device is lowered, and it is difficult to secure the reliability of the device.
<p><patcit num="1"><text>U.S. Pat. No. 8,039,386</text></patcit></p>
<p> An object of the present invention is to provide a semiconductor device and a method for manufacturing the same, which can reduce the protruding length of the through electrode and obtain a good yield.</p><p> Another object of the present invention is to provide a semiconductor device capable of preventing damage to the through electrode and a method for manufacturing the same.</p><p> Another object of the present invention is to provide a memory system including a semiconductor element that prevents the through electrode from being contaminated or generating a foreign substance, a method for manufacturing the same, and a memory element having the through electrode.</p>
<p> The semiconductor device and the method for manufacturing the semiconductor device according to the present invention for achieving the above object are characterized in that the height of the through electrode is reduced.</p><p> Another feature of the present invention is that the insulating film formed on the protruding lower end of the through electrode is removed at the same time as the alignment key is formed.</p><p> The present invention is to reduce the burden of the chemical mechanical polishing process by removing the insulating film formed on the protruding lower end of the through electrode, and to eliminate or minimize the damage of the through electrode. It is a feature of.</p><p> Another feature of the present invention is that since the alignment key is formed and the mask film is removed while the through electrodes are not exposed, the through electrodes are not contaminated or foreign substances are not generated. ..</p><p> In the method for manufacturing a semiconductor device according to an embodiment of the present invention, the semiconductor element is extended vertically through the substrate and is extended so as to pass through the first surface of the substrate so as to be perpendicular to the first surface of the substrate. A conductive via having a first end portion protruding in the direction is provided, an insulating film is provided on the first end portion of the conductive via and the first surface of the substrate, and a mask film is provided on the insulating film. Provided, the mask film is patterned to form a mask film pattern having an opening in the conductive via portion, and the upper portion of the mask film pattern is removed to form the mask film on the first end portion of the conductive via portion. The capping portion of the insulating film was exposed, and the mask film pattern was used as an etching mask to separate the conductive via from the conductive via, and a part of the insulating film formed on the side surface of the conductive via was made conductive. It includes removing at the same time as the capping portion of the insulating film formed on the first end portion of the via to form a recess in the insulating film.</p><p> In one embodiment, the recess comprises an alignment key for the semiconductor device.</p><p> In one embodiment, the mask film pattern is used as an etching mask to separate the conductive via from the conductive via, and a part of the insulating film formed on the side surface of the conductive via is a first end portion of the conductive via. Further comprising flattening the conductive vias after removing at the same time as the capping portion of the insulating film formed above.</p><p> In one embodiment, flattening the conductive vias comprises forming the corners of the opening of the alignment key in the insulating film into a round cross-sectional profile.</p><p> In one embodiment, further comprising forming a conductive pad on the flattened first end of the conductive via.</p><p> In one embodiment, the mask film pattern is used as an etching mask to separate the conductive via from the conductive via, and a part of the insulating film formed on the side surface of the conductive via is a first end portion of the conductive via. It further includes removing at least the upper part of the mask film pattern before removing it at the same time as the capping portion of the insulating film formed above.</p><p> In one embodiment, the mask film pattern is used as an etching mask to separate the conductive via from the conductive via, and a part of the insulating film formed on the side surface of the conductive via is a first end portion of the conductive via. It further includes removing the mask film pattern after removing it at the same time as the capping portion of the insulating film formed above.</p><p> In one embodiment, providing the insulating film forms a lower insulating film on the first end of the conductive via and the first surface of the substrate, and the lower insulating film is formed on the lower insulating film. Including forming an upper insulating film having etching selectivity, removing a part of the insulating film means removing at least a part of the upper insulating film and placing the recess in the upper insulating film. Including forming.</p><p> In one embodiment, removing a part of the insulating film further includes removing at least a part of the lower insulating film to further form the recess in the lower insulating film.</p><p> In one embodiment, providing a mask film on the insulating film provides a first portion of the mask film having a first thickness on the first surface of the substrate, and a first portion of the conductive via. The first thickness can be larger than the second thickness, including providing a second portion of the mask film having a second thickness on one end.</p><p> In one embodiment, providing the mask film comprises providing the mask film having a flat top surface.</p><p> In one embodiment, the first portion of the mask film includes an upper surface having a first height with respect to the upper surface of the substrate, and the insulating film formed on the first end portion of the conductive via is formed on the insulating film. The first height may be smaller than the second height, including an upper surface having a second height with respect to the upper surface of the substrate.</p><p> In one embodiment, the first portion of the mask film includes an upper surface having a first height with respect to the upper surface of the substrate, and the capping portion of the insulating film has a second height with respect to the upper surface of the substrate. The first height can be larger than the second height.</p><p> In one embodiment, the upper part of the mask film pattern is further removed to form a recessed mask film pattern, and the recessed mask film pattern is used as an etching mask to be separated from the conductive via and the conduction. It further includes removing a part of the insulating film formed on the side surface of the sex via.</p><p> In one embodiment, patterning the mask film to form a mask film pattern forms a first exposed region fully exposed by light energy and a second exposed region partially exposed by light energy. The first exposed area is removed to form an opening that exposes a part of the insulating film corresponding to the recess, and the second exposed area is removed to form a part of the insulating film corresponding to the capping part. Includes forming an opening to be exposed.</p><p> In the method for manufacturing a semiconductor device according to another embodiment of the present invention, the semiconductor element is extended vertically through the substrate and is extended so as to pass through the first surface of the substrate, with respect to the first surface of the substrate. A conductive via having a vertically protruding first end is provided, an insulating film is provided on the first end of the conductive via and the first surface of the substrate, and a mask film is provided on the insulating film. To form a mask film pattern having an opening on the side surface of the conductive via by patterning the mask film, and removing the upper part of the mask film pattern onto the first end portion of the conductive via. The capping portion of the formed insulating film is exposed, the mask film pattern is used as an etching mask to separate the conductive via from the conductive via, and a part of the insulating film formed on the side surface of the conductive via is removed. Then, the alignment key opening is formed in the insulating film.</p><p> In another embodiment, the mask film pattern is used as an etching mask to be separated from the conductive via, and a part of the insulating film formed on the side surface of the conductive via is removed into the insulating film. Forming the alignment key opening proceeds with removing the capping portion of the insulating film formed on the first end of the conductive via.</p><p> In the method for manufacturing a semiconductor element according to another embodiment of the present invention, a through electrode is formed by penetrating a substrate and having a lower end portion protruding outside the lower surface of the substrate, and the through electrode is covered on the lower surface of the substrate. A lower insulating film is formed, the lower insulating film is patterned to remove a capping portion covering the lower end of the through electrode from the lower insulating film, the capping portion is removed, and a part of the lower insulating film is removed. Contains to form a defined alignment key and flatten the underside of the substrate.</p><p> In another embodiment, flattening the lower surface of the substrate means an extension of the lower insulating film that covers the lower end portion of the through electrode protruding outside the lower surface of the substrate and the side surface of the lower end portion of the through electrode. The corners of the alignment key can be rounded by polishing the lower insulating film, including polishing.</p><p> In another embodiment, after the lower insulating film is formed, a mask film is formed on the lower insulating film, and the mask film is patterned to form a region of the lower insulating film in which the alignment key is formed. The lower insulating film is patterned in an etching step using the recessed mask film as a mask, further comprising forming an opening to be opened and recessing the mask film to expose the capping portion of the lower insulating film. ..</p><p> In another embodiment, after the lower insulating film is formed, a mask film is formed on the lower insulating film, and the first exposed region completely exposed to the mask film and the second exposed region partially exposed to the mask film are formed. The lower insulating film is formed by completely removing the first exposed region to form an opening in the lower insulating film that opens the region where the alignment key is formed, and partially removing the second exposed region. The lower insulating film is patterned by etching using the mask film having the opening as a mask, further including exposing the capping portion of the above.</p><p> In another embodiment, after the lower insulating film is formed, a mask film is formed on the lower insulating film, and the mask film is patterned to open a region of the lower insulating film in which the alignment key is formed. An etching step of forming a first opening to be formed and a second opening to open the capping portion of the lower insulating film, and using the mask film having the first opening and the second opening as a mask. The lower insulating film is patterned with.</p><p> The semiconductor element according to one embodiment of the present invention includes a first surface and a second surface opposite to the first surface, a substrate extending in the horizontal direction, an insulating film provided on the first surface of the substrate, and the above. It extends in the direction perpendicular to the substrate that penetrates the substrate and extends in the horizontal direction, and extends so as to pass through the first surface of the substrate in the direction perpendicular to the first surface of the substrate. A conductive via with a protruding first end and an outermost round-shaped cross-sectional profile formed in the insulating film provided on the side surface of the conductive via, separated from the conductive via. Includes aligned key recesses with edges.</p><p> In the device of one embodiment, the insulating film includes a lower insulating film provided on the first surface of the substrate and an upper insulating film provided on the lower insulating film, and the lower insulating film and the upper portion thereof. The insulating films have different etching selectivity from each other, and the alignment key recess can be provided in the upper insulating film.</p><p> In the device of one embodiment, the alignment key recess includes a partial recess formed in the upper insulating film.</p><p> In the device of one embodiment, the alignment key recess includes a complete recess formed in the upper insulating film.</p><p> In the device of one embodiment, the alignment key recess includes a complete recess formed in the upper insulating film and a partial recess formed in the lower insulating film.</p><p> In the device of one embodiment, the lower insulating film may extend from the first surface of the substrate along the conductive vias.</p><p> In the device of one embodiment, a via insulating film provided between the side walls of the conductive via is further included.</p><p> In the element of one embodiment, the semiconductor element includes first and second semiconductor elements, and the conductive vias of the first semiconductor element can be connected to the conductive vias of the second semiconductor element through conductive terminals. ..</p><p> In the device of one embodiment, the conductive terminals may be aligned between the conductive vias of the first semiconductor device and the conductive vias of the second semiconductor device.</p><p> In the device of one embodiment, the conductive terminals may be horizontally offset so that the conductive vias of the first semiconductor element and the conductive vias of the second semiconductor element are not aligned.</p><p> A memory system according to an embodiment of the present invention includes a memory controller that generates a command signal and an address signal, and a memory module including a plurality of memory elements, and the memory module includes the command signal and the address signal. Is transmitted and stored and searched in at least one of the memory elements, and each of the memory elements includes a first surface and a second surface opposite to the first surface, and a substrate extending in the horizontal direction. The insulating film provided on the first surface of the substrate and the insulating film extending in the direction perpendicular to the substrate extending in the horizontal direction through the substrate so as to pass through the first surface of the substrate. A conductive via that has a first end that is extended and protrudes in the direction perpendicular to the first surface of the substrate, and the insulation provided on the side surface of the conductive via that is separated from the conductive via. Includes alignment key recesses formed within the membrane and having the outermost edges of a rounded cross-sectional profile.</p>
<p> According to the present invention, at the time of forming the alignment key, by removing the insulating film formed on the protruding portion of the through electrode, the burden on the subsequent polishing step is reduced, thereby eliminating the breakage or damage of the through electrode. Alternatively, there is an effect that the yield can be improved by minimizing the amount. Further, since the alignment key formation and the strip of the mask film can proceed in a state where the through electrode is not exposed, there is an effect that contamination of the through electrode and generation of foreign substances can be eliminated.</p>
<figref num="1">It is sectional drawing which showed the semiconductor element by one Embodiment of this invention.</figref><figref num="2A">It is sectional drawing which showed an example of the electric connection part in the semiconductor element by one Embodiment of this invention.</figref><figref num="2B">It is sectional drawing which showed the modification of the alignment key in the semiconductor element by one Embodiment of this invention.</figref><figref num="2C">It is sectional drawing which showed the modification of the alignment key in the semiconductor element by one Embodiment of this invention.</figref><figref num="2D">It is sectional drawing which showed various dimensions of the alignment key in the semiconductor element by one Embodiment of this invention.</figref><figref num="3A">It is sectional drawing which showed the other example of the electric connection part in the semiconductor element by another embodiment of this invention.</figref><figref num="3B">It is sectional drawing which showed the other example of the electric connection part in the semiconductor element by another embodiment of this invention.</figref><figref num="4A">It is sectional drawing which showed the semiconductor package which packaged the semiconductor element by one Embodiment of this invention.</figref><figref num="4B">It is sectional drawing which showed the deformation form of FIG. 4A.</figref><figref num="5A">It is sectional drawing which showed the manufacturing method of the semiconductor element by one Embodiment of this invention.</figref><figref num="5B">It is sectional drawing which showed the manufacturing method of the semiconductor element by one Embodiment of this invention.</figref><figref num="5C">It is sectional drawing which showed the manufacturing method of the semiconductor element by one Embodiment of this invention.</figref><figref num="5D">It is sectional drawing which showed the manufacturing method of the semiconductor element by one Embodiment of this invention.</figref><figref num="5E">It is sectional drawing which showed the manufacturing method of the semiconductor element by one Embodiment of this invention.</figref><figref num="5F">It is sectional drawing which showed the manufacturing method of the semiconductor element by one Embodiment of this invention.</figref><figref num="5G">It is sectional drawing which showed the manufacturing method of the semiconductor element by one Embodiment of this invention.</figref><figref num="5H">It is sectional drawing which showed the manufacturing method of the semiconductor element by one Embodiment of this invention.</figref><figref num="5I">It is sectional drawing which showed the manufacturing method of the semiconductor element by one Embodiment of this invention.</figref><figref num="5J">It is sectional drawing which showed the manufacturing method of the semiconductor element by one Embodiment of this invention.</figref><figref num="5K">It is sectional drawing which showed the manufacturing method of the semiconductor element by one Embodiment of this invention.</figref><figref num="5L">It is sectional drawing which showed the manufacturing method of the semiconductor element by one Embodiment of this invention.</figref><figref num="5M">It is sectional drawing which showed the manufacturing method of the semiconductor element by one Embodiment of this invention.</figref><figref num="5O">It is sectional drawing which showed the manufacturing method of the semiconductor element by one Embodiment of this invention.</figref><figref num="5P">It is sectional drawing which showed the manufacturing method of the semiconductor element by one Embodiment of this invention.</figref><figref num="6A">It is sectional drawing which showed the manufacturing method of the semiconductor element by another embodiment of this invention.</figref><figref num="6B">It is sectional drawing which showed the manufacturing method of the semiconductor element by another embodiment of this invention.</figref><figref num="6C">It is sectional drawing which showed the manufacturing method of the semiconductor element by another embodiment of this invention.</figref><figref num="7A">It is sectional drawing which showed the manufacturing method of the semiconductor element by another embodiment of this invention.</figref><figref num="7B">It is sectional drawing which showed the manufacturing method of the semiconductor element by another embodiment of this invention.</figref><figref num="7C">It is sectional drawing which showed the manufacturing method of the semiconductor element by another embodiment of this invention.</figref><figref num="8A">It is a block diagram which showed the memory card provided with the semiconductor element by embodiment of this invention.</figref><figref num="8B">It is a block diagram which showed the information processing system which applied the semiconductor element by embodiment of this invention.</figref>
Hereinafter, a semiconductor device having a through electrode according to the present invention and a method for manufacturing the same will be described in detail with reference to the accompanying drawings. The advantages of the present invention as compared with the prior art can be clarified through detailed description and claims with reference to the accompanying drawings. In particular, the invention is explicitly claimed within the scope of the claims. However, the present invention is best understood by reference to the following detailed description in connection with the accompanying drawings. In the drawings, the same reference numerals indicate the same components throughout the various drawings.
<Example of Semiconductor Device> FIG. 1 is a cross-sectional view showing a semiconductor device according to an embodiment of the present invention. Referring to FIG. 1, the semiconductor device 1 includes an electrical connection 10 that vertically penetrates the substrate 100 and transmits an electrical signal. The electrical connection 10 includes through electrodes 120. According to one example, the through silicon via 120 is stretched substantially perpendicular to the horizontal direction in which the substrate 100 is stretched. A via insulating film 110 is provided between the through electrode 120 and the substrate 100. The via insulating film 110 electrically insulates the through electrode 120 from the substrate 100. A barrier film 124 is further provided between the through silicon via 120 and the via insulating film 110 to prevent the components of the through electrode 120 (eg, copper) from diffusing into the substrate 100.
The semiconductor device 1 further includes at least one of an upper terminal 198 and a lower terminal 118 that are electrically connected to the through electrode 120. As an example, the upper terminal 198 may be arranged on the active surface 100a of the substrate 100 and the lower terminal 118 may be arranged on the inactive surface 100c of the substrate 100. As another example, the lower terminal 118 is arranged on the active surface 100a of the substrate 100, and the upper terminal 198 is arranged on the inactive surface 100c of the substrate 100. The upper terminal 198 and the lower terminal 118 include various forms such as solder balls, solder bumps, rewiring, pads, and the like. As an example, the upper terminal 198 includes a solder ball and the lower terminal 118 includes a pad.
As an example, an integrated circuit 103, a metal wiring 152, and an interlayer insulating film 102 may be further arranged on the active surface 100a of the substrate 100. The metal wiring 152 has a single-layer or multi-layer structure that is electrically connected to the integrated circuit 103. The interlayer insulating film 102 covers the integrated circuit 103 and the metal wiring 152. An upper insulating film 107 having an opening for opening the bonding pad 154 to which the upper terminal 198 is connected is arranged on the interlayer insulating film 102. By electrically connecting the metal wiring 152 and the through electrode 120, the integrated circuit 103 and the through electrode 120 are electrically connected. Through electrodes 120 penetrate the substrate 100 and cross the outer perimeter of the integrated circuit 103 or are located within the horizontal boundaries of the integrated circuit 103.
As an example, the lower insulating film 111 including the alignment key 160 is arranged on the inactive surface 100c of the substrate 100. The alignment key 160 is formed by patterning the lower insulating film 111. The alignment key 160 is used to determine the formation position of the lower terminal 118. The alignment key 160 is also used to align the position of the semiconductor element 1 when stacking the semiconductor element 1 or stacking the semiconductor element 1 on another semiconductor element. The alignment key 160 is arranged outside or inside the integrated circuit 103. As an example, the alignment key 160 is located in the region between the through electrodes 120 contained in the common integrated circuit 103, that is, inside the integrated circuit 103, or in the region outside the through electrodes 120 contained in the common integrated circuit 103. That is, it is arranged outside the integrated circuit 103, or in the inner and outer regions of the through silicon via 120, that is, in the inner and outer regions of the integrated circuit 103. According to this embodiment, the alignment key 160 has rounded corners. This will be described in detail later. The electrical connection 10 includes various structures as described below.
<Example of Electrically Connected Part> FIG. 2A is a cross-sectional view showing an example of the electrically connected part in the semiconductor device according to the embodiment of the present invention. 2B and 2C are cross-sectional views showing a modified example of the alignment key in the semiconductor device according to the embodiment of the present invention. FIG. 2D is a cross-sectional view showing various dimensions of the alignment key in the semiconductor device according to the embodiment of the present invention.
Referring to FIG. 2A, the electrical connection 11 is a Via Middle structure in which the through electrodes 120 are formed after the integrated circuit 103 is formed and before the metal wiring 152 is formed. The interlayer insulating film 102 is formed on the active surface 100a of the substrate 100 to cover the integrated circuit 103, and is formed on the first interlayer insulating film 104 to cover the metal wiring 152 and the bonding pad 154. Includes a second interlayer insulating film 106. As an example, the through silicon via 120 has a column shape that penetrates the first interlayer insulating film 104 and the substrate 100 and is electrically connected to the lower terminal 118. As an example, the through silicon via 120 has a lower end 120p protruding out of the inactive surface 100c.
As an example, the upper terminal 198 and the lower terminal 118 are vertically aligned with the through electrodes 120. As another example, the upper terminal 198 may not be vertically aligned with the through silicon via 120, and / or the lower terminal 118 may be rewired by the metal wire 152, identically or similar to what will be described later in FIG. 4B. .. A plating film 119 containing, for example, gold Au, silver Ag, and platinum Pt is provided on the lower terminal 118. An underbump metal film 170 is provided between the through silicon via 120 and the lower terminal 118.
As an example, the lower insulating film 111 has a double film structure in which the first lower insulating film 108 and the second lower insulating film 109 are laminated. The first lower insulating film 108 is provided on the inactive surface 100c of the substrate 100, and the second lower insulating film 109 may be placed on the first lower insulating film 108. As another example, the lower insulating film 111 may have a single film structure including any one of the first lower insulating film 108 and the second lower insulating film 109. As an example, the first lower insulating film 108 may have an "L" -shaped cross section covering the side surfaces of the inactive surface 100c and the lower end portion 120p of the through electrode 120. As an example, the first lower insulating film 108 includes an extension portion 108e that extends vertically from the inactive surface 100c and covers the side surface of the lower end portion 120p of the through electrode 120. The via insulating film 110 projects out of the inactive surface 100c and is arranged between the lower end portion 120p of the through electrode 120 and the extension portion 108e of the first lower insulating film 108.
As an example, the alignment key 160 is formed by patterning, for example, the second lower insulating film 109. For example, the alignment key 160 is formed by removing a part of the second lower insulating film 109 and flattening it by etching the second lower insulating film 109 and a chemical mechanical polishing step. Due to the chemical mechanical polishing, the corner 162 of the alignment key 160 is not sharp and can be rounded when viewed in cross section. For example, the corner 162 of the alignment key 160 can have a rounded shape due to the increased carving force due to the local pressure increase following chemical mechanical polishing. The alignment key 160 partially exposes the first lower insulating film 108. As an example, the alignment key 160 may be formed to have various forms such as a circular shape, an oval shape, an ellipse shape, a triangle shape, a quadrangle shape, a star shape, a cross shape, and a dash shape on a plane.
As another example, as shown in FIG. 2B, the alignment key 160 may be formed by etching the second lower insulating film 109 to a depth such that the first lower insulating film 108 is not exposed. Therefore, the alignment key 160 has a dented shape formed in the second lower insulating film 109 by partially recessing the second lower insulating film 109. As another example, as shown in FIG. 2C, the alignment key 160 is formed by further etching a part of the first lower insulating film 108 by overetching.
With reference to FIG. 2D, the first thickness T1 of the corner 162 of the alignment key 160 may be smaller than the second thickness T2 of the second lower insulating film 109. For example, the first thickness T1 can be the same as or less than half the second thickness T2. As another example, the first thickness T1 can be larger than half the second thickness T2 depending on the conditions and / or changes in the chemical mechanical polishing process. As another example, the first thickness T1 may be larger or smaller than 1/2 of the third thickness T3 of the lower insulating film 111. The third thickness T3 is the sum of the thickness of the first lower insulating film 108 and the thickness of the second lower insulating film 109.
<Other Examples of Electrical Connections> FIGS. 3A and 3B are cross-sectional views showing other examples of electrical connections in a semiconductor device according to another embodiment of the present invention. The differences from FIG. 2A will be described in detail below, and the same points will be omitted.
Referring to FIG. 3A, the electrical connection 12 is a Via Last structure in which the through silicon via 120 is formed after the integrated circuit 103 and the metal wiring 152 are formed. The through silicon via 120 has a column shape that penetrates the interlayer insulating film 102 and the substrate 100. An upper wiring 153 that electrically connects the through electrode 120 and the bonding pad 154 is further arranged on the upper insulating film 107. The through silicon via 120 further penetrates the upper insulating film 107 and is connected to the upper wiring 153.
Referring to FIG. 3B, the electrical connection 13 has a Via First structure in which the integrated circuit 103 and the metal wiring 152 are formed after the through electrodes 120 are formed. Further provided is a connecting wire 156 electrically connected to a through electrode 120 on the active surface 100a of the substrate 100 with an insulating film 133 interposed therebetween. The through silicon via 120 may be in the form of a pillar that penetrates the substrate 100 that is electrically connected to the metal wiring 152 and / or the integrated circuit 103 through the connecting via 158 that connects the connecting wiring 156 and the metal wiring 152.
<Example of Semiconductor Package> FIG. 4A is a cross-sectional view showing a semiconductor package in which a semiconductor element according to an embodiment of the present invention is packaged. FIG. 4B is a cross-sectional view showing a modified form of FIG. 4A.
Referring to FIG. 4A, the semiconductor package 90 includes a package substrate 80 and one or more semiconductor elements 1 of FIG. 1 mounted on the package substrate 80. The semiconductor package 90 further includes a molding film 85 that molds the semiconductor element 1. The package substrate 80 is a printed circuit board PCB including an upper surface 80a and a lower surface 80b opposite to the upper surface 80a, and an electrical connection wiring 82 is included therein. The semiconductor element 1 is mounted on the upper surface 80a of the package substrate 80 in a face-down state in which the active surface 100a looks at the package substrate 80, for example. As another example, at least one of the semiconductor elements 1 can be mounted on the package substrate 80 in a face-up state. The alignment of the stacking positions of the semiconductor elements 1 is realized by the alignment key 160.
As an example, the semiconductor package 90 further includes one or more solder ball-like external terminals 84 that are attached to the bottom surface 80b of the package substrate 80 and connected to the electrical connection wiring 82. According to this embodiment, the electrical connection between the semiconductor elements 1 and between the semiconductor elements 1 and the package substrate 80 is realized by the through electrodes 120. The electrical connection 10 of the semiconductor device 1 includes at least one of all the electrical connections disclosed herein.
Referring to FIG. 4B, the semiconductor package 95 includes a plurality of semiconductor elements 1a and 1b on the package substrate 80. The semiconductor elements 1a and 1b are the same as or similar to the semiconductor element 1 in FIG. As an example, the first semiconductor device 1a includes a first upper terminal 198a in which the first upper terminal 198a is vertically aligned with the first through electrode 120a, and a rewired first lower terminal 118a. The second semiconductor element 1b includes a second through electrode 120b and a second upper terminal 198b that is not vertically aligned. The second upper terminal 198b is electrically coupled to the rewired first lower terminal 118a. The second lower terminal 118b can be rewired. Other than that, it is configured to be the same as or similar to the semiconductor package 90 of FIG. 4A.
<Example 1 of Manufacturing Method of Semiconductor Device> FIGS. 5A to 5P are cross-sectional views showing a method of manufacturing a semiconductor device according to an embodiment of the present invention.
With reference to FIG. 5A, a via hole 101 is formed in the substrate 100. The substrate 100 is a semiconductor substrate having an active surface on which the integrated circuit 103 is formed, that is, an upper surface 100a and a first lower surface 100b which is the opposite surface thereof, for example, a silicon substrate. A first interlayer insulating film 104 covering the integrated circuit 103 is formed on the upper surface 100a of the substrate 100. The integrated circuit 103 can be a memory circuit, a logic circuit, or a combination thereof. The first interlayer insulating film 104 is formed by depositing a silicon oxide film or a silicon nitride film. The via hole 101 is opened toward the upper surface 100a of the substrate 100 and is formed in the form of a hollow pillar having a length not reaching the first lower surface 100b. The via hole 101 is substantially vertical from the upper surface 100a of the substrate 100 toward the first lower surface 100b. The via hole 101 is obtained by dry-etching or drilling the first interlayer insulating film 104 and the substrate 100, which correspond to the periphery of the integrated circuit 103, for example, the scribe lane and the region adjacent thereto, or the region where the integrated circuit 103 is formed. To form.
Referring to FIG. 5B, an insulating film 110a covering the inner surface of the via hole 101 is formed, and a conductive film 120a is formed on the substrate 100 so as to fill the via hole 101. As an example, the insulating film 110a is formed by depositing a silicon oxide film or a silicon nitride film. The conductive film 120a is formed by depositing or plating polysilicon, copper, tungsten, aluminum or the like. When the conductive film 120a is formed of copper or a conductor containing copper, a metal film 124a that acts as an anti-diffusion film that prevents the diffusion of copper can be further formed on the insulating film 110a. The metal film 124a is formed by depositing a metal or a conductive substance containing titanium Ti, titanium nitride TiN, chromium Cr, tantalum Ta, tantalum nitride TaN, nickel Ni or a combination thereof and extending along the insulating film 110a. To form.
Referring to FIG. 5C, the conductive film 120a and the insulating film 110a are flattened to expose the first interlayer insulating film 104. Flattening can proceed by etchback or chemical polishing steps. By the flattening, the conductive film 120a is formed as a through silicon via 120 in the form of a column that substantially vertically penetrates the substrate 100 and the first interlayer insulating film 104, and the insulating film 110a is a via that electrically insulates the through electrode 120 from the substrate 100. It is formed as an insulating film 110. When the metal film 124a is further formed, the metal film 124a is formed as a barrier film 124 that prevents components (eg, Cu) forming the through electrode 120 from diffusing into the substrate 100 and the integrated circuit 103 by the flattening. In the following, the illustration of the barrier film 124 will be omitted.
With reference to FIG. 5D, the back end process can proceed. As an example, a single-layer or multi-layer metal wiring 152 connected to a through electrode 120 on the first interlayer insulating film 104, a bonding pad 154 electrically connected to the metal wiring 152, and a metal wiring 152 and a bonding pad 154. A second interlayer insulating film 106 is formed to cover the and. The metal wiring 152 and the bonding pad 154 are formed by depositing a metal such as copper or aluminum and patterning them. The second interlayer insulating film 106 is formed by depositing an insulator that is the same as or similar to that of the first interlayer insulating film 104, for example, a silicon oxide film or a silicon nitride film. The upper insulating film 107 can be formed on the second interlayer insulating film 106. The upper insulating film 107 is formed in a form in which a silicon oxide film, a silicon nitride film, a polymer, or the like is vapor-deposited and then patterned to expose the bonding pad 154. The bumping process can be selectively further advanced to further form upper terminals 198 such as solder balls and solder bumps connected to the bonding pad 154.
With reference to FIG. 5E, the first lower surface 100c of the substrate 100 is recessed to project the through silicon via 120. For example, etching using etchings or slurries that can selectively remove substances (eg, silicon) that make up the substrate 100, chemical mechanical polishing, grinding, or a combination of these recesses the first lower surface 100b of the substrate 100. To do. The recess step proceeds until a second lower surface 100c, which can project the lower end portion 120p of the through electrode 120, appears further adjacent to the upper surface 100a as compared with the first lower surface 100b. The step of projecting the through silicon via 120 can proceed in a state where the support plate 70 is attached to the upper surface 100a of the substrate 100 with the interposition of the adhesive film 72. The projecting step may proceed in a state in which the upper surface 100a of the substrate 100 faces upward, or in a state in which the upper surface 100a overturns the substrate 100 and faces downward. As used herein, the upper surface 100a of the substrate 100 may be an active surface and the second lower surface 100c may be an inactive surface. As another example, the upper surface 100a can be an inactive surface and the first lower surface 100b can be an active surface, or the upper surface 100a and the first lower surface 100b can all be active or inactive surfaces.
With reference to FIG. 5F, a silicon nitride film or a silicon oxide film is vapor-deposited on the inactive surface 100c of the substrate 100 to form the first lower insulating film 108 and the second lower insulating film 109. As an example, a silicon nitride film is vapor-deposited on the inactive surface 100c to form the first lower insulating film 108, and a silicon oxide film is vapor-deposited on the first lower insulating film 108 to form the second lower insulating film 109. To do. The first lower insulating film 108 has a thinner thickness than the second lower insulating film 109. The first lower insulating film 108 can embed a gap formed between the inactive surface 100c and the second lower insulating film 109, and between the inactive surface 100c and the lower end 120p of the through electrode 120. The first lower insulating film 108 and the second lower insulating film 109 are formed in a curved shape that covers the lower end portion 120p of the through electrode 120. Therefore, the protrusion 190 is formed on the inactive surface 100c of the substrate 100. As another example, any one of the first lower insulating film 108 and the second lower insulating film 109 may be omitted. For example, it is possible to omit forming the first lower insulating film 108. As another example, a larger number of insulating films than the two insulating films 108 and 109 can be formed.
Referring to FIG. 5G, after the mask film 130 is formed on the second lower insulating film 109, the mask film 130 is exposed to light energy by using a photo process using a photomask 140a. As an example, a positive resist is applied to form a mask film 130, and a photomask 140a is used to form a region 141 (hereinafter, exposure) of the mask film 130 in which an alignment key (160 in FIG. 5J) is formed. Area) is exposed. The photomask 140a is a fully exposed binary mask that allows the exposed area 141 to be fully exposed (eg 100% exposed). As an example, the mask film 130 can be in the form of having a hillock on the protrusion 190. The mask film 130 has a non-uniform thickness. For example, the mask film 130 has a first thickness T1 on the inactive surface 100c and a second thickness (T2 <T1) smaller than the first thickness T1 on the protrusion 190. The first thickness T1 of the mask film 130 may be smaller or the same as the protrusion length L of the protrusion 190. Unlike this, the first thickness T1 of the mask film 130 can be larger than the protrusion length L of the protrusion 190.
Referring to FIG. 5H, an opening 130a is formed to expose the second lower insulating film 109. The opening 130a is formed by patterning the mask film 130 with a developer capable of selectively removing the exposed region 141. The opening 130a has a planar shape such as a circle, an oval, an ellipse, a triangle, a quadrangle, a star, a cross, a dash, and the like.
With reference to FIG. 5I, the mask film 130 is recessed. As a result, a part of the protruding portion 190 formed on the lower end portion 120p of the through electrode 120, that is, the capping portion 109f of the second lower insulating film 109 is exposed.
With reference to FIG. 5J, the alignment key 160 is formed. The capping portion 109f is removed at the same time as the alignment key 160 is formed. For example, the second lower insulating film 109 is patterned by etching using the recessed mask film 130 (eg, dry engraving). The alignment key 160 is formed under the opening 130a by the patterning of the second lower insulating film 109, and the capping portion 109f of the second lower insulating film 109 is removed at the same time as the alignment key 160 is formed.
With reference to FIG. 5K, the mask film 130 is stripped and the remaining portion of the protrusion 190 is removed in the flattening step. As another example, the mask film 130 and the protrusion 190 are removed in the flattening step. As an example, the flattening can employ a chemical mechanical polishing process. According to the present embodiment, since the capping portion 109f of the second lower insulating film 109 has already been removed as described in FIG. 5J, the chemical mechanical polishing depth P1 when the capping portion 109f is removed. Is reduced compared to the depth P2 when the capping portion 109f is not removed. As an example, chemical mechanical polishing is covered with a mask film 130 by removing the extension 109e of the second lower insulating film 109 which extends vertically from the inactive surface 100c and covers the lower end 120p side surface of the through electrode 120. It proceeds until the surface 109s of the second lower insulating film 109 appears or the surface 109s of the second lower insulating film 109 is polished. If the capping portion 109f is removed in advance as in the present embodiment, the chemical mechanical polishing process is simplified and the burden of the chemical mechanical polishing process is reduced from the depth P2 to the depth P1. In addition, the reduced chemical mechanical polishing depth P1 can minimize breakage and damage to the through silicon via 120.
According to this embodiment, the alignment key 160 is formed (FIG. 5J) and the mask film 130 is removed (FIG. 5K) in a state where the through electrode 120 is not exposed. This eliminates the phenomenon that the particles generated in the etching step and / or the removing step of the mask film 130, which are necessary for forming the alignment key 160, contaminate the through electrode 120. Further, since the through electrode 120 is not exposed, there is no room for oxides and particles generated in the exposed through electrode 120.
Referring to FIG. 5L, the lower surface 120s of the through electrode 120 which is flattened by removing the protrusion 190 on the inactive surface 100c of the substrate 100 by the chemical mechanical polishing appears. By the flattening step, the surface 109s of the second lower insulating film 109 is flattened and coplanar with the lower surface 120s of the through electrode 120. The alignment key 160 has rounded corners 162. As the flattening step proceeds, the local pressure on the edge or edge 162 of the second lower insulating film 109 is increased. As a result, the edge of the alignment key 160, that is, the corner 162 has a round cross section. As an example, as illustrated in FIG. 2D, the thickness of the angle 162 is greater than half the thickness of the second lower insulating film 109, or half the thickness of the first and second lower insulating films 108, 109. Or it can be small. Even if the through electrode 120 is chemically polished, the lower end 120p may not be completely polished. Therefore, the through silicon via 120 can have a form protruding onto the inactive surface 100c. The first lower insulating film 108 is polished so that the cross section including the extension portion 108e extending vertically from the inactive surface 100c and covering the side surface of the lower end portion 120p of the through electrode 120 has an L shape. When the projecting portion 190 is polished, the via insulating film 110 is partially removed and has a form of projecting out of the inactive surface 100c. A via insulating film 110 projecting to the outside of the inactive surface 100c of the substrate 100 is arranged between the lower end portion 120p of the through electrode 120 and the extension portion 108e of the first lower insulating film 108.
Referring to FIG. 5M, a metal film 170a is deposited on the inactive surface 100c, and a mask film 135 is formed on the metal film 170a. The metal film 170a contains nickel Ni, gold Au, or nickel Ni / gold Au. The mask film 135 is formed by coating and patterning a photoresist. The mask film 135 includes an opening 135a that is vertically aligned with the through electrodes 120.
Referring to FIG. 5N, the rear pad 118 is formed by electroplating on the metal film 170a. As an example, the rear pad 118 comprises copper Cu, aluminum Al, nickel Ni, or a combination thereof. A plating film 119 can be further included on the rear pad 118. The plating film 119 contains gold Au, silver Ag, platinum Pt and the like. The plating film 118 can be selectively formed in order to prevent oxidation of the rear pad 118, improve the contact property with the bonding wire and the solder ball, improve the electrical characteristics, and the like. The rear pad 118 and / or the plating film 119 is formed confined to the opening 135a.
With reference to FIG. 5O, the mask film 135 is removed by an ashing or stripping process. As a result, the metal film 170b covered with the mask film 135 is exposed. If the exposed metal film 170b is removed by etching, the metal film 170 (under bump metal film) remains between the rear pad 118 and the through electrode 120.
With reference to FIG. 5P, the adhesive film 72 and the support plate 70 are removed. As a result, the through electrode 120, the lower insulating film 111 having a double film structure in which the first lower insulating film 108 and the second lower insulating film 109 are laminated on the inactive surface 100c, and the second lower insulating film 109. An electrical connection 11 is formed that includes an alignment key 160 formed by patterning. Through electrode 120 includes a lower end portion 120p protruding outward from the inactive surface 100c. The first lower insulating film 108 has an "L" -shaped cross section including an extension 108e that covers the side wall of the lower end 120p of the through electrode 120. According to this embodiment, the corner 162 of the alignment key 160 is rounded by a chemical mechanical polishing process that flattens the protrusion 190 as described in FIG. 5K.
<Example 2 of Manufacturing Method of Semiconductor Device> FIGS. 6A to 6C are cross-sectional views showing a method of manufacturing a semiconductor device according to another embodiment of the present invention.
Referring to FIG. 6A, a first thickness T1 and above on the inactive surface 100c of the substrate 100 on which the protrusion 190 was formed using the same or similar steps as described in FIGS. 5A-5G. A mask film 130 having a thin second thickness T2 is formed. Subsequently, in the photo step using the photomask 140b, the first region 141 (hereinafter referred to as the first exposure region) in which the alignment key (160 in FIG. 6C) is formed by the mask film 130 and the second region 142 covering the protruding portion 190. (Hereinafter, the second exposure area) is exposed. The mask film 130 contains a positive resist. As an example, the photomask 140b can be a halftone type PSM or attenduated PSM capable of full and partial exposure. According to one example, in the photomask 140b, the first region 141 (hereinafter, the first exposure region) in which the alignment key (160 in FIG. 6C) is formed in the mask film 130 is completely exposed (example: 100% exposure). The second region 142 (first region) on the protrusion 190 is partially exposed (eg, 50% exposed).
Referring to FIG. 6B, the mask film 130 is patterned with a developer capable of selectively removing the first exposure region 141 and the second exposure region 142. According to the present embodiment, the first exposed region 141 is completely removed to form an opening 130a that exposes the second lower insulating film 109. The second exposure region 142 is partially removed to expose the protrusion 190. According to the present embodiment, since the second exposure region 142 is partially removed and the protrusion 190 is exposed, the recess step of the mask film 130 for exposing the protrusion 190 can be skipped as shown in FIG. 5I. ..
With reference to FIG. 6C, the alignment key 160 is formed. The capping portion 109f is removed at the same time as the alignment key 160 is formed. For example, the second lower insulating film 109 is patterned by etching using the mask film 130 to form an alignment key 160 under the opening 130a, and at the same time, the capping portion 109f of the second lower insulating film 109 is removed. After that, the electrical connecting portion 11 of FIG. 5P is formed by the same as or similar to that shown in FIGS. 5K to 5P by stripping the mask film 130, polishing the protruding portion 190, and electroplating. ..
<Example 3 of Manufacturing Method of Semiconductor Device> FIGS. 7A to 7C are cross-sectional views showing a method of manufacturing a semiconductor device according to another embodiment of the present invention.
Referring to FIG. 7A, a mask film is applied by applying a positive resist on the inactive surface 100c of the substrate 100 on which the protrusion 190 is formed by using the same or similar process as described in FIGS. 5A to 5G. Form 130. Subsequently, of the mask film 130 in the photo step using the photomask 140c, the region 141 (hereinafter, the first exposure region) in which the alignment key (160 in FIG. 7C) is formed and the region 142 (hereinafter, the region 142) covering the protruding portion 190 are formed. The second exposure area) is exposed. The mask film 130 is formed so as to flatly cover the inactive surface 100c and the protrusion 190. Thereby, the mask film 130 has a large thickness D1 on the inactive surface 100c and a small thickness D2 (<D1) on the protrusion 190. The thickness D1 of the mask film 130 on the inactive surface 100c is larger than the protrusion length L of the protrusion 190. The photomask 140c is a binary mask capable of full exposure, whereby the first exposure region 141 and the second exposure region are fully exposed (eg, 100% exposure). As another example, the photomask 140c is a halftone halftone mask that allows the first exposure area 141 to be fully exposed (eg 100% exposure) and the second exposure area 142 to be partially exposed (eg 50% exposure). can be type PSM).
Referring to FIG. 7B, the mask film 130 is patterned with a developer capable of selectively removing the first exposure region 141 and the second exposure region 142. According to the present embodiment, the first exposure region 141 is removed to form an opening 130a (hereinafter, the first opening) that exposes the second lower insulating film 109. Further, the second exposed region 142 is removed to form an opening 130b (hereinafter, a second opening) that exposes the protruding portion 190. According to the present embodiment, since the protruding portion 190 is exposed through the second opening 130b, the recess step of the mask film 130 for exposing the protruding portion 190 can be skipped as shown in FIG. 5I.
With reference to FIG. 7C, the alignment key 160 is formed. The capping portion 109f is removed at the same time as the alignment key 160 is formed. For example, the second lower insulating film 109 is patterned by etching using the mask film 130 to form an alignment key 160 under the first opening 130a, and at the same time, the capping portion 109f of the second lower insulating film 109 is removed. .. After that, the same as or similar to that shown in FIGS. 5K to 5P, the strip of the mask film 130, the polishing of the protruding portion 190, the electroplating, and the like form the electrical connecting portion 11 of FIG. 5P. ..
<Application Example of Semiconductor Element> FIG. 8A is a block diagram showing a memory card including the semiconductor element according to the embodiment of the present invention. FIG. 8B is a block diagram showing an information processing system to which the semiconductor element according to the embodiment of the present invention is applied.
With reference to FIG. 8A, the memory card 1200 includes a memory controller 1220 that controls various data exchanges between the host 1230 and the memory 1210. SRAM1221 is used as the operating memory of the central processing unit 1222. Host interface 1223 comprises a data exchange protocol for host 1230 connected to memory card 1200. The error correction code 1224 can detect and correct an error contained in the data read from the memory 1210. Memory interface 1225 interacts with memory 1210. The central processing unit 1222 performs various control operations for exchanging data of the memory controller 1220. At least one of the memory 1210, SRAM 1221 and the central processing unit 1222 includes the semiconductor element 1 and the semiconductor packages 90, 95 and at least one of them.
Referring to FIG. 8B, the information processing system 1300 includes a memory system 1310 comprising at least one of a semiconductor element 1 and semiconductor packages 90, 95 according to an embodiment of the present invention. The information processing system 1300 includes mobile devices, computers, and the like. As an example, the information processing system 1300 includes a memory system 1310 and a modem 1320, each electrically connected to the system bus 1360, a central processing unit 1330, RAM 1340, and a user interface 1350. The memory system 1310 includes a memory 1311 and a memory controller 1312, and is configured substantially in the same manner as the memory card 1200 of FIG. 8A. In such a memory system 1310, data processed by the central processing unit 1330 or data input from the outside is stored. The information processing system 1300 includes memory cards, semiconductor disk devices (Solid State Disks), camera image processors (Camera Image Sensors), and other application chipsets (Applications). It is provided as Chipset). As an example, the memory system 1310 is composed of a semiconductor disk device SSD, in which case the information processing system 1300 stores a large amount of data in the memory system 1310 in a stable and reliable manner.
The above detailed description of the invention is not intended to limit the invention to the disclosed embodiments and can be used in a variety of other associations, modifications and environments without departing from the gist of the invention. The scope of the attached claims must be construed to include other implementation states.
1 Semiconductor elements 10, 11, 12, 13 Electrical connection 100 Substrate 101 Via hole 102 Interlayer insulating film 103 Integrated circuit 104 First interlayer insulating film 106 Second interlayer insulating film 107 Upper insulating film 108 First lower insulating film 109 2 Lower insulating film 109f Capping part 110 Via insulating film 111 Lower insulating film 118 Lower terminal 119 Plating film 120 Penetrating electrode 124 Barrier film 152 Metal wiring 154 Bonding pad 160 Alignment key 170 Under bump metal film 190 Protruding part 198 Upper terminal
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Every citation, both ways
| Document | Relation | Office | Category | Cited during | Relevant claims |
|---|---|---|---|---|---|
| KR20180008394A | Cited by | Republic of Korea | – | Search report | – |
| US11991468B2 | Cited by | United States of America | – | Applicant | – |
| JPWO2016185901A1 | Cited by | Japan | – | Search report | – |
| JP2001326325A | Cites | Japan | Y | Search report | 24 |
| JP2001326325A | Cites | Japan | Y | Search report | 24 |
| US2012001337A1 | Cites | United States of America | XY | Search report | 14,16-22,23-25 |
| US2012001337A1 | Cites | United States of America | XY | Search report | 14,16-22,23-25 |
| JP2012142414A | Cites | Japan | Y | Search report | 23,25 |
| JP2012142414A | Cites | Japan | Y | Search report | 23,25 |
7 members in 3 offices
Priority claims4
| Document | Office | Kind | Date |
|---|---|---|---|
| 1020120149598 | Republic of Korea | – | |
| 20120149598 | Republic of Korea | A | |
| 14108771 | United States of America | – | |
| 201314108771 | United States of America | A |
Members7
| Document | Office | Kind | |
|---|---|---|---|
| US2014179103A1 | United States of America | A1 | |
| KR20140080132A | Republic of Korea | A | |
| JP2014123740AThis record | Japan | A | |
| US9070748B2 | United States of America | B2 | |
| US2015243637A1 | United States of America | A1 | |
| JP6316585B2 | Japan | B2 | |
| KR102018885B1 | Republic of Korea | B1 |
15 legal events, as the office reported them to INPADOC
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Numbers
- Publication
- 2014123740
- Application
- 264445
Titles2
- Japanese
- 貫通電極を有する半導体素子、その製造方法及び貫通電極を有するメモリ素子を含むメモリシステム
- English
- A memory system including a semiconductor element having a through electrode, a manufacturing method thereof, and a memory element having a through electrode.
Classification
- CPC, 45
- H10W90/00
- H10W72/00
- H10P72/7422
- H10P72/7416
- H10P72/74
- H10W20/023
- H10W74/147
- H10W20/20
- H10W46/00
- H10W72/01204
- H10W72/01235
- H10W72/012
- H10W72/01255
- H10W72/244
- H10W72/222
- H10W72/252
- H10W72/237
- H10W72/248
- H10W90/722
- H10W90/724
- H10W46/301
- H10W46/601
- H10W70/65
- H10W72/01904
- H10W72/01953
- H10W72/019
- H10W72/923
- H10W72/9226
- H10W72/29
- H10W72/922
- H10W72/9415
- H10W72/942
- H10W72/952
- H10W72/944
- H10W90/297
- H10W90/26
- H10W20/2134
- H10W20/0249
- H10W20/0245
- H10W20/056
- H10W20/062
- H10W72/20
- H10W72/823
- G11C8/00
- G11C16/08
- IPC, 8
- H01L21 3205
- H01L21 768
- H01L23 522
- H01L27 10
- H01L25 065
- H01L25 07
- H01L25 18
- H10P14 40