Flip chip semiconductor element and method for manufacturing the same
Abstract
[Task] To provide a flip-chip type semiconductor element capable of extremely effectively preventing a short circuit between positive and negative electrodes and a method for manufacturing the same.
Solution.The substrate 1, the n-type semiconductor layer (first semiconductor) 2, and the p-type semiconductor layer (second semiconductor) 3 are laminated in this order, and the conductor 6 is provided on the n-type electrode 4 provided on the n-type semiconductor layer 2. , A conductor 7 is provided on the p-type electrode 5 provided on the p-type semiconductor layer 3, an insulating protective film 8b covers the upper parts of the n-type electrode 4 and the p-type electrode 5, and the connection portion 6c of the conductor 6 and The connection portion 7c of the conductor 7 is a flip-chip type semiconductor element in which the connection portion 6 and the connection portion 7 are formed at positions different from the upper portion 9 of the corresponding conductor 6 and the upper portion 10 of the conductor 7.
Term
Term ended
Projected expiry passed 20 March 2022, 4.5 years ago.
- Priority and filed
- Published
- Projected expiry
- Today
15 claims: 5 independent, 10 dependent
- 1【特許請求の範囲】 【請求項1】 第1の電極が設けられた第1の半導体と、前記第1の半導体に形成され前記第1の半導体とは異なる導電型を有する第2の電極が設けられた第2の半導体と、前記第1の電極及び前記第2の電極のうち少なくともいずれか一方に電気的に接続された導電体と、前記第1及び第2の半導体の少なくとも一部を覆うように設けられた絶縁保護膜と、を少なくとも構成中に含有するフリップチップ型半導体素子であって、前記導電体が接続されている前記電極の上部は、前記絶縁保護膜で覆われており、前記導電体の一部分には、電気的に接続される接続部を有しており、前記接続部は、前記導電体が接続されている前記電極の半導体に対して、前記導電体が接続されている前記電極の上部とは異なる位置に前記接続部が形成されていることを特徴とするフリップチップ型半導体素子。
- 2【請求項2】 第1の電極が設けられた第1の半導体と、前記第1の半導体に形成され前記第1の半導体とは異なる導電型を有する第2の電極が設けられた第2の半導体と、前記第1の電極及び前記第2の電極のそれぞれに電気的に接続された導電体と、前記第1及び第2の半導体の少なくとも一部を覆うように設けられた絶縁保護膜と、を少なくとも構成中に含有するフリップチップ型半導体素子であって、前記導電体が接続されている前記電極の上部は、前記絶縁保護膜で覆われており、前記導電体の一部分には、電気的に接続される接続部を有しており、前記接続部は、前記導電体が接続されている前記電極の半導体に対して、前記導電体が接続されている前記電極の上部とは異なる位置に前記接続部が形成されており、前記対応する接続部間の距離は、前記対応する第1及び第2の電極間の距離よりも広いことを特徴とするフリップチップ型半導体素子。
- 3【請求項3】 前記第1の半導体に第2の半導体を形成する側に設けられた前記接続部と前記絶縁保護膜であって、前記接続部の上面と前記絶縁保護膜の上面とは、ほぼ同一平面にあることを特徴とする請求項1又は2のいずれかに記載のフリップチップ型半導体素子。
- 4【請求項4】 前記絶縁保護膜は、第1の絶縁保護膜と第2の絶縁保護膜とから構成されており、前記第1の絶縁保護膜は、前記導電体と接続される部分を除く前記電極部分と、前記第1及び第2の半導体と、の少なくとも一部分を覆うように設けられており、前記第2の絶縁保護膜は、前記導電体が接続されている前記電極の上部を覆うように設けられていることを特徴とする請求項1乃至3のいずれか一項に記載のフリップチップ型半導体素子。
- 5【請求項5】 前記絶縁保護膜、前記第1の絶縁保護膜及び前記第2の絶縁保護膜のうち少なくともいずれか1つは、AlNとポリシラザンとが少なくとも含有されていることを特徴とする請求項1乃至4のいずれか一項に記載のフリップチップ型半導体素子。
- 6【請求項6】 前記導電体は、第1の導電体と第2の導電体とから構成されており、前記第1の導電体は、前記第1の絶縁保護膜上に形成されており、前記第2の導電体の一の部分は、前記第1の導電体と電気的に接続されており、前記第2の導電体の他の部分は、接続部が形成されていることを特徴とする請求項1乃至5のいずれか一項に記載のフリップチップ型半導体素子。
- 7【請求項7】 前記フリップチップ型半導体素子の厚みは、10~200μmであることを特徴とする請求項1乃至6のいずれか一項に記載のフリップチップ型半導体素子。
- 8【請求項8】 前記フリップチップ型半導体素子は、フリップチップ型半導体発光素子であることを特徴とする請求項1乃至7のいずれか一項に記載のフリップチップ型半導体発光素子。
- 9【請求項9】 フリップチップ型半導体発光素子と、該フリップチップ型半導体発光素子からの光の一部を吸収してそれよりも長波長の光が発光可能な蛍光物質と、該フリップチップ型半導体発光素子を実装する実装基板と、を有する発光装置において、該フリップチップ型半導体発光素子は、請求項8に記載のフリップチップ型半導体発光素子であることを特徴とする発光装置。
- 10【請求項10】 第1の半導体に、第1の半導体とは異なる導電型を有する第2の半導体を形成する第一の工程と、第一の工程後、第1の半導体に第1の電極を、第2の半導体に第2の電極をそれぞれ設ける第二の工程と、第二の工程後、前記第1及び第2の電極のうち少なくともいずれか一方に開口部分を有するように第1の絶縁保護膜を設け、さらに、前記第1及び第2の半導体のうち少なくとも一部分を覆うように前記第1の絶縁保護膜を設ける第三の工程と、第三の工程後、前記開口部分から前記第1の絶縁保護膜上に延びる前記電極と電気的に接続される第1の導電体を設ける第四の工程と、第四の工程後、前記第1の導電体に第2の導電体を設ける工程であって、前記第2の導電体の一部分には、電気的に接続される接続部を有しており、前記接続部は、前記第1の導電体が接続されている前記電極の半導体に対して、前記第1の導電体が接続されている前記電極の上部とは異なる位置に前記接続部を形成するように、前記第2の導電体の他の一部分を前記第1の導電体に設ける第五の工程と、第五の工程後、前記第1の導電体が接続されている前記電極の上部を覆う第2の絶縁保護膜を設ける第六の工程と、を少なくとも有するフリップチップ型半導体素子の製造方法。
- 11【請求項11】 第1の半導体に、第1の半導体とは異なる導電型を有する第2の半導体を形成する第一の工程と、第一の工程後、第1の半導体に第1の電極を、第2の半導体に第2の電極をそれぞれ設ける第二の工程と、第二の工程後、前記第1及び第2の電極のそれぞれに開口部分を有するように第1の絶縁保護膜を設け、さらに、前記第1及び第2の半導体のうち少なくとも一部分を覆うように前記第1の絶縁保護膜を設ける第三の工程と、第三の工程後、前記開口部分から前記第1の絶縁保護膜上に延びる前記電極と電気的に接続される第1の導電体を設ける第四の工程と、第四の工程後、前記第1の導電体に第2の導電体を設ける工程であって、前記第2の導電体の一部分には、電気的に接続される接続部を有しており、前記接続部は、前記第1の導電体が接続されている前記電極の半導体に対して、前記第1の導電体が接続されている前記電極の上部とは異なる位置に前記接続部を形成するように、前記第2の導電体の他の一部分を前記第1の導電体に設ける第五の工程と、第五の工程後、前記第1及び第2の電極のそれぞれの上部を覆う第2の絶縁保護膜を設ける第六の工程と、を少なくとも有するフリップチップ型半導体素子の製造方法。
- 12【請求項12】 前記第六の工程において、前記第1及び第2の電極のそれぞれの上部を少なくとも覆うように第2の絶縁保護膜を設け、さらに、前記第2の絶縁保護膜の上面と前記接続部の上面とは、ほぼ同一平面になるように前記第2の絶縁保護膜を成形することを特徴とする請求項10又は11のいずれかに記載のフリップチップ型半導体素子の製造方法。
- 13【請求項13】 前記第六の工程において、前記第1及び第2の電極のそれぞれの上部を覆う第2の絶縁保護膜を設け、さらに、前記第2の絶縁保護膜の上面と前記接続部の上面とは、ほぼ同一平面になるように前記第2の絶縁保護膜及び前記接続部のうち少なくともいずれか一方を切削することを特徴とする請求項10又は12のいずれかに記載のフリップチップ型半導体素子の製造方法。
- 14【請求項14】 請求項10乃至13のいずれか一項に記載のフリップチップ型半導体素子の製造方法は、フリップチップ型半導体発光素子の製造方法であることを特徴とするフリップチップ型半導体発光素子の製造方法。
- 15【請求項15】 フリップチップ型半導体発光素子を実装基板に実装し、該フリップチップ型半導体発光素子を該フリップチップ型半導体発光素子からの光の一部を吸収してそれよりも長波長の光が発光可能な蛍光物質で覆う、発光素子の製造方法において、該フリップチップ型半導体発光素子は、請求項14のフリップチップ型半導体発光素子の製造方法により製造されたものであることを特徴とする発光装置の製造方法。
Independent claims15
186 paragraphs in 1 section, as filed
Description: TECHNICAL FIELD [Detailed description of the invention]
【0001】
[Technical field to which the invention belongs]
The present invention relates to a flip-chip type semiconductor device, mainly a flip-chip type semiconductor photoelectric conversion element, more specifically, a flip-chip type semiconductor light emitting device, and a method for manufacturing the same. These are used for liquid crystal backlights, lighting light sources, various indicators, traffic signal lights, and the like. The present invention also relates to a long wavelength conversion type light emitting device having a semiconductor light emitting device and a fluorescent substance capable of emitting light having a longer wavelength than the semiconductor light emitting device.
【0002】
[Conventional technology]
In recent years, light emitting devices using nitride compound semiconductors have been attracting attention as light emitting devices capable of emitting blue light. Further, a light emitting diode (LED) capable of emitting white light by absorbing at least a part of blue light emitted from this blue light emitting element and arranging a phosphor or the like capable of emitting yellow light can be used. Attention has been paid.
【0003】
In the light emitting element used in such a light emitting device, an n-type semiconductor layer is grown on a substrate, and a p-type semiconductor layer is grown on the n-type semiconductor layer directly or via an active layer (light emitting layer). It has a layered structure. Further, in other light emitting elements configured by using a substrate which is an insulator, unlike other light emitting elements configured by using a conductive semiconductor substrate, a semiconductor layer in which the positive electrode and the negative electrode are on the same surface side. Formed on top. That is, the positive electrode on the p-side is formed on the p-type semiconductor layer, and the negative electrode on the n-side removes the p-type semiconductor layer (including the light emitting layer in the case of having a light emitting layer) by etching at a predetermined position. It is formed by exposing the upper surface of the n-type semiconductor layer.
【0004】
In such a compound semiconductor light emitting device, positive and negative electrodes are usually formed on the same surface side, and therefore, in order to prevent a short circuit between the positive and negative electrodes, a take-out portion of the positive and negative electrodes (connection with the electrode of the mounting substrate). Except for the portion), an insulating protective film is formed, and the electrode surface is turned up or down and mounted on a mounting substrate for use.
【0005】
For such a compound semiconductor light emitting device and a light emitting device in which the compound semiconductor light emitting device is mounted on a mounting substrate, for example, Japanese Patent Application Laid-Open No. 2001-44498 is published and Japanese Patent Application No. 2001-53511 is filed. This will be described with reference to FIGS. 6 to 8. These semiconductor light-emitting elements are of the flip-chip type, have a structure in which a semiconductor layer is laminated on a substrate and electrodes are formed on the semiconductor layer. After molding the semiconductor light-emitting element, the front and back sides are reversed and mounted on a mounting substrate. To do. In order to go through such a process, the vertical relationship will be described as laminating a semiconductor layer on the upper surface of the substrate and forming an electrode on the upper surface thereof, and the vertical relationship of FIGS. 6 to 8 will be described upside down.
【0006】
In the conventional semiconductor light emitting device 300, positive and negative electrodes 104 and 105 are formed on the same surface side with respect to the substrate 101. FIG. 6 shows a cross-sectional view of the conventional semiconductor light emitting device 300. In the semiconductor light emitting element 300 shown in FIG. 6, an n-type semiconductor layer 102 is laminated on a substrate 101, a p-type semiconductor layer 103 is laminated on the upper surface thereof, and an n-type electrode 104 is formed on the upper surface of the n-type semiconductor layer 102 to form a p-type. A p-type electrode 105 is formed on the upper surface of the semiconductor layer 103. The mounting substrate 115 on which the semiconductor light emitting device 300 is mounted is formed with a negative electrode 113 connected to the n-type electrode 104 and a positive electrode 114 connected to the p-type electrode 105. A conductive adhesive 111 is used to connect the n-type electrode 104 and the negative electrode 113, and a conductive adhesive 112 is used to connect the p-type electrode 105 and the positive electrode 114. .. However, when the semiconductor light emitting element 300 is mounted on the mounting substrate 115 with the front and back sides reversed, that is, the electrode side facing down, the conductive adhesive 111,112 is sandwiched between the positive and negative electrodes 104 and 105 formed on the same side. Has a problem that it protrudes in the lateral direction and short-circuits between the electrodes. In this way, in order to prevent short circuits between the positive and negative electrodes during manufacturing, it is necessary to strictly control the amount, viscosity, etc. of the conductive adhesive, which has been a cause of increasing the manufacturing cost. Therefore, in order to solve this problem, the semiconductor light emitting device 310 described in JP-A-2001-44498 (hereinafter referred to as "Reference 1") has been invented.
【0007】
In the semiconductor light emitting device 310 described in Reference 1, positive and negative electrodes 104 and 105 are formed on the same surface side with respect to the substrate 101. FIG. 7 shows a cross-sectional view of the semiconductor light emitting device 310 described in Reference 1. The description of the same configuration as that of the conventional semiconductor light emitting device 300 will be omitted. In the semiconductor light emitting device 310 of Reference 1, a conductor 106a conducting with the n-type electrode 104 is formed on the insulating protective film 108a outside the opening portion on the n-type electrode 104, and the conductor 106a outside the opening portion on the p-type electrode 105 is formed. A conductor 107a conducting with the p-type electrode is formed on the insulating protective film 108a. The conductor 106a and the conductor 107a are electrically connected to the mounting substrate 115 by using the conductive adhesive 111 and the conductive adhesive 112.
【0008】
The semiconductor light emitting device 320 described in the application specification of Japanese Patent Application No. 2001-53511 (hereinafter referred to as "Reference 2") also has positive and negative electrodes 104 and 105 formed on the same surface side with respect to the substrate 101. There is. FIG. 8 shows a cross-sectional view of the semiconductor light emitting device 320 described in the application specification of Reference 2. The description of the same configuration as that of the conventional semiconductor light emitting device 300 will be omitted. In this semiconductor light emitting device 320, a conductor 106b conducting with the n-type electrode 104 is formed on the upper surface of the n-type electrode 104, and a conductor 107b conducting with the p-type electrode 105 is formed on the upper surface of the p-type electrode 105. ing. The conductor 106b and the conductor 107b are electrically connected to the mounting substrate 115 by using the conductive adhesive 111 and the conductive adhesive 112.
【0009】
[Problems to be Solved by the Invention]
However, the semiconductor light emitting device 310 described in Reference 1 and the semiconductor light emitting device 320 described in the application specification of Reference 2 are excellent in preventing short circuits, but the n-type electrode 104 and the p-type electrode are excellent. If the space between 105 is extremely narrow, the conductive adhesives 111 and 112 will protrude in the lateral direction, making it difficult to prevent short circuits between the positive and negative electrodes. This has been a new issue in reducing the substrate area of the semiconductor light emitting device in the future.
【0010】
Further, in the conventional semiconductor light emitting device 300, the height H3 between the mounting substrate 115 and the lower surface of the substrate 101 (the surface on which the semiconductor layer is not formed) is conductive because the thickness of the semiconductor light emitting element 300 to be manufactured is determined. The height was adjusted by the amount of the sex adhesive 111 and the conductive adhesive 1112. Therefore, it is difficult to adjust the height H3 of the substrate 101 of the semiconductor light emitting device 300. On the other hand, when the height H3 is changed by changing the thickness of the semiconductor light emitting element 300, the thickness of the substrate 101 may be changed, or the thicknesses of the positive electrode 104 and the negative electrode 105 may be changed as appropriate. There is a problem that the number of manufactured parts increases and the manufacturing cost increases. This also applies to the semiconductor light emitting device 310 described in Reference 1 and the semiconductor light emitting device 320 described in the application specification of Reference 2.
【0011】
Therefore, an object of the present invention is to provide a flip-chip type semiconductor device capable of effectively preventing a short circuit between positive and negative electrodes and a method for manufacturing the same. Another object of the present invention is to provide a flip-chip type semiconductor element in which the height of the flip-chip type semiconductor element can be adjusted extremely easily. In particular, the present invention relates to a flip-chip type semiconductor light emitting device used in a light emitting device.
【0012】
[Means for solving problems]
In order to achieve the above object, the flip-chip type semiconductor light emitting element according to the present invention is different from the first semiconductor provided with the first electrode and the first semiconductor formed on the first semiconductor. A second semiconductor provided with a second electrode having a conductive type, a conductor electrically connected to at least one of the first electrode and the second electrode, and the first and second electrodes. A flip-chip type semiconductor element containing at least an insulating protective film provided so as to cover at least a part of the second semiconductor, and the upper portion of the electrode to which the conductor is connected is formed. It is covered with the insulating protective film, and a part of the conductor has a connecting portion electrically connected, and the connecting portion is connected to the semiconductor of the electrode to which the conductor is connected. On the other hand, the present invention relates to a flip-chip type semiconductor element in which the connecting portion is formed at a position different from the upper portion of the electrode to which the conductor is connected. Hereinafter, the flip-chip type semiconductor element will be described as a flip-chip type semiconductor light emitting element, but the present invention is not limited thereto. In Reference 1, conductors 106a and 107a are provided on the semiconductor light emitting element 310 above the positive and negative electrodes 104 and 105, and positive and negative electrodes 113 and 114 of the mounting substrate 115 are provided so as to face the conductors 106a and 107a. .. That is, no insulator is provided on the straight line connecting the positive and negative electrodes 104 and 105, the conductors 106a and 107a, and the positive and negative electrodes 113 and 114. When an insulator is provided between the positive and negative electrodes 104 and 105 and the positive and negative electrodes 113 and 114, between the positive and negative electrodes 104 and 105 and the positive and negative electrodes 113 and 114. Since no current flows through it, it does not function as a semiconductor light emitting element. The same applies to Reference 2. On the other hand, the present invention has a configuration different from that of the prior art by adopting the above configuration, and exhibits an extremely advantageous effect. FIG. 1A is an AA cross-sectional view of the flip-chip type semiconductor device according to the present invention. FIG. 1 (b) shows the flip-chip type semiconductor light emitting device according to the present invention above. The schematic view seen from is shown. In FIG. 1, conductors are provided on both the first electrode and the second electrode, but in the present invention, if a conductor is provided on either one of the first electrode and the second electrode. Good. For convenience, the conductor is mainly provided on the first electrode, but the same effect is exhibited when the conductor is provided only on the second electrode. The flip-chip type semiconductor element 200 according to the present invention is provided with a conductor 6 electrically connected to the first electrode 4, and a connecting portion 6c electrically connected to a part of the conductor 6 is provided. The connecting portion 6c is formed at a position different from the upper part of the first electrode 4. Further, the upper portion 9 of the first electrode 4 is covered with an insulating protective film 8 which is an insulating material. Therefore, the first electrode 13 provided on the mounting substrate 15 does not exist in the upper portion 9 of the first electrode 4, but exists at a position different from the upper portion 9 of the first electrode 4. For this reason, the configuration is different from that of the prior art. Further, since the connecting portion 6c exists at a position different from the upper portion 9 of the first electrode 4, for example, the second electrode 5 and the second electrode 5 are located between the first electrode 4 and the second electrode 5. By widening the space between the connection portion 6c, it is possible to extremely effectively prevent a short circuit between the electrodes due to the protrusion of the conductive adhesives 11 and 12 at the connection portion between the flip-chip type semiconductor element 100 and the mounting substrate 15. it can. For this reason, the present invention has extremely important significance because the configuration and effect are different from those of the prior art. .. Further, the upper portion 9 of the first electrode 4 is covered with an insulating protective film 8 which is an insulating material. Therefore, the first electrode 13 provided on the mounting substrate 15 does not exist in the upper portion 9 of the first electrode 4, but exists at a position different from the upper portion 9 of the first electrode 4. For this reason, the configuration is different from that of the prior art. Further, since the connecting portion 6c exists at a position different from the upper portion 9 of the first electrode 4, for example, the second electrode 5 and the second electrode 5 are located between the first electrode 4 and the second electrode 5. By widening the space between the connection portion 6c, it is possible to extremely effectively prevent a short circuit between the electrodes due to the protrusion of the conductive adhesives 11 and 12 at the connection portion between the flip-chip type semiconductor element 100 and the mounting substrate 15. it can. For this reason, the present invention has extremely important significance because the configuration and effect are different from those of the prior art. .. Further, the upper portion 9 of the first electrode 4 is covered with an insulating protective film 8 which is an insulating material. Therefore, the first electrode 13 provided on the mounting substrate 15 does not exist in the upper portion 9 of the first electrode 4, but exists at a position different from the upper portion 9 of the first electrode 4. For this reason, the configuration is different from that of the prior art. Further, since the connecting portion 6c exists at a position different from the upper portion 9 of the first electrode 4, for example, the second electrode 5 and the second electrode 5 are located between the first electrode 4 and the second electrode 5. By widening the space between the connection portion 6c, it is possible to extremely effectively prevent a short circuit between the electrodes due to the protrusion of the conductive adhesives 11 and 12 at the connection portion between the flip-chip type semiconductor element 100 and the mounting substrate 15. it can. For this reason, the present invention has extremely important significance because the configuration and effect are different from those of the prior art.
【0013】
Further, by providing the conductor 6 at a position different from the upper portion 9 of the first electrode 4, the conductor 6 is connected to the first electrode 13 of the mounting substrate 15 regardless of the position where the first electrode 4 is provided. be able to. In the conventional semiconductor light emitting device, the positions of the electrodes provided on the substrate differ depending on the size of the substrate. Due to the different positions of the electrodes, it was necessary to change and manufacture the pattern of the connection portion of the mounting substrate, which led to an increase in manufacturing cost. However, in the present invention, the conductor can be provided at a desired position regardless of the size of the substrate and the position of the electrodes. As a result, even when flip-chip type semiconductor elements having different sizes of the substrate 1 are used, it is not necessary to change the pattern of the connection portion of the mounting substrate. Therefore, the flip-chip type semiconductor elements having different sizes of the substrate 1 are used. Even in this case, the connection portion of the mounting substrate can be patterned, various flip-chip type semiconductor elements can be attached, and the manufacturing cost can be reduced. The semiconductor device of the present invention is a flip chip type. Flip-chip or flip-chip bonding is a type of wireless bonding in which a protruding electrode called a bump is formed on an electrode on the surface of a semiconductor chip, and the front and back of the chip are reversed to form an electrode on a wiring board such as ceramic. It refers to a mounting method in which bumps are aligned and connected by face-down bonding.
【0014】
In the present invention, a first semiconductor provided with a first electrode and a second semiconductor formed on the first semiconductor and provided with a second electrode having a conductive type different from that of the first semiconductor. A conductor electrically connected to each of the first electrode and the second electrode, and an insulating protective film provided so as to cover at least a part of the first and second semiconductors. Is a flip-chip type semiconductor element containing at least in the configuration, the upper portion of the electrode to which the conductor is connected is covered with the insulating protective film, and a part of the conductor is electrically connected. The connecting portion is located at a position different from the upper part of the electrode to which the conductor is connected with respect to the semiconductor of the electrode to which the conductor is connected. The flip-chip type semiconductor element in which the connecting portion is formed and the distance between the corresponding connecting portions is wider than the distance between the corresponding first and second electrodes. By adopting the above configuration, it is possible to prevent short circuits between the electrodes extremely effectively. Specifically, conductors are provided in each of the first and second electrodes, and the distance between the first and second conductors is wider than that between the first and second electrodes. However, short circuits between the electrodes can be prevented extremely effectively.
【0015】
The connecting portion and the insulating protective film provided on the side where the second semiconductor is formed on the first semiconductor, and the upper surface of the connecting portion and the upper surface of the insulating protective film are substantially in the same plane. Is preferable. As a result, it is possible to improve the grounding stability when bonding the flip-chip type semiconductor element to the mounting substrate or the like.
【0016】
The insulating protective film is composed of a first insulating protective film and a second insulating protective film, and the first insulating protective film includes the electrode portion excluding a portion connected to the conductor and the electrode portion. The first and second semiconductors are provided so as to cover at least a part thereof, and the second insulating protective film is provided so as to cover the upper part of the electrode to which the conductor is connected. Is preferable. This is because the conductor can be stretched to a position different from the upper part of the electrode to which the conductor is connected, and the position of the connecting portion of the conductor can be appropriately changed. For example, it is desirable to stretch the conductor in the direction of increasing the distance between the electrode to which the conductor is connected and the electrode different from the electrode, but the conductor may be formed in the direction of narrowing the distance. In order to form a conductor at a position facing the electrode of the mounting substrate, the position of the conductor can be appropriately changed.
【0017】
It is preferable that at least one of the insulating protective film, the first insulating protective film and the second insulating protective film contains at least AlN and polysilazane. This makes it possible to obtain a light emitting element having high luminous efficiency, reliability, and color purity. These are most preferably a combination of AlN and polysilazane, but other inorganic materials may be combined with polysilazane, and further, they may be formed using a commonly used permeable mold member.
【0018】
The conductor is composed of a first conductor and a second conductor, and the first conductor is formed on the first insulating protective film, and the second conductor is formed. It is preferable that one part of the body is electrically connected to the first conductor, and the other part of the second conductor is formed with a connecting part. This makes it possible to adopt the manufacturing method described in detail later, and the flip-chip type semiconductor element can be manufactured more easily.
【0019】
The thickness of the flip-chip type semiconductor element is preferably 10 to 200 μm. More preferably, it is 50 to 150 μm. This is because by making the flip-chip type semiconductor element thinner, the light emitting device on which the flip-chip type semiconductor light emitting element is mounted can be made thinner.
【0020】
The flip-chip type semiconductor element is preferably a flip-chip type semiconductor light emitting element. In the flip-chip type semiconductor light emitting element, the electrode portion is not shaded with respect to the light emitting portion, and the entire surface of the semiconductor layer is emitted, so that the emission output can be improved.
【0021】
The present invention comprises a flip-chip type semiconductor light emitting device, a fluorescent material capable of absorbing a part of light from the flip chip type semiconductor light emitting device and emitting light having a longer wavelength than that, and the flip chip type semiconductor light emitting device. In a light emitting device having a mounting substrate on which the element is mounted, the flip chip type semiconductor light emitting device relates to the light emitting device which is the flip chip type semiconductor light emitting device according to claim 8. By adjusting the thickness of the flip-chip type semiconductor element, it is possible to provide a light emitting device in which the flip-chip type semiconductor light emitting element having a desired height is incorporated. This makes it possible to eliminate the step of adjusting the height of the light emitting element by soldering or the like when mounting the light emitting element on the mounting substrate. Further, a thin light emitting device can be provided.
【0022】
In the present invention, a first step of forming a second semiconductor having a conductive type different from that of the first semiconductor on the first semiconductor, and after the first step, a first electrode is attached to the first semiconductor. , The second step of providing the second conductor to the second semiconductor, and after the second step, the first insulation so as to have an opening portion in at least one of the first and second electrodes. A third step of providing the protective film and further providing the first insulating protective film so as to cover at least a part of the first and second semiconductors, and after the third step, the first from the opening portion. A fourth step of providing a first conductor electrically connected to the electrode extending on the insulating protective film of 1, and after the fourth step, a second conductor is provided on the first conductor. In the step, a part of the second conductor has a connecting portion electrically connected, and the connecting portion is a semiconductor of the electrode to which the first conductor is connected. On the other hand, the other part of the second conductor is the first conductor so as to form the connection portion at a position different from the upper part of the electrode to which the first conductor is connected. A flip tip having at least a fifth step of providing a second insulating protective film covering the upper part of the electrode to which the first conductor is connected, and a sixth step of providing a second insulating protective film after the fifth step. The present invention relates to a method for manufacturing a type semiconductor element. As a result, the conductor connection portion conventionally formed on the upper part of the electrode can be formed at a position different from that on the upper part of the electrode. As a result, it is possible to effectively prevent a short circuit that has occurred between different electrodes in one flip-chip type semiconductor element.
【0023】
Further, in Reference 2, a conductor is formed on the upper surface of the electrode of the light emitting element. In Reference 1, a conductor extending outward from the upper surface of the electrode of the light emitting element is formed. In any of the references, the shortest path between the conductor and the electrode of the mounting substrate is a path extending vertically upward from the upper surface of the conductor to the electrode of the mounting substrate. On the other hand, in the present invention, the first insulating protective film is formed on the upper part of the electrode of the flip-chip type semiconductor element, and the conductor is placed at a position different from the upper part of the electrode of the flip-chip type semiconductor element. It is formed and electrically connected to the electrodes of the mounting substrate. That is, forming a conductor that conducts from a position different from the upper part of the electrode of the flip-chip type semiconductor element to the electrode of the mounting substrate is a configuration not found in the prior art. By adopting this configuration, it has the effect of effectively preventing short circuits. Further, conventionally, when the position of the conductor formed on the light emitting element is changed, it is necessary to change the position of the electrode of the mounting substrate facing the conductor, so that a new mounting substrate must be manufactured. .. On the other hand, by using the manufacturing method of the present invention, the electrode arrangement of the mounting substrate on which the flip-chip type semiconductor element is mounted is opposed to the position of the electrode provided on the flip-chip type semiconductor element. , The position of the conductor of the flip-chip type semiconductor element can be appropriately changed and arranged. That is, when changing the electrode position of the flip-chip type semiconductor element, it is not necessary to change the arrangement of the electrodes of the mounting board, and it is not necessary to newly manufacture the mounting board, so that the manufacturing cost can be reduced.
【0024】
In the present invention, a first step of forming a second semiconductor having a conductive type different from that of the first semiconductor on the first semiconductor, and after the first step, a first electrode is attached to the first semiconductor. , A second step of providing the second electrode to the second semiconductor, and after the second step, a first insulating protective film is provided so that each of the first and second electrodes has an opening portion. Further, a third step of providing the first insulating protective film so as to cover at least a part of the first and second semiconductors, and after the third step, the first insulating protection from the opening portion. A fourth step of providing a first conductor electrically connected to the electrode extending on the film, and a step of providing a second conductor on the first conductor after the fourth step. A part of the second conductor has a connecting portion that is electrically connected, and the connecting portion is connected to the semiconductor of the electrode to which the first conductor is connected. A fifth conductor is provided with another portion of the second conductor so that the connecting portion is formed at a position different from the upper part of the electrode to which the first conductor is connected. The present invention relates to a method for manufacturing a flip-chip type semiconductor element having at least a second step of providing a second insulating protective film covering the upper portions of the first and second electrodes after the fifth step. .. It is preferable that the distance between the conductors electrically connected to each of the first electrode and the second electrode is wider than the distance between the first electrode and the second electrode. As a result, the short circuit that has occurred between the first electrode and the second electrode can be prevented extremely effectively. Specifically, conductors are provided in each of the first and second electrodes, and the distance between the first and second conductors is wider than that between the first and second electrodes. However, short circuits between the electrodes can be prevented extremely effectively. In addition, since the number of conductors formed on the flip-chip type semiconductor element is two, the degree of freedom in the mounting position of the flip-chip type semiconductor element when mounting on the electrode of the mounting substrate is higher than when the number of conductors is one. Can be increased.
【0025】
In the sixth step, a second insulating protective film is provided so as to cover at least the upper portions of the first and second electrodes, and further, the upper surface of the second insulating protective film and the upper surface of the connecting portion are provided. It is preferable to mold the second insulating protective film so as to have substantially the same plane. As a result, it is possible to improve the grounding stability when the flip-chip type semiconductor element is mounted on the mounting substrate.
【0026】
In the sixth step, a second insulating protective film is provided to cover the upper portions of the first and second electrodes, and the upper surface of the second insulating protective film and the upper surface of the connecting portion are formed on each other. It is preferable to cut at least one of the second insulating protective film and the connecting portion so as to have substantially the same plane. A second insulating protective film is provided in a slightly excessive amount so as to cover the entire upper part of the first semiconductor, the second semiconductor, the first electrode, the second electrode, the first insulating protective film, etc. Then, since the upper part of the second insulating protective film may be cut, the molding process can be performed more easily. Further, the thickness of the flip-chip type semiconductor element can be adjusted by cutting the upper surface of the second insulating protective film. Further, by cutting both the second insulating protective film and the connecting portion, the conductor portion can be easily exposed from the upper surface of the second insulating protective film, and the electrode of the mounting substrate is electrically connected. The connection can be made even easier.
【0027】
The method for manufacturing a flip-chip semiconductor device according to any one of claims 10 to 13 is preferably a method for manufacturing a flip-chip semiconductor light emitting device. This makes it possible to provide a method for manufacturing a flip-chip type semiconductor light emitting device, which is in great demand in the market.
【0028】
In the present invention, a flip-chip type semiconductor light emitting device is mounted on a mounting substrate, and the flip chip type semiconductor light emitting device absorbs a part of the light from the flip chip type semiconductor light emitting device to emit light having a longer wavelength. In the method for manufacturing a light emitting device covered with a luminescent fluorescent substance, the flip-chip type semiconductor light emitting device is manufactured by the method for manufacturing the flip chip type semiconductor light emitting device according to claim 14. Regarding the manufacturing method of the device. As a result, it is possible to provide a light emitting device that is in great demand in the market. From the above, the present invention can provide a flip-chip type semiconductor element capable of extremely effectively preventing a short circuit between positive and negative electrodes and a method for manufacturing the same. It is possible to provide a mounting substrate on which the flip-chip type semiconductor light emitting device is mounted and a method for manufacturing the same. Further, it is possible to provide a flip-chip type semiconductor element in which the thickness of the flip-chip type semiconductor element can be adjusted extremely easily. Further, it is possible to provide a flip-chip type semiconductor element that can appropriately cope with a change in the electrode position provided on the mounting substrate. In addition, when the light emitting element is mounted on the mounting substrate, it is possible to improve the grounding stability and the light emitting performance at the same time. The present invention has extremely important technical significance as described above.
【0029】
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a flip-chip type semiconductor element, a light emitting device, and a method for manufacturing the same according to the present invention will be described with reference to embodiments and examples. However, the present invention is not limited to this embodiment and examples.
【0030】
The flip-chip type semiconductor element according to the present invention is preferably a flip-chip type semiconductor light emitting element, but can also be applied to a laser element, a photo element, an optical element such as a solar cell, a transistor, and the like. As an example, the flip-chip type semiconductor element according to the present invention will be described as being a flip-chip type semiconductor light emitting device and a light emitting device in which the flip chip type semiconductor light emitting device is mounted on a mounting substrate, but the present invention is not limited thereto. FIG. 1A shows an AA cross-sectional view of the flip-chip type semiconductor light emitting device 200 according to the present invention. FIG. 1B shows a schematic view of the flip-chip type semiconductor light emitting device 200 according to the present invention as viewed from above. FIG. 2 shows a method of manufacturing the flip-chip type semiconductor element 200 according to the present invention. Hereinafter, it will be described with reference to the drawings. However, after the flip-chip type semiconductor light emitting device 200 is manufactured, the front and back sides are reversed and mounted on the mounting substrate 15. However, in order to explain the manufacturing method of the flip chip type semiconductor light emitting device 200 as well, FIG. 1 (a) is shown. , The mounting substrate 15 is shown above the flip-chip type semiconductor light emitting device 200. The substrate 1, the first semiconductor 2, the active layer (light emitting layer) (not shown because it is extremely thin), and the second semiconductor 3 are formed in this order from the bottom. The first semiconductor 2 is provided with the first electrode 4, and the second semiconductor 3 is provided with the second electrode 5. At least a part of the outer circumference of the first semiconductor 2, the second semiconductor 3, the first electrode 4 and the second electrode 5 is covered with the first insulating protective film 8a. The first insulating protective film 8a is formed so that the upper surface of the first electrode 4 and the upper surface of the second electrode 5 serve as openings. The conductor 6 is electrically connected to the upper surface of the first electrode 4 which is not covered with the first insulating protective film 8a. The conductor 6 is composed of a first conductor 6a and a second conductor 6b, and the first conductor 6a is connected to the first electrode 4. Similarly, the conductor 7 or the conductor 7 is electrically connected to the opening of the second electrode 5 which is not covered with the first insulating protective film 8a, and the conductor 7 is connected to the first conductor 7a. It is composed of a second conductor 7b, and the first conductor 7a is a second electrode 5 It is connected to the. The upper portion 9 of the first electrode 4 and the upper portion 10 of the second electrode 5 are covered with the second insulating protective film 8b. The flip-chip type semiconductor light emitting device 200 having such a configuration has the second conductor 6b and the second conductor 7b, and the first electrode 13 and the second electrode 14 of the mounting substrate 15 turned upside down. (In FIG. 1 (a), the mounting substrate 15 is shown above the flip-chip type semiconductor light emitting device 200). The substrate 1 covers almost the entire surface of the substrate 1 with a fluorescent substance on the surface opposite to the back surface on which the mounting substrate 15 is mounted.
【0031】
Hereinafter, each configuration of the present invention will be described in detail. Hereinafter, the flip-chip type semiconductor light emitting device 200 is simply referred to as a semiconductor device 200. Nitride semiconductor (In) as a semiconductor element 200 capable of emitting visible light with high emission brightness with high efficiency.<sub>x</sub>Ga<sub>y</sub>Al<sub>1-xy</sub>Those using N, 0 x 1, 0 y 1) as the active layer are preferably mentioned. Since the semiconductor element 200 outputs light from the front surface opposite to the back surface on which the first semiconductor 2 is provided, the substrate 1 is preferably translucent. However, in the case of a semiconductor element such as a transistor whose main purpose is not to emit light, an insulating substrate having no translucency may be used. The light emitting element 200 using a nitride semiconductor is a sapphire substrate and spinel (MgAi).<sub>2</sub>O<sub>4</sub>) Although it can be formed on a substrate, SiC, a GaN single crystal, etc., it is preferable to use a sapphire substrate in order to satisfy mass productivity and crystallinity. The first semiconductor 2 preferably uses an n-type semiconductor layer, and the second semiconductor 3 preferably uses a p-type semiconductor layer. However, the first semiconductor 2 uses a p-type semiconductor layer, and the first semiconductor 2 has a p-type semiconductor layer. The semiconductor 3 of 2 may use an n-type semiconductor layer, and may have other different conductive types such as i-type. In the embodiment of the present invention, the first semiconductor 2 uses an n-type nitride semiconductor layer, and the second semiconductor 3 uses a p-type nitride semiconductor layer, which is an insulating substrate. These semiconductor layers are laminated on the sapphire substrate 1. The first semiconductor 2 is preferably formed on almost the entire surface except for a portion for forming the first insulating protective film 8a and the first and second conductors 6a and 7a on the substrate 1. This is because by forming the first insulating protective film 8a and the first and second conductors 6a and 7a on the substrate 1, it is possible to improve the adhesion stability to these substrates. However, the first semiconductor may be formed on almost the entire surface of the substrate 1. It is preferable that the second semiconductor 3 is formed on almost the entire surface of the first semiconductor 2 except for the first electrode 4 from the viewpoint of luminous efficiency. Both the first semiconductor 2 and the second semiconductor 3 may be those in which two or more types of semiconductor layers having different compositions are laminated.
【0032】
The first electrode 4 is provided on the n-type first semiconductor 2. The first electrode 4 is not particularly limited as long as it is an electrode material capable of ohmic contact with an n-type nitride semiconductor. For example, one or more kinds of metal materials such as Ti, Al, Ni, Pt, Pd, Rh, Cu, Au, W, V, InO2-SnO can be used, but Ti, W and V are used as bases, respectively. It is preferable to have a multilayer structure such as Ti / Al, W / Al / W / Au, W / Al / W / Pt / Au, and V / Al. By using an electrode material that can make ohmic contact with the n-type nitride semiconductor 2, V<sub>f</sub>Can be reduced. In particular, SiO on the insulating protective film 8<sub>2</sub>When is used, it is preferable to use Ti, Al, and Ni for the first electrode 4 from the viewpoint of adhesion. The film thickness of the first electrode 4 can be 2000 angstroms to 0.1 mm, but is preferably 5000 angstroms to 1.5 μm.
【0033】
The second electrode 5 is provided on the second semiconductor 2 which is p-type. The second electrode 5 is not particularly limited as long as it is an electrode material capable of ohmic contact with the p-type nitride semiconductor. For example, one or more of Ti, Al, Ni, Pt, Pd, Rh, Cu, Au, W, V, InO2-SnO, Sn, Cr, Co, Ag and the like can be used. Further, the second electrode 5 can be adjusted to be translucent or non-transmissive by adjusting the film thickness according to the mounting form. In the present invention, since the light emitting output is obtained from the surface of the substrate 1, the second electrode 5 may be a translucent one. The film thickness is set to 10 angstroms to 500 angstroms, preferably 10 angstroms to 200 angstroms in order to obtain translucency. However, 2000 angstrom ~ 0.1 mm can also be used.
【0034】
The conductor 6 is connected to the first electrode 4, and the conductor 7 is connected to the second electrode 5. The conductor 6 is preferably composed of the first conductor 6a and the second conductor 6b, but may be integrally molded. It is preferable that the first conductor 6a is formed on the first insulating protective film 8a and extends outward from the upper part of the first electrode 4. A second conductor 6b, which is electrically connected, is formed on the first conductor 6a extending outward. The second conductor 6b extends to the outer periphery of the semiconductor element 200 in order to electrically connect to the first electrode 13 of the mounting substrate 15. It is connected to the first electrode 13 of the mounting substrate 15 via the connecting portion 6c provided on the second conductor 6b. The conductor 7 also has the same configuration as the conductor 6, but may have a configuration different from that of the conductor 6 depending on the size, performance, and the like of the semiconductor element 200. It is preferable that the upper surfaces of the connecting portion 6c, the connecting portion 7c and the insulating protective film 8 are cut or molded so as to be substantially flush with each other. This is because the grounding stability at the time of mounting on the mounting board 15 can be improved and a highly reliable light emitting device can be obtained. The conductor 6 has a strong adhesive force with the first electrode 4 and the insulating protective film 8, can maintain the adhesive force with the solder or the conductive adhesive for a long period of time, has a low resistance value, and is the present semiconductor element. It is required that the conductor 6 rarely penetrates the defect of the insulating protective film 8 and short-circuits to a different conductive type semiconductor due to the ion migration phenomenon during operation. In order to satisfy these, the conductor 6 is composed of one or more metal films. The conductor 7 is the same as the conductor 6. As the material of the conductor 6, a metal material containing Ti, Cr, Al, Zr, Mo, W, Hf, Ni, Au, Pt and the like as main components can be used, but when Au and Pt are used, each electrode can be used. It is possible to obtain a conductor having excellent adhesion and conductivity. The metal material is pressure-bonded and formed on the first electrode 4 by a bonding apparatus. The first conductor 6a is melted and pressure-bonded onto the first insulating protective film 8a. Also crimped By adjusting the state, the shape of the side surface of the conductor 6 can be adjusted to the shape of wear. In addition to pressure bonding, fixing means such as sputter vapor deposition can also be used. The side surface of the conductor 6 is preferably tapered, and the light emitted from the fluorescent substance 16 in the translucent mold member and the light emitting element is satisfactorily reflected and scattered on the side surface to improve the light extraction efficiency. Can be made to. The conductor 7 is the same as the conductor 6.
【0035】
It is preferable that the conductor 6, particularly the second conductor 6b, is electrically connected to the first electrode 4 by using a plating means. As the plating material, the above-mentioned metal materials can be used, but electroless plating materials and the like can be used from general electroplating materials such as Ni, Al, Au, and Pt. As the plating means, electroplating means and electroless plating means can be used. In particular, electroless Ni-plating is preferable in the semiconductor element 200 using the insulating substrate 1 from the viewpoints of eliminating the need for electrical contacts, plating uniformity, precipitation rate, solder wettability, strength, corrosion resistance, and the like. The height of the second conductor 6b can be appropriately changed as desired, but is preferably 5 to 200 μm, particularly preferably in the range of 20 to 100 μm. Further, the second conductor 6b may have a two-layer structure in which electroless Au plating is provided on electroless Ni plating. For example, it is preferable to form the electroless Ni plating at a height of 5 to 100 μm and to form the electroless Au plating on the electroless Ni plating at a height of 5000 angstroms or less because the bondability is good. As a result, the side surface of the second conductor 6b is tapered, and the second conductor 6b is formed by the electroless Ni plating means so that the second conductor 6b is substantially flush with the second conductor 7b with respect to the substrate 1. Adjust the height as shown. The connecting portion 6c, which is the upper portion of the second conductor 6a, preferably has a desired area because it is electrically connected to the first electrode 13 of the mounting substrate 15. Therefore, when the tapered shape is formed, it is preferable to provide an inclination so that the area of the connecting portion 6c is wider than the area of the connecting portion between the second conductor 6b and the first conductor 6a. The conductor 7 is the same as the conductor 6. The conductor 7b forms the second conductor 7b so as to have the connecting portion 7c above the first conductor 7a provided above the second electrode 5.
【0036】
The insulating protective film 8 mainly prevents short circuits between positive and negative electrodes, and in order to protect it from external factors such as mechanical, thermal stress, and humidity, the first semiconductor 2, the second semiconductor 3, and the like. It is preferable to provide the first electrode 4 and the second electrode 5 so as to cover the first electrode 4 and the second electrode 5. The insulating protective film 8 also has a role as a sealing material. The first insulating protective film is provided so as to cover the first electrode 4 and the second electrode 5 of the portion excluding the portion connecting to the conductor 6 and the conductor 7 as an opening. The insulating protective film 8 is composed of a first insulating protective film 8a and a second insulating protective film 8b, and the same material may be used in order to improve adhesion, but different materials are used in terms of function. You may. When the second insulating protective film 8b is formed so as to cover the upper surface or the side surface of each electrode, it is preferable that the second insulating protective film 8b can be prevented from peeling off from the underlying layer in contact with each electrode. The material of the insulating protective film is not particularly limited as long as it has good transmittance at the main wavelength and good adhesion to the first electrode 4 and the second electrode 5. Further, it is preferable to use a material that cuts light in a short wavelength region. For example, glass compositions such as alkaline silicate glass, soda-lime glass, lead glass, barium glass, Si.<sub>2</sub>N<sub>4</sub>, Or SiO<sub>2</sub>, TiO<sub>2</sub>, GeO<sub>2</sub>, ZrO<sub>2</sub>And Ta<sub>2</sub>O<sub>5</sub>Oxides such as are preferably formed. The film thickness of the insulating protective film 8 is not particularly limited, but it is preferable that the transmittance at the main wavelength is adjusted to 90% or more. In particular, since the second insulating protective film 8b uses a flip-chip type structure, it is preferable to adopt a layer structure using a material having high light reflection such as Ag, Pt, Rh, and Al. In order to form the insulating protective film 8, after forming a predetermined mask, it can be formed by a method such as thin film deposition, sputtering, CVD, PVD, transfer molding method, casting method, immersion method, dropping method and the like. ..
【0037】
The second insulating protective film 8b also serves as a sealing material. The heat generated in the semiconductor element 200 is transferred to the first semiconductor 2, the second semiconductor 3, the fluorescent substance 16, and the like, causing thermal stress and causing a decrease in the reliability of the semiconductor element 200. The heat generated by the semiconductor element 200 is on the ground plane between the semiconductor element 200 and the mounting substrate 15, and the heat generated by the semiconductor element 200 is the conductor 6 and the conductor 7, the first electrode 13 and the second electrode 14. The heat is transferred to the outside and the heat is released to the outside, but it is insufficient. Therefore, the insulating protective film 8, particularly the second insulating protective film 8b, can release the heat generated in the semiconductor element 200 to the outside by containing a filling and sealing material such as a filler material. For the insulating protective film 8, particularly the second insulating protective film 8b, it is preferable to use a material containing at least an inorganic material such as AlN and polysilazane. The white powder of aluminum nitride (AlN) has high thermal conductivity, high light reflectivity, and is not easily deteriorated by light absorption, so that heat dissipation and light emission intensity of the light emitting device can be improved. This is because a material containing an inorganic material such as AlN and polysilazane has good light emission output, is less likely to deteriorate, and has good heat dissipation. However, the filler material is not limited to the material containing an inorganic material and polysilazane, and SiC, BN, AlN, and TiO.<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub>, ZrO<sub>2</sub>It is also possible to use a material containing one or more of the above. In addition to polysilazane, polymer materials such as epoxy resin and polyimide can be used. The fluorescent substance 16 was selected from the group consisting of at least one element selected from Ce-activated YAG-based phosphors (Y, Lu, Sc, La, Gd and Sm) and Al, Ga, and In. A cerium-activated garnet-based phosphor containing at least one element) or the like can be used. In the YAG-based phosphor, a solution prepared by dissolving rare earth elements of Y, Gd, and Ce in an acid at a chemical quantitative ratio is precipitated with oxalic acid. The coprecipitated oxide obtained by firing this and aluminum oxide are mixed to obtain a mixed raw material. Ammonium fluoride is mixed with this as a flux, packed in a crucible, and fired in air at a temperature of 1400 ° C for 170 minutes to obtain a fired product. The fired product can be ball milled in water for washing, separation, drying, and finally through a sieve to form a YAG-based phosphor. Other specific phosphors include nitrogen-containing CaO-Al activated by Eu and / or Cr.<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>Fluorescent materials can be mentioned, but the present invention is not limited thereto.
【0038】
<Manufacturing Method> The manufacturing method of the flip-chip type semiconductor element 200 according to the present invention will be described in detail with reference to FIG. However, the manufacturing method of the flip-chip type semiconductor element according to the present invention is not limited to the following manufacturing methods.
【0039】
First, the first semiconductor 2 is formed on the substrate 1. Since the flip-chip type semiconductor element 200 that does not use the substrate 1 can also be manufactured by the manufacturing method of the present invention, it is omitted. A second semiconductor 3 is formed on the first semiconductor 2 (P1). The method of forming the first semiconductor 2 on the substrate 1 and the method of forming the second semiconductor 3 on the first semiconductor 2 can be laminated and formed by a known semiconductor laminating method or the like. It is not limited to the method. As a known method for laminating semiconductors, a method in which a first semiconductor (n-type semiconductor) 2 is crystal-grown on a substrate 1 is generally used. Methods for crystal growth include melt growth, vapor phase growth, solution growth, and solid phase growth. Two or more different semiconductor layers can be provided on the first semiconductor 2 and the second semiconductor 3. Further, an active layer may be provided between the first semiconductor 2 and the second semiconductor 3. The end portion of the first semiconductor 2 is removed by etching or the like to make the area smaller than that of the substrate 1, but even in this case, the light extraction efficiency from the end portion does not change, so that the power consumption can be reduced. it can. As the etching means, it is preferable to use dry etching means such as reactive ion etching (RIE), reactive ion beam etching (RIBE), and ion milling.
【0040】
The first electrode 4 is provided on the first semiconductor 2. The second electrode 5 is provided on the second semiconductor 3 (P2). The semiconductor and the electrode are provided so as to suppress the peeling between the semiconductor and the electrode. The first electrode 2 removes a part of the second semiconductor 3 by etching to expose the first semiconductor 2. A first electrode 3 is provided on the exposed first semiconductor 2. As an alternative means of providing electrodes on a semiconductor, a conductive layer is provided between the substrate 1 and the first semiconductor 2, or between the first semiconductor 2 and the second semiconductor 3, or around the element. In some cases, metal is applied to the substrate to make the substrate and the semiconductor layer conductive.
【0041】
The first insulating protective film 8a is provided on the first electrode 4, the second electrode 5, the first semiconductor 2 and the second semiconductor 3 (P3). As a method for forming the insulating protective film 8, thermal oxidation, CVD, spin coating method, sputtering and the like are used. A part of the upper surface of the first electrode 4 and the second electrode 5 is covered to form the insulating protective film so that the first insulating protective film 8a is not formed. After that, when the cover is removed, a first insulating protective film 8a having an opening on the first electrode 4 and the second electrode 5 is formed. As a result, a part of the first electrode 4 and the second electrode 5 is not covered with the first insulating protective film 8a and is exposed. Further, after covering the first electrode 4 and the second electrode 5 with the first insulating protective film 8a, a part of the first electrode 4 and the second electrode 5 may be exposed by polishing, cutting or the like. it can. The first insulating protective film 8a is preferably formed until it covers a part of the back surface of the substrate 1. This is to prevent the first semiconductor 2 and the second semiconductor 3 from peeling off from the substrate 1.
【0042】
A first conductor 6a is provided on the first electrode 4 and the second electrode 5 (P4). The first conductors 6a and 7a are electrically connected to the portions of the first electrode 4 and the second electrode 5 that are not covered with the first insulating protective film 8a manufactured in the manufacturing process of P3. Provided in. The first conductors 6a and 7a are provided so that the electrodes and the conductors are not easily peeled off by a fixing means such as a pressure bonding forming method or sputter vapor deposition. The first conductors 6a and 7a are connected to the first electrode 4 and the second electrode 5 by a crimp forming method, and the other part of the first conductors 6a and 7a is placed on the first insulating protective film 8a. Stretch to.
【0043】
The second conductors 6b and 7b are provided on the first conductors 6a and 7a (P5). It is preferable that the second conductors 6b and 7b are formed at positions facing the electrodes 13 and 14 of the mounting substrate 15. As a result, the formation positions of the second conductors 6b and 7b may be changed according to the positions of the electrodes 13 and 14 of the mounting substrate 15, and it is not necessary to change the positions of the electrodes as in the conventional case. The manufacturing cost can be reduced. In the manufacturing process of P5, the second conductors 6b and 7b, which are electrically connected by using a plating means, are provided on a part of the first conductors 6a and 7a. As the plating means, as described above, electroless plating means is preferable. When forming a conductor using the plating means, it is preferable that the side surfaces of the second conductors 6b and 7b have a tapered shape. Therefore, a side wall is provided so as to have a tapered shape, and the second conductor is formed by the plating means. Provide 6b and 7b.
【0044】
A second insulating protective film 8b is provided so as to cover the upper surfaces of the first electrode 4 and the second electrode 5 (P6). Further, a second insulating protective film 8b is provided so as to cover the outer periphery of the second conductors 6b and 7b. It is preferable to mold the second insulating protective film 8b so that the upper surfaces of the connecting portions 6c and 7c of the second conductors 6b and 7b and the upper surface of the second insulating protective film 8b are substantially flush with each other. .. Alternatively, the upper surfaces of the second conductors 6b and 7b and the upper surface of the second insulating protective film 8b are cut by a cutting means such as polishing, and the connecting portions 6c and 7c of the second conductors 6b and 7b are cut. It is preferable that the upper surface and the upper surface of the second insulating protective film 8b are substantially flush with each other. As the cutting means, polishing using a slurry, polishing with fixed abrasive grains, CMP or the like can be used. For final finishing after cutting, CMP performed using a polishing cloth is preferable because the surface roughness can be reduced. After cutting using a cutting means, it is preferable that the upper surfaces of the connecting portions 6c and 7c are Au-plated. This is because when solder is used as the conductive adhesive, the second conductor is protected from the wettability of the solder and deterioration due to oxidation.
【0045】
Through the above steps, the flip-chip type semiconductor element 200 can be manufactured.
【0046】
Further, the flip-chip type semiconductor light emitting device 200 manufactured by the above step is mounted on the mounting substrate 15, and the flip-chip type semiconductor light emitting device 200 absorbs a part of the light from the flip chip type semiconductor light emitting device 200. Cover with a fluorescent substance 16 capable of emitting light having a longer wavelength. This makes it possible to extract light of different wavelengths.
【0047】
Hereinafter, in order to clarify the features of the present invention, a comparative example will be used for description.
【0048】
[Comparative example 1]
FIG. 6 shows a cross-sectional view of the conventional semiconductor light emitting device 300.
【0049】
The semiconductor light emitting device 300 is laminated in the order of the substrate 101, the n-type semiconductor layer 102, and the p-type semiconductor layer 103. The p-type electrode 105 is provided "on the upper surface" of the p-type semiconductor layer 103, and the n-type electrode 104 is provided "on the upper surface" of the n-type semiconductor layer 102. After manufacturing this semiconductor light emitting element 300, the front and back sides are reversed, and the substrate 101 is on the upper side and the p-type electrode 105 and the n-type electrode 104 are on the lower side, and the semiconductor light emitting element 300 is mounted on the mounting substrate 115. A positive electrode 114 provided on the mounting substrate 115 is arranged directly below the p-type electrode 105, and is bonded to the mounting substrate 115 using a conductive adhesive 112. Further, a negative electrode 113 provided on the mounting substrate 115 is arranged directly below the n-type electrode 104, and is bonded to the mounting substrate 115 using a conductive adhesive 111. When the semiconductor light emitting element 300 is mounted on the mounting substrate 115, there is a problem that the conductive adhesive 112 such as solder and the conductive adhesive 111 protrude and short-circuit the electrodes. Since the distance D3 between the conductive adhesive 112 and the conductive adhesive 111 is directly related to the arrangement of the p-type electrode 105 and the n-type electrode 104, the semiconductor light emitting device 300 is miniaturized. So, it has become a very serious problem.
【0050】
Further, the height H3 between the upper surface of the substrate 101 and the mounting substrate 115 was adjusted by the conductive adhesives 111 and 112 such as solder. Therefore, it is necessary to adjust the height of the height H3 of the semiconductor light emitting element 310 and to adjust the inclination so that the upper surface of the substrate 101 is flush with each other, which is not preferable in terms of manufacturing efficiency.
【0051】
[Comparative Example 2]
FIG. 7 shows a cross-sectional view of the semiconductor light emitting device 310 described in Reference 1. However, the description of the parts under almost the same conditions as in Comparative Example 1 will be omitted.
【0052】
The semiconductor light emitting device 310 is provided with a conductor 107a "on the top surface" of the p-type electrode 105 and a conductor 108a "on the top surface" of the n-type electrode 104. The semiconductor light emitting element 310 is mounted on the mounting substrate 115 with the front and back sides reversed. The conductors 107a and 108a are bonded from between the positive electrode 114 and the negative electrode 113 to the outside by the conductive adhesives 112 and 111. In this case as well, as in Comparative Example 1, when the semiconductor light emitting element 310 is mounted on the mounting substrate 115, the conductive adhesive 112 such as solder and the conductive adhesive 111 protrude and short-circuit the electrodes. There was a problem. Since the distance D4 between the conductive adhesive 112 and the conductive adhesive 111 is directly related to the positions of the p-type electrode 105 and the n-type electrode 104, the semiconductor light emitting device 310 is miniaturized. So, it has become a very serious problem. Although it is superior to Comparative Example 1 in that it prevents a short circuit, it is still difficult to prevent a short circuit when the distance between the electrodes of the semiconductor light emitting device 310 is short.
【0053】
Further, when the heights of the p-type electrode 105 and the n-type electrode 104 are different, the substrate 101 is tilted when mounted on the flat mounting substrate 115. It is necessary to adjust the height of the semiconductor light emitting device 320 H4 and to adjust the inclination so that the upper surface of the substrate 101 is flush with each other, which is not preferable in terms of manufacturing efficiency.
【0054】
[Comparative Example 3]
FIG. 8 shows a cross-sectional view of the semiconductor light emitting device 320 described in the application specification of Reference 2. However, the description of the parts under almost the same conditions as in Comparative Example 1 and Comparative Example 2 will be omitted.
【0055】
The semiconductor light emitting device 320 is provided with a conductor 107b "on the top surface" of the p-type electrode 105 and a conductor 108b "on the top surface" of the n-type electrode 104. The semiconductor light emitting element 320 is mounted on the mounting substrate 115 with the front and back sides reversed. The conductors 107b and 108b are bonded to the positive electrode 114 and the negative electrode 113 with conductive adhesives 112 and 111. In this case as well, as in Comparative Examples 1 and 2, when the semiconductor light emitting element 320 is mounted on the mounting substrate 115, the conductive adhesive 112 such as solder and the conductive adhesive 111 protrude and short-circuit the electrodes. There was a problem of letting it. Since the distance D5 between the conductive adhesive 112 and the conductive adhesive 111 is directly related to the positions of the p-type electrode 105 and the n-type electrode 104, the semiconductor light emitting device 320 is miniaturized. So, it has become a very serious problem. Although it is superior to Comparative Example 1 in that it prevents a short circuit, it is still difficult to prevent a short circuit when the distance between the electrodes of the semiconductor light emitting device 320 is short.
【0056】
[Example 1]
Hereinafter, examples of the present invention will be described with reference to FIG. However, the present invention is not limited to the first embodiment.
【0057】
FIG. 1A shows an AA cross-sectional view of the flip-chip type semiconductor element 200 according to the present invention. FIG. 1B shows a schematic view of the flip-chip type semiconductor light emitting device according to the present invention as viewed from above.
【0058】
The n-type semiconductor layer 2 is laminated on the insulating sapphire substrate 1 by the organic metal vapor deposition method (MOCVD method). The sapphire substrate 1 has a thickness of about 50 to 80 μm. The final product obtained by cutting out the sapphire substrate 1 is a rectangular chip having a length of 0.6 to 0.8 mm and a width of 0.8 to 1.0 mm. The following description will be given for one flip-chip type semiconductor light emitting device. A GaN semiconductor layer or the like is used for the n-type semiconductor layer 2. A low-temperature deposition buffer layer (not shown) that alleviates the mismatch of the lattice constant with the nitride semiconductor layer is laminated on the sapphire substrate 1. After laminating the n-type semiconductor layer 2, an active layer (light emitting layer) (not shown) is provided, and the p-type semiconductor layer 3 is laminated on the upper surface of the active layer. A GaN semiconductor layer is used for the p-type semiconductor layer 3. However, the n-type semiconductor layer 2 or the p-type semiconductor layer 3 may be composed of not only the composition of 1 but also two or more, or may be formed of two or more layers. The film thickness of the semiconductor layers of the n-type semiconductor layer 2 and the p-type semiconductor layer 3 is about 5 to 45 μm. It is preferably 10 to 20 μm. After laminating the p-type semiconductor layer 3, etching is performed to form the n-type semiconductor layer 2 and the p-type semiconductor layer 3 into a square having a side of about 0.5 to 0.78 mm. Further, etching is performed to expose the n-type semiconductor layer 2 on the p-type semiconductor layer. In order to form the n-type electrode 4 on the n-type semiconductor layer 2, the p-type semiconductor layer 3 is etched to a length of about 0.3 to 0.75 mm and a width of about 0.1 to 0.3 mm. The n-type electrode 4 is formed on the upper surface of the exposed n-type semiconductor layer 2. Further, the p-type electrode 5 is formed on the upper surface of the p-type semiconductor layer 3. The n-type electrode 4 and the p-type electrode 5 are formed by vapor deposition using a metal containing Ni. The n-type electrode 4 has a length of about 0.3 to 0.75 mm and a width of about 0.1 to 0.3 mm. The p-type electrode 5 has a length of about 0.2 to 0.5 mm and a width of about 0.3 to 0. It is 75 mm. The n-type semiconductor layer 2, the p-type semiconductor layer 3, the n-type electrode 4, and the p-type electrode 5 on the sapphire substrate 1 are covered with a first insulating protective film 8a composed of AlN and polysilazane. The end portion of the first insulating protective film 8a is formed on the sapphire substrate 1. The film thickness of the insulating protective film 8a is preferably about 0.5 to 5 μm. It is preferable that the insulating protective film 8a is provided from one side of each of the rectangles in the longitudinal direction to the inside from 0.01 to 0.2 mm with respect to the sapphire substrate 1. The first insulating protective film 8a covering the upper surfaces of the n-type electrode 4 and the p-type electrode 5 is removed by etching to expose the upper surfaces of both electrodes. The partial wave to be removed by the etching, the upper surface of the n-type electrode 4 and the p-type electrode 5 is preferable, and the upper surface of the n-type electrode 4 is etched by about 0.28 to 0.74 mm in length and about 0.05 to 0.25 mm in width, and the p-type electrode 5 is formed. The upper surface of the is about 0.28 to 0.74 mm in length and about 0.1 to 0 in width. Perform 45 mm etching. A first conductor 6a is formed on the upper surface of the exposed n-type electrode 4 by sputtering vapor deposition. As the first conductor 6a, a metal containing Ni is used. The first conductor 6a extends in the outer peripheral direction from the first insulating protective film 8a. Further, a first conductor 7a is formed on the upper surface of the exposed p-type electrode 5 by sputter vapor deposition. The first conductor 7a also uses a metal containing Ni. The first conductor 7a extends in the outer peripheral direction from the first insulating protective film 8a. A wall is formed so as to form a tapered shape on the upper part of the first conductor 6a. The tapered shape is formed so that the connecting area between the first conductor 6a and the second conductor 6b is narrower than the area of the upper surface of the connecting portion 6c. Then, Ni-containing plating is performed by electroless plating means to form a second conductor 6b. The first conductor 6a and the second conductor 6b are preferable in terms of adhesion, conductivity, etc. by using the same type of material. The second conductor 6b forms a tapered shape due to the wall. Similarly, a wall is formed so as to form a tapered shape on the upper part of the first conductor 7a. The tapered shape is formed so that the connecting area between the first conductor 7a and the second conductor 7b is narrower than the area of the upper surface of the connecting portion 7c. Then, Ni-containing plating is performed by electroless plating means to form a second conductor 7b. The second conductor 7b forms a tapered shape due to the wall. The second conductors 6b and 7b may be higher than the first conductors 6a and 7a. In the first embodiment, the height from the upper surface of the sapphire substrate 1 to the upper surfaces of the second conductors 6b and 7b is formed to be 7 to 80 μm. After forming the second conductors 6b and 7b, cover the first conductor 6a, the second conductor 6b, the first conductor 7a, the second conductor 7b and the first insulating protective film 8a. A second insulating protective film 8b is provided on the surface. The second insulating protective film 8b may be formed so as to cover the first conductor 7a. Film thickness 0 on the upper surface of the first conductor 6a. It is preferable that an insulating protective film 8a having a thickness of 1 μm or more is formed. In the first embodiment, the sapphire substrate 1 is covered with a second insulating protective film 8b from the top to a height of 7 to 100 μm. After the second insulating protective film 8b is provided, the connecting portion 6c and the connecting portion 7c are exposed so that the exposed surface and the upper surface of the second insulating protective film 8b are substantially flush with each other. To cut. The height from the upper surface of the sapphire substrate 1 to the upper surface of the second insulating protective film 8b is adjusted to 7 to 80 μm by cutting. After cutting, the wafer is cut out and made into chips. In the flip-chip type semiconductor light emitting device 200 formed in this manner, the negative electrode 13 and the second conductor 6b and the positive electrode 14 and the second conductor 7b are aligned by reversing the front and back sides. And mount it on the mounting board 15. Conductive adhesives 12 and 13 are used for the electrical connection between the negative electrode 13 and the second conductor 6b, and the positive electrode 14 and the second conductor 7b. The fluorescent substance 16 is provided on the upper surface of the sapphire substrate 1 with the front and back reversed, that is, the surface on which the semiconductor layer is not formed. As the fluorescent substance 16, a YAG-based fluorescent substance activated by Ce is used. From the above, the flip-chip type semiconductor light emitting element 200 and the light emitting device can be manufactured. In the flip-chip type semiconductor light emitting device 200, no conductor is formed on the upper portion 9 of the n-type electrode (first electrode) 4 and the upper portion 10 of the p-type electrode (second electrode) 5. , The configuration is clearly different from that of Comparative Examples 1 to 3. The difference from Comparative Examples 1 to 3 is that the conductor can be formed at a position facing the electrode of the mounting substrate 15 regardless of the position of the electrode. As a result, the pattern of the mounting board 15 can be changed to various ones. Further, even when the electrode-to-electrode D1 is narrow, since the conductor-to-conductor d2 is wide, the conductive adhesives 11 and 12 do not come into contact with each other, and a short circuit can be prevented extremely effectively. Cut so that the top surface is almost the same plane. The height from the upper surface of the sapphire substrate 1 to the upper surface of the second insulating protective film 8b is adjusted to 7 to 80 μm by cutting. After cutting, the wafer is cut out and made into chips. In the flip-chip type semiconductor light emitting device 200 formed in this manner, the negative electrode 13 and the second conductor 6b and the positive electrode 14 and the second conductor 7b are aligned by reversing the front and back sides. And mount it on the mounting board 15. Conductive adhesives 12 and 13 are used for the electrical connection between the negative electrode 13 and the second conductor 6b, and the positive electrode 14 and the second conductor 7b. The fluorescent substance 16 is provided on the upper surface of the sapphire substrate 1 with the front and back reversed, that is, the surface on which the semiconductor layer is not formed. As the fluorescent substance 16, a YAG-based fluorescent substance activated by Ce is used. From the above, the flip-chip type semiconductor light emitting element 200 and the light emitting device can be manufactured. In the flip-chip type semiconductor light emitting device 200, no conductor is formed on the upper portion 9 of the n-type electrode (first electrode) 4 and the upper portion 10 of the p-type electrode (second electrode) 5. , The configuration is clearly different from that of Comparative Examples 1 to 3. The difference from Comparative Examples 1 to 3 is that the conductor can be formed at a position facing the electrode of the mounting substrate 15 regardless of the position of the electrode. As a result, the pattern of the mounting board 15 can be changed to various ones. Further, even when the electrode-to-electrode D1 is narrow, since the conductor-to-conductor d2 is wide, the conductive adhesives 11 and 12 do not come into contact with each other, and a short circuit can be prevented extremely effectively. Cut so that the top surface is almost the same plane. The height from the upper surface of the sapphire substrate 1 to the upper surface of the second insulating protective film 8b is adjusted to 7 to 80 μm by cutting. After cutting, the wafer is cut out and made into chips. In the flip-chip type semiconductor light emitting device 200 formed in this manner, the negative electrode 13 and the second conductor 6b and the positive electrode 14 and the second conductor 7b are aligned by reversing the front and back sides. And mount it on the mounting board 15. Conductive adhesives 12 and 13 are used for the electrical connection between the negative electrode 13 and the second conductor 6b, and the positive electrode 14 and the second conductor 7b. The fluorescent substance 16 is provided on the upper surface of the sapphire substrate 1 with the front and back reversed, that is, the surface on which the semiconductor layer is not formed. As the fluorescent substance 16, a YAG-based fluorescent substance activated by Ce is used. From the above, the flip-chip type semiconductor light emitting element 200 and the light emitting device can be manufactured. In the flip-chip type semiconductor light emitting device 200, no conductor is formed on the upper portion 9 of the n-type electrode (first electrode) 4 and the upper portion 10 of the p-type electrode (second electrode) 5. , The configuration is clearly different from that of Comparative Examples 1 to 3. The difference from Comparative Examples 1 to 3 is that the conductor can be formed at a position facing the electrode of the mounting substrate 15 regardless of the position of the electrode. As a result, the pattern of the mounting board 15 can be changed to various ones. Further, even when the electrode-to-electrode D1 is narrow, since the conductor-to-conductor d2 is wide, the conductive adhesives 11 and 12 do not come into contact with each other, and a short circuit can be prevented extremely effectively. Adhesives 12 and 13 are used. The fluorescent substance 16 is provided on the upper surface of the sapphire substrate 1 with the front and back reversed, that is, the surface on which the semiconductor layer is not formed. As the fluorescent substance 16, a YAG-based fluorescent substance activated by Ce is used. From the above, the flip-chip type semiconductor light emitting element 200 and the light emitting device can be manufactured. In the flip-chip type semiconductor light emitting device 200, no conductor is formed on the upper portion 9 of the n-type electrode (first electrode) 4 and the upper portion 10 of the p-type electrode (second electrode) 5. , The configuration is clearly different from that of Comparative Examples 1 to 3. The difference from Comparative Examples 1 to 3 is that the conductor can be formed at a position facing the electrode of the mounting substrate 15 regardless of the position of the electrode. As a result, the pattern of the mounting board 15 can be changed to various ones. Further, even when the electrode-to-electrode D1 is narrow, since the conductor-to-conductor d2 is wide, the conductive adhesives 11 and 12 do not come into contact with each other, and a short circuit can be prevented extremely effectively. Adhesives 12 and 13 are used. The fluorescent substance 16 is provided on the upper surface of the sapphire substrate 1 with the front and back reversed, that is, the surface on which the semiconductor layer is not formed. As the fluorescent substance 16, a YAG-based fluorescent substance activated by Ce is used. From the above, the flip-chip type semiconductor light emitting element 200 and the light emitting device can be manufactured. In the flip-chip type semiconductor light emitting device 200, no conductor is formed on the upper portion 9 of the n-type electrode (first electrode) 4 and the upper portion 10 of the p-type electrode (second electrode) 5. , The configuration is clearly different from that of Comparative Examples 1 to 3. The difference from Comparative Examples 1 to 3 is that the conductor can be formed at a position facing the electrode of the mounting substrate 15 regardless of the position of the electrode. As a result, the pattern of the mounting board 15 can be changed to various ones. Further, even when the electrode-to-electrode D1 is narrow, since the conductor-to-conductor d2 is wide, the conductive adhesives 11 and 12 do not come into contact with each other, and a short circuit can be prevented extremely effectively.
【0059】
[Example 2]
FIG. 3 shows a cross-sectional view of the flip-chip type semiconductor element of the second embodiment. For almost the same parts as in the first embodiment, those having the same reference numerals are used, and the description thereof will be omitted.
【0060】
The n-type semiconductor layer 2 and the p-type semiconductor layer 3 are laminated on the spinel material substrate 1. The ends of the n-type semiconductor layer 2 and the p-type semiconductor layer 3 are etched, and the p-type semiconductor layer 3 is further etched so that a part of the n-type semiconductor layer 2 is exposed. The n-type electrode 4 is formed on the n-type semiconductor layer 2, and the p-type electrode 5 is formed on the p-type semiconductor layer 3. The above manufacturing method is almost the same as that of Example 1.
【0061】
The first insulating protective film 8a is formed so as to cover at least the outer side surface of the n-type electrode 4 and the side surface of the n-type semiconductor layer 2 on the n-type electrode 4 side from a part of the upper surface of the n-type electrode 4. The first insulating protective film 8a is stretched in the outward direction, and is stretched to the upper surface of the spinel substrate 1 in order to improve the adhesion between the first insulating protective film 8a and the semiconductor layer. The film thickness of the insulating protective film 8a shall be 2 to 5 μm. The first insulating protective film 8a uses a resin containing AlN and polysilazane.
【0062】
The first conductor 6a is pressure-bonded and formed on the upper surface of the n-type electrode 4, and is stretched outward with a thickness of 2 to 5 μm on the upper surface of the first conductor 6a. The first conductor 6a uses a metal containing Pt.
【0063】
A tapered second conductor 6b is formed on the upper surface of the first conductor 6a provided outside the n-type electrode 4 by using electroless plating means. The second conductor 6b also uses a metal containing Pt. It is preferable that the height of the upper surface of the second conductor 6b from the spinel substrate 1 and the height of the upper surface of the p-type electrode 5 from the spinel substrate 1 are approximately the same height of 80 to 130 μm. ..
【0064】
The second insulating protective film 8b includes a spinel substrate 1, an n-type semiconductor layer 2, a p-type semiconductor layer 3, an n-type electrode 4, and a second, except for the upper surface of the second conductor 6b and the upper surface of the p-type electrode 5. It is formed so as to cover the insulating protective film 8a of 1. The upper surface of the second insulating protective film 8b is formed so as to be substantially flush with the upper surface of the p-type electrode 5 and the upper surface of the second conductor 6b.
【0065】
The flip-chip type semiconductor light emitting device 210 was manufactured by the above manufacturing process. Similar to the first embodiment, the flip-chip type semiconductor light emitting device 210 is obtained by applying the YAG-based fluorescent substance 16 to the surface of the spinel substrate 1 (the surface on which the semiconductor layers are not laminated) with the front and back sides reversed. Align with the electrode 13 and the second electrode 14 of the above, and mount on the mounting substrate 15. This makes it possible to manufacture a light emitting element.
【0066】
[Example 3]
FIG. 4 shows a cross-sectional view of the flip-chip type semiconductor element of the third embodiment. For almost the same parts as in the first embodiment, those having the same reference numerals are used, and the description thereof will be omitted.
【0067】
The n-type semiconductor layer 2 and the p-type semiconductor layer 3 are laminated on the sapphire substrate 1. The ends of the n-type semiconductor layer 2 and the p-type semiconductor layer 3 are etched, and the p-type semiconductor layer 3 is further etched so that a part of the n-type semiconductor layer 2 is exposed. The n-type electrode 4 is formed on the n-type semiconductor layer 2, and the p-type electrode 5 is formed on the p-type semiconductor layer 3. The n-type semiconductor layer 2, the p-type semiconductor layer 3, the n-type electrode 4, and the p-type electrode 5 on the sapphire substrate 1 are covered with the first insulating protective film 8a. The first insulating protective film 8a is formed by sputter vapor deposition and is TiO.<sub>2</sub>At least contains. The first insulating protective film 8a covering the upper surfaces of the n-type electrode 4 and the p-type electrode 5 is removed by etching to expose the upper surfaces of both electrodes. The above manufacturing method is almost the same as that of Example 1.
【0068】
After the above manufacturing process, the conductor 6 is pressure-bonded to the n-type electrode 4, and the conductor 7 is pressure-bonded to the p-type electrode 5. A part of the conductor 6 is connected to the n-type electrode 4, and the other part of the conductor 6 is connected to the electrode 13 of the mounting substrate 15 at a position different from the upper portion 9 of the n-type electrode. The upper surface of the conductor 6 is formed on the surface. From the upper surface of the n-type electrode 4, a chair-shaped side wall is provided so as to be outward and upward from the outer direction. When the size of the n-type electrode 4 is 0.6 to 0.7 μm in length and 0.2 to 0.3 μm in width, the portion of the conductor 6 connected to the n-type electrode 4 is slightly smaller than that of the n-type electrode 4 and is 0.55 to 0.65 in length and 0.18 in width. Make the size ~ 0.28 and connect using electroless Ni plating. Similarly, the conductor 7 is integral so that part of the conductor 7 is connected to the p-type electrode 5 and the other part of the conductor 7 is connected to the electrode 14 of the mounting substrate 15. In addition, the upper surface of the conductor 7 is formed at a position different from the upper portion 10 of the p-type electrode. From the upper surface of the p-type electrode 5, a chair-shaped side wall is provided so as to be outward and upward from the outer direction. When the size of the p-type electrode 5 is 0.6 to 0.7 μm in length and 0.2 to 0.3 μm in width, the portion of the conductor 7 connected to the p-type electrode 5 is slightly smaller than the p-type electrode 5 and is 0.55 to 0.65 in length and 0.18 in width. Make the size ~ 0.28 and connect using electroless Ni plating.
【0069】
The upper surfaces of the conductor 6, the conductor 7, and the first insulating protective film 8a are formed so as to be covered with a second insulating protective film 8b containing AlN and polysilazane. After that, the second insulating protective film 8b is polished to expose the upper surfaces of the conductor 6 and the conductor 7. Further, the upper surface of the second insulating protective film 8b, the upper surface of the conductor 6 and the upper surface of the conductor 7 are exposed so as to be substantially flush with each other. The height of the upper surface of the second insulating protective film 8b from the upper surface of the sapphire substrate 1 is about 100 to 150 μm.
【0070】
The flip-chip type semiconductor light emitting device 220 was manufactured by the above manufacturing process. The flip-chip type semiconductor light emitting device 210 is also mounted on the mounting substrate 15 with the front and back sides reversed, as in the first and second embodiments. This makes it possible to manufacture a light emitting element.
【0071】
[Example 4]
FIG. 5 shows a cross-sectional view of the flip-chip type semiconductor element of the fourth embodiment. For almost the same parts as in the first embodiment, those having the same reference numerals are used, and the description thereof will be omitted.
【0072】
The p-type semiconductor layer 3 is laminated on the n-type semiconductor layer 2. The end of the p-type semiconductor layer 3 and a part of the upper end of the n-type semiconductor layer 2 are removed by etching, and the p-type semiconductor layer 3 is etched so that the n-type semiconductor layer 2 is exposed. The n-type electrode 4 is formed on the n-type semiconductor layer 2. n-type semiconductor layer 2, p-type semiconductor layer 3, n-type electrode 4, p-type electrode 5<sub>2</sub>And covered with a first insulating protective film 8a containing polysilazane. The first insulating protective film 8a covering the upper surfaces of the n-type electrode 4 and the p-type electrode 5 is removed by etching to expose the upper surfaces of both electrodes. The first insulating protective film 8a covering the outer portion of the n-type electrode 4 is formed so as to be substantially the same height as the upper surface of the n-type electrode 4. The above manufacturing method is almost the same as that of Example 1.
【0073】
After the above manufacturing process, the conductor 6 is pressure-bonded to the n-type electrode 4, and the conductor 7 is pressure-bonded to the p-type electrode 5. A part of the conductor 6 is connected to the n-type electrode 4, and the other part of the conductor 6 is connected to the electrode 13 of the mounting substrate 15 at a position different from the upper portion 9 of the n-type electrode. The upper surface of the conductor 6 is formed on the surface. The conductor 6 is provided on the upper surface of the first insulating protective film 8a, and extends outwardly substantially parallel to the light emitting surface of the n-type electrode. The connecting surface of the conductor 6 is provided so as to be a side surface of the flip-chip type semiconductor light emitting element 230. A part of the conductor 7 is connected to the p-type electrode 5, and the other part of the conductor 7 is connected to the electrode 14 of the mounting substrate 15. A conductor 7 is provided on the upper surface of the p-type electrode 5.
【0074】
The conductor 6, the conductor 7, and the first insulating protective film 8a are formed so as to be covered with the second insulating protective film 8b. Then, the second insulating protective film 8b is polished to expose the upper surface of the conductor 7. Further, the upper surface of the second insulating protective film 8b and the upper surface of the conductor 7 are exposed so as to be substantially flush with each other. The height of the upper surface of the second insulating protective film 8b from the light emitting surface of the n-type electrode 4 is about 30 to 100 μm.
【0075】
A wafer of n-type semiconductor 2 is cut out and made into a chip. After chipping, it is preferable to polish the side surface of the flip-chip type semiconductor light emitting device 230 so as to expose the connecting surface of the conductor 6.
【0076】
The flip-chip type semiconductor light emitting device 230 was manufactured by the above manufacturing process. The flip-chip type semiconductor light emitting device 230 is also mounted on the mounting substrate 15 with the front and back sides reversed, as in the first to third embodiments. This makes it possible to manufacture a light emitting element.
【0077】
[Effect of the invention]
From the above, the present invention provides a light emitting device capable of extremely effectively preventing a short circuit between electrodes and a method for manufacturing the same. Further, the present invention provides a light emitting element in which the height of the light emitting element can be adjusted extremely easily. Further, the present invention provides a light emitting element that can appropriately cope with a change in the mounting substrate. Further, when the light emitting element is mounted on the mounting substrate, the grounding stability is improved and the light emitting performance is improved. As described above, the present invention has extremely important technical significance.
[Simple explanation of drawings]
[Figure 1]
(a) shows the AA cross-sectional view of the flip chip type semiconductor element which concerns on this invention. (b) shows a schematic view of the flip-chip type semiconductor light emitting device according to the present invention as viewed from above.
[Figure 2]
The manufacturing method of the flip chip type semiconductor element which concerns on this invention is shown.
[Fig. 3]
The cross-sectional view of the flip chip type semiconductor element of Example 2 is shown.
[Fig. 4]
The cross-sectional view of the flip chip type semiconductor element of Example 3 is shown.
[Fig. 5]
The cross-sectional view of the flip chip type semiconductor element of Example 4 is shown.
[Fig. 6]
A cross-sectional view of a conventional semiconductor light emitting device is shown.
[Fig. 7]
The cross-sectional view of the semiconductor light emitting device described in Reference 1 is shown.
[Fig. 8]
The cross-sectional view of the semiconductor light emitting device described in the application specification of Reference 2 is shown.
[Explanation of symbols]
1 board 2 First semiconductor (n-type semiconductor layer) 3 Second semiconductor (p-type semiconductor layer) 4 First electrode (n-type electrode) 5 Second electrode (p-type electrode) 6 Conductor 6a 1st conductor 6b 2nd conductor 7 Conductor 7a 1st conductor 7b 2nd conductor 8 Insulation protective film 8a 1st insulation protective film 8b 2nd insulation protective film 9 Upper part of the first insulating protective film 10 Upper part of the second insulating protective film 11, 12 Conductive adhesive 13 Negative electrode 14 Positive electrode 15 Mounting board 16 Fluorescent material 101 board 102 First semiconductor (n-type semiconductor layer) 103 Second semiconductor (p-type semiconductor layer) 104 First electrode (n-type electrode) 105 Second electrode (p-type electrode) 106 Conductor 106a First conductor 106b Second conductor 107 Conductor 107a First conductor 107b Second conductor 108 Insulation protective film 108a First insulation protective film 108b Second insulation protective film 109 Upper part of the first insulating protective film 110 Top of second insulation protective film 111, 112 Conductive adhesive 113 Negative electrode 114 positive electrodes 115 Mounting board 200, 210, 220, 230 Flip-chip type semiconductor light emitting element (semiconductor element) 300, 310, 320 semiconductor light emitting device Distance between D1 and D3 electrodes Distance between D2, D4, D5 conductors Height from the substrate of the H1 and H2 flip-chip semiconductor elements to the mounting substrate Height from the substrate of the H3 and H4 semiconductor light emitting elements to the mounting substrate
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2 members in 1 office
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| 2002078303 | Japan | A | |
| JP20020078303 | – | – | – |
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| JP2003282957AThis record | Japan | A | |
| JP4214704B2 | Japan | B2 |
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Numbers
- Publication
- 2003-282957
- Publication, DOCDB
- 2003282957
- Publication, EPODOC
- JP2003282957
- Application
- 78303
- Application, DOCDB
- 2002078303
- Application, EPODOC
- JP20020078303
Titles2
- Japanese
- 【発明の名称】フリップチップ型半導体素子及びその製造方法
- English
- INDUSTRIAL APPLICABILITY: Flip-chip type semiconductor element and its manufacturing method
Classification
- IPC, 4
- H01L21 28
- H01L33 30
- H01L33 50
- H01L33 62