WO2005008793A1 - 発光素子及び発光素子の製造方法 - Google Patents
発光素子及び発光素子の製造方法 Download PDFInfo
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- WO2005008793A1 WO2005008793A1 PCT/JP2004/009722 JP2004009722W WO2005008793A1 WO 2005008793 A1 WO2005008793 A1 WO 2005008793A1 JP 2004009722 W JP2004009722 W JP 2004009722W WO 2005008793 A1 WO2005008793 A1 WO 2005008793A1
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 303
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/36—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the electrodes
- H01L33/40—Materials therefor
- H01L33/405—Reflective materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/005—Processes
- H01L33/0093—Wafer bonding; Removal of the growth substrate
Definitions
- Light emitting device and method for manufacturing light emitting device are Light emitting device and method for manufacturing light emitting device
- the present invention relates to a light emitting device and a method for manufacturing the same.
- a light-emitting device in which a light-emitting layer is formed by AlGalnP mixed crystal has a thin AlGalnP (or GalnP) active layer, a bandgap larger than that, and an n-type AlGalnP cladding layer and a p-type AlGalnP cladding layer.
- Such an AlGalnP double hetero structure can be formed by epitaxially growing each layer of the AlGalnP mixed crystal on a GaAs single crystal substrate, utilizing the fact that the AlGalnP mixed crystal lattice-matches with GaAs.
- a GaAs single crystal substrate is often used as it is as an element substrate.
- the AlGalnP mixed crystal constituting the light emitting layer has a larger band gap than GaAs, the emitted light is absorbed by the Ga As substrate and it is difficult to obtain sufficient light extraction efficiency.
- Japanese Patent Application Laid-Open No. 2001-339100 discloses that while a GaAs substrate for growth is peeled off, an element substrate for reinforcement (having conductivity) is formed on the peeled surface via an Au layer for reflection. A bonding technique is disclosed.
- This Au layer has the advantage that the reflectivity is high and the dependence of the reflectivity on the incident angle is small.
- the peak wavelength at which absorption of light in a specific wavelength band is large is the peak wavelength. In the case of a light emitting element set in a long range, there is a problem that the reflectance is reduced by absorption.
- Nikkei Electronics, October 21, 2002 pages 124-132 states that the reflection layer is made of A1, whose wavelength dependence of the reflectance is smaller than that of Au, to increase the reflection intensity.
- An element is disclosed.
- an A1 reflective layer is arranged between the light emitting layer portion and an element substrate composed of a silicon substrate.
- An Au layer is interposed between the substrate and the substrate to facilitate the bonding between the silicon substrate and the light emitting layer.
- an Au layer is formed so as to cover the A1 reflective layer formed on the light-emitting layer side, while an Au layer is also formed on the silicon substrate side, and these Au layers are adhered to each other for bonding. I am doing it.
- An object of the present invention is to provide a light emitting element having a structure in which a light emitting layer portion is covered with a reflective metal layer, and the reflective metal layer is bonded to an element substrate via another bonding metal layer. It is an object of the present invention to provide a light emitting element which can effectively prevent the diffusion of components from the combined metal layer to the reflective metal layer, and which is less likely to cause a defect such as a decrease in reflectance due to the diffusion, and a method of manufacturing the same.
- Patent Document 1 Japanese Patent Application Laid-Open No. 7-66455
- Patent Document 2 Japanese Patent Application Laid-Open No. 2001-339100
- Non-Patent Document 1 Nikkei Electronics Oct. 21, 2002, p. 124 p. 132
- the first main surface of the compound semiconductor layer having the light emitting layer portion is a light extraction surface, and a reflection surface for reflecting light from the light emitting layer portion to the light extraction surface side is provided on the second main surface side of the compound semiconductor layer.
- a reflective metal layer having a metal layer is formed, the reflective metal layer is bonded to the element substrate via the bonding metal layer, and the reflective metal layer and the bonding metal layer are interposed between the reflective metal layer and the bonding metal layer.
- the component diffusion from the bonding metal layer to the reflecting metal layer is performed by interposing the reflection metal layer-side diffusion blocking layer between the reflecting metal layer and the bonding metal layer.
- the method for manufacturing a light emitting device of the present invention includes:
- the first main surface of the compound semiconductor layer having the light emitting layer portion is a light extraction surface, and a reflection surface for reflecting light from the light emitting layer portion to the light extraction surface side is provided on the second main surface side of the compound semiconductor layer.
- a method for manufacturing a light-emitting element comprising: forming a reflective metal layer having a structure; and bonding the reflective metal layer to an element substrate via a bonding metal layer.
- the bonding is performed with the reflective metal layer-side diffusion blocking layer interposed between the reflective metal layer and the bonding metal layer. It is possible to effectively suppress the diffusion of components from the bonding metal layer to the reflective metal layer after the alignment, and thereby effectively suppress the decrease in the reflectivity of the reflective metal layer due to the diffusion of the components, thereby easily realizing a high-luminance light emitting device. it can. In particular, when performing a heat treatment in which diffusion is likely to proceed during bonding, the effect of the present invention becomes more remarkable.
- the bonding metal layer is interposed between the reflective metal layer and the element substrate to assist the bonding when it is relatively difficult to bond the reflective metal layer to the element substrate by itself.
- the reflectance of the light from the light emitting layer portion itself is often inferior to that of the reflective metal layer.
- a metal having a lower reflectance than the reflective metal layer is used for the light from the light emitting layer, the reflectance decreases when the metal component from the coupling metal layer is diffused into the reflective metal layer. It can be said that the problem described above easily occurs. Therefore, as in the present invention, a reflective metal layer-side diffusion blocking layer is provided between the bonding metal layer and the reflective metal layer. If interposed, the effect of suppressing a decrease in reflectance due to the diffusion is particularly remarkable.
- the bonding metal layer is composed of an Au-based metal containing Au as a main component (in the present specification, the "main component” means the highest mass content. Component).
- Au is suitable as a material for the metal layer for bonding because Au is chemically stable and hardly forms a thick and strong passive film such as A1.
- a metal reflection layer, a reflection metal layer-side diffusion blocking layer, and a first Au-based metal layer are formed in this order from the main surface side, while the element substrate is formed.
- the affinity between the Au-based metal layers will increase. Since it is strong, there is an advantage that a sufficient bonding strength can be easily obtained even at a relatively low temperature.
- FIG. 4 shows the reflectance on various polished metal surfaces.
- the plot point “ ⁇ ” is the reflectance of Au.
- Au has strong absorption in the visible light region with a wavelength of 670 nm or less (especially 650 nm or less; the absorption is even greater at 600 nm or less).
- the peak emission wavelength of is less than 670 nm, the reflectance is significantly reduced.
- the emission intensity is easily reduced, and the spectrum of the extracted light is different from the original emission spectrum due to absorption, and the emission color tone is liable to change.
- the diffusion blocking layer on the reflective metal layer side is interposed as in the present invention, the above-mentioned problems can be effectively suppressed.
- the reflective metal layer can be composed of an A1-based metal whose main component is A1.
- A1-based metal whose main component is A1.
- the reflectance is better than that of Au, which also contributes to the improvement of light extraction efficiency.
- the portion of the reflective metal layer that forms the reflective surface can be an Ag-based reflective layer containing Ag as a main component.
- the Ag-based reflective metal layer exhibits better reflectivity than the Au-based metal over almost the entire visible light wavelength range (350 nm or more and 700 nm), and has a small wavelength dependence of the reflectivity. As a result, high light extraction efficiency can be realized regardless of the emission wavelength of the element. Also, as compared with the Au-based reflective metal layer, even for blue to green light emission, the reflectance is less likely to decrease due to the formation of the oxide film and the like.
- the plot point “Kuni” in Fig. 4 shows the wavelength dependence of the reflectivity of Ag.
- the plot point “X” is an AgPdCu alloy.
- the reflectivity of visible light is particularly good when the reflectivity of Ag is 350 nm or more and 700 nm or less (and in the infrared region longer than that), particularly 380 nm or more and 700 nm or less. Naturally, good reflectance can be obtained even in the blue to green emission wavelength region having a peak wavelength of 400 nm or more and 550 nm or less.
- the above-mentioned A1-based reflective metal layer is inexpensive compared to the Ag-based reflective metal layer, the reflectance in the visible light range is slightly lower due to the decrease in reflectance due to the formation of an oxide film ( For example, 85-92%).
- the A beam can secure a high reflectance in the visible light region. If the diffusion blocking layer on the reflection metal layer side is interposed as in the present invention, the diffusion of the Au component from the Au-based bonding metal layer to the Ag-based reflection metal layer can be effectively suppressed.
- the reflection blocking layer on the reflection metal layer side can be specifically a metal layer mainly containing any one of Ti, Ni and Cr.
- Metals containing Ti, Ni or Cr as the main components are suitable for use in the present invention because they have an excellent effect of suppressing the diffusion of Au components into the reflective metal layer, which has a small diffusion coefficient for Au.
- the thickness of the diffusion blocking layer on the reflection metal layer side is desirably not less than lnm and not more than 10 zm. If the thickness is less than lnm, the diffusion prevention effect will not be sufficient, and if it exceeds 10 xm, the effect will be saturated and the production cost will rise unnecessarily.
- the reflective metal layer-side diffusion blocking layer may specifically be made of pure Ti, pure Ni or pure Cr for industrial use, but the diffusion preventing effect on Au is impaired. Subcomponents can be contained within a range that cannot be controlled. For example, an appropriate amount of Pd-added calo has an effect of improving the corrosion resistance of a metal mainly composed of Ti, Ni or Cr. Also, an alloy of Ti, Ni, and Cr can be used.
- the light emitting device of the present invention is formed of a conductive material between the element substrate and the bonding metal layer, and diffuses a component derived from the element substrate into the bonding metal layer.
- a substrate-side diffusion blocking layer for blocking can be provided. According to this structure, component diffusion from the element substrate to the bonding metal layer is blocked by the substrate-side diffusion blocking layer, so that the quality of the bonding metal layer due to the diffusion can be effectively suppressed. As a result, problems such as a decrease in the adhesion strength between the bonding metal layer and the device substrate and a decrease in the reflectance due to the diffusion of the component of the device substrate to the reflective metal layer are effectively suppressed. A decrease in the product yield of the element is unlikely to occur.
- the bonding metal layer is made of an Au-based metal layer containing Au as a main component and the element substrate is a Si substrate.
- the Si substrate can easily secure sufficient conductivity as a light emitting element by doping, and is inexpensive.
- eutectic reaction easily occurs at relatively low temperatures between Si and Au (the eutectic temperature of the Au-Si binary system is 363 ° C, but the eutectic temperature further decreases when other alloy components are interposed.
- the bonding is performed by heat treatment, the diffusion of Si on the substrate side to the Au-based metal layer side tends to proceed.
- the Au-based layer in the metal layer tends to cause a decrease in reflectance due to the Si diffusion.
- a substrate-side diffusion blocking layer is provided between the Au-based metal layer and the Si substrate, the diffusion of Si into the Au-based metal layer can be effectively suppressed.
- the substrate-side diffusion blocking layer can be specifically a metal layer mainly containing any one of Ti, Ni and Cr. Metals containing Ti, Ni or Cr as the main components are particularly excellent in the effect of suppressing the diffusion of Si into the Au-based metal layer, and therefore can be suitably used in the present invention. Further, the thickness of the substrate-side diffusion blocking layer is desirably not less than lnm and not more than 10 ⁇ m. If the thickness is less than 1 nm, the diffusion preventing effect is not sufficient, and if it exceeds 10 zm, the effect is saturated, leading to a wasteful rise in manufacturing cost.
- the substrate-side diffusion blocking layer may specifically be made of pure Ti, pure Ni, or pure industrial grade. As long as the effect of preventing the diffusion of Si into the Au-based metal layer is not impaired, it is possible to contain secondary components such as Pd, and alloys of Ti with Ni and Cr can also be used. . Brief Description of Drawings
- FIG. 1 is a schematic view showing a first embodiment of a light emitting device of the present invention in a laminated structure.
- FIG. 2 is an explanatory view showing one example of a manufacturing process of the light emitting device of FIG. 1.
- FIG. 3 is a schematic view showing a second embodiment of the light emitting device of the present invention in a laminated structure.
- FIG. 4 is a diagram showing reflectance of various metals.
- Substrate side diffusion blocking layer Ti-based metal layer
- FIG. 1 is a conceptual diagram showing a light emitting device 100 according to one embodiment of the present invention.
- the light emitting element 100 has a structure in which a light emitting layer portion 24 is bonded via a metal layer 10 on a first main surface of an Si substrate 7 made of n-type Si (silicon) single crystal, which is a conductive substrate forming an element substrate. I have it.
- the light emitting layer section 24 is made of non-doped (Al Ga) In P (where 0 ⁇ x ⁇ 0.55, 0.45 ⁇ y ⁇ x1—xy1—y
- the active layer 5 composed of a mixed crystal is formed as a first conductivity type clad layer, in this embodiment, a p-type (Al Ga z
- the emission wavelength is from green to red (the emission wavelength (peak emission wavelength) is 550 nm or more and 670 nm or less) ) Can be adjusted.
- the p-type AlGalnP cladding layer 6 is disposed on the metal electrode 9 side, and the n-type AlGalnP cladding layer 4 is disposed on the coupling metal layer 10k side. Therefore, the polarity of the conduction is positive on the metal electrode 9 side.
- non-doped means “do not actively add a dopant”, and includes a dopant component unavoidably mixed in a normal manufacturing process (for example, 10 13 10 16 / cm 3 ) is not excluded.
- a current diffusion layer 20 made of AlGaAs is formed on the main surface of the light emitting layer portion 24 opposite to the surface facing the substrate 7, and the light emitting layer portion is formed substantially at the center of the main surface.
- a metal electrode (for example, an Au electrode) 9 for applying a light emission driving voltage to 24 is formed so as to cover a part of the main surface.
- the area around the metal electrode 9 on the main surface of the current diffusion layer 20 forms a light extraction area from the light emitting layer section 24.
- a metal electrode (back surface electrode: for example, an Au electrode) 15 is formed so as to cover the entire surface.
- an AuSb contact metal layer 16 is interposed between the metal electrode 15 and the Si single crystal substrate 7 as a substrate-side contact metal layer.
- an AuSn contact metal layer may be used as the substrate-side contact metal layer.
- the reflective metal layer-side diffusion blocking layer 10f is a Ti-based metal layer (for example, a Ti layer), and has a thickness of lnm or more and 10 / im or less (200nm in the present embodiment).
- the reflective metal layer-side diffusion blocking layer 10f may be a Ni-based metal layer (for example, a Ni layer) or a Cr-based metal layer (for example, a Cr layer) instead of the Ti-based metal layer.
- an AuGeNi contact metal layer 32 (eg, Ge: 15% by mass, Ni: 10% by mass) is formed between the light emitting layer portion 24 and the reflective metal layer 10c as a light emitting layer portion side contact metal layer. This contributes to reducing the series resistance of the device.
- the AuGeNi contact metal layer 32 is dispersedly formed on the main surface of the light emitting layer section 24, and the formation area ratio is 1% or more and 25% or less.
- an AuSb contact metal layer 31 (for example, Sb: 5% by mass). Note that an AuSn contact metal layer may be used instead of the AuSb contact metal layer 31.
- the AuSb contact metal layer 31 is covered with a substrate-side diffusion blocking layer 10d made of a Ti-based metal layer (eg, a Ti layer).
- the thickness of the substrate-side diffusion blocking layer 10d is lnm or more and 10 / m or less (200 nm in this embodiment).
- the substrate-side diffusion blocking layer 10d may be a Ni-based metal layer (for example, a Ni layer) or a Cr-based metal layer (for example, a Cr layer) instead of the Ti-based metal layer.
- a coupling metal layer 10k Au-based metal layer
- the thickness of the reflective metal layer 10c is 80 nm or more in order to ensure a sufficient reflection effect. There is no particular upper limit on the thickness, but the reflection effect is saturated, so that the thickness is appropriately determined in consideration of cost (for example, about l m).
- the thickness of the coupling metal layer 10k is 200 nm or more and 10 x m or less.
- a p-type GaAs buffer layer 2 is formed on a main surface of a GaAs single crystal substrate 1 which is a semiconductor single crystal substrate forming a substrate for emitting a light emitting layer, for example, with a thickness of 0.5 ⁇ m.
- the release layer 3 made of AlAs is, for example, 0.5 zm
- the current diffusion layer 20 made of p-type AlGaAs is, for example, 5 ⁇ m
- MOVPE Metal Organic Vapor Phase Epitaxy
- a 1 / m p-type A IGalnP cladding layer 6 a 0.6 ⁇ m AlGalnP active layer (non-doped) 5, and a 1 ⁇ m ⁇ -type A IGalnP cladding layer 4 Epitaxial growth in this order.
- an AuGeNi contact metal layer 32 is dispersedly formed on the main surface of the light emitting layer section 24.
- an alloying heat treatment is performed in a temperature range of 350 ° C. or more and 500 ° C. or less.
- An alloying layer is formed between the light emitting layer section 24 and the AuGeNi contact metal layer 32 by the above alloying heat treatment, and the series resistance is greatly reduced.
- a reflective metal layer 10c made of an A1-based metal layer is formed (thickness of, for example, 300 nm) so as to cover the AuGeNi contact metal layer 32, and then a reflective metal layer-side diffusion blocking layer 10f made of a Ti-based metal layer (thickness: : For example, 200 nm).
- a first Au-based metal layer 10a (thickness: 2 ⁇ m, for example) serving as a bonding metal layer is formed so as to further cover the reflective metal layer 10c and the reflective metal layer-side diffusion blocking layer 10f.
- the A1-based reflective metal layer 10c is formed so as to cover an area other than the outer peripheral edge of the main surface of the light emitting layer portion 24, and the first Au-based metal layer 10a is located outside the outer peripheral edge of the reflective metal layer 10c.
- the peripheral side surface of the A1-based reflective metal layer 10c is covered with the first Au-based metal layer 10a.
- the AuSb contact metal layers 31 and 16 serving as the substrate-side contact metal layers 31 and 16 were formed on both main surfaces of the separately prepared Si single crystal substrate 7 (n-type). (Tact metal layer may be used) and perform alloying heat treatment in a temperature range of 100 ° C or more and 500 ° C or less. Then, on the AuSb contact metal layer 31, a substrate side diffusion blocking layer 10d (thickness: for example, 200 nm) composed of a Ti-based metal layer and a second Au-based metal layer 10b (thickness: for example, 2 ⁇ m) are arranged in this order. Formed at On the AuSb contact metal layer 16, a back electrode layer 15 (for example, one made of an Au-based metal layer) is formed. In the above steps, each metal layer can be formed by using sputtering, vacuum deposition, or the like.
- the second Au-based metal layer 10b on the side of the Si single crystal substrate 7 is overlapped with the first Au-based metal layer 10a formed on the light emitting layer section 24 and pressed.
- the bonded substrate is subjected to a bonding heat treatment at a temperature of 80 ° C. or more and 500 ° C. or less, for example, 200 ° C., to produce a bonded substrate 50.
- the Si single crystal substrate 7 is bonded to the light emitting layer section 24 via the first Au-based metal layer 10a and the second Au-based metal layer 10b.
- the first Au-based metal layer 10a and the second Au-based metal layer 10a b is integrated with the bonding heat treatment to form a bonding metal layer 10k. Since the first Au-based metal layer 10a and the second Au-based metal layer 10b are mainly composed of Au, which is hardly oxidized, the bonding heat treatment can be performed without any problem, for example, in the air. .
- a metal reflection layer-side diffusion blocking layer 10f made of a Ti-based metal layer is interposed between the first Au-based metal layer 10a and the metal reflection layer 10c made of an A1-based metal.
- the metal reflection layer 10c is an A1-based metal layer
- the metal reflection layer-side diffusion blocking layer 10f is omitted, the Au from the first Au-based metal layer 10a to the metal reflection layer 10c even at a low temperature of around 115 ° C. This leads to a problem that the reflectance of the metal reflective layer 10c is lowered (especially in the emission wavelength range from blue to green having a wavelength of 400 nm or more and 550 nm or less).
- the metal reflection layer side diffusion blocking layer 10f is provided as described above, diffusion of the Au component from the first Au-based metal layer 10a to the metal reflection layer 10c during the bonding heat treatment is effectively suppressed, and The reflectance of the reflection layer 10c can be kept good.
- up to 360 ° C even if the heat treatment temperature for bonding is increased, diffusion of Au into the metal reflective layer 10c made of A1 metal does not become remarkable, and thus the bonding temperature can be increased. Can improve bonding strength.
- a substrate-side diffusion blocking layer 10d serving as a Ti-based metal layer is interposed between the second Au-based metal layer 10b and the Si single crystal substrate 7 (AuSb contact metal layer 31).
- the bonding metal layer (the (Au-based metal layer / second Au-based metal layer) Exudation of the Si component to the side of the reflective metal layer 10c is effectively suppressed.
- the second Au-based metal layer 10b (bonding metal layer) by vapor deposition or the like
- Si diffuses through the AuSb contact metal layer 31 from the Si single crystal substrate 7, and The Si may well on the outermost surface of the second Au-based metal layer 10b.
- the bonding of the second Au-based metal layer (binding metal layer) 10b and the first Au-based metal layer (binding metal layer) 10a may be significantly inhibited. .
- the substrate-side diffusion blocking layer 10d is formed as described above, Oxidation is effectively suppressed, and the bonding strength between the Si single crystal substrate 7 and the light emitting layer (compound semiconductor layer) 24 by the bonding metal layer 10k can be further increased.
- the bonded substrate 50 is immersed in an etching solution composed of, for example, a 10% hydrofluoric acid aqueous solution to remove the AlAs formed between the buffer layer 2 and the current diffusion layer 20.
- an etching solution composed of, for example, a 10% hydrofluoric acid aqueous solution to remove the AlAs formed between the buffer layer 2 and the current diffusion layer 20.
- the GaAs single crystal substrate 1 which is opaque to light from the light emitting layer portion 24
- the Si single crystal substrate 7 bonded thereto. Peel from body 50a.
- an etch stop layer made of AllnP is formed instead of the AlAs peeling layer 3, and the GaAs is etched using a first etchant having a selective etching property to GaAs (for example, a mixed solution of ammonia and hydrogen peroxide).
- the single crystal substrate 1 is removed by etching together with the GaAs buffer layer 2, and then a second etching solution having a selective etching property against ⁇ (for example, hydrochloric acid: by adding hydrofluoric acid to remove the A1 oxide layer) ) To remove the etch stop layer by etching.
- a second etching solution having a selective etching property against ⁇ for example, hydrochloric acid: by adding hydrofluoric acid to remove the A1 oxide layer
- the reflective metal layer 10c made of an A1-based metal layer is surrounded by the first Au-based metal layer 10a, and the outer peripheral surface of the A1-based reflective metal layer 10c is formed of the first Au-based metal layer 10a having high corrosion resistance. Since the light emitting layer is protected by the outer peripheral portion 10e, even if the light emitting layer growth substrate (GaAs single crystal substrate 1) is etched in the step 5, the effect is reduced to the A1-based reflective metal layer 10c.
- GaAs single crystal substrate 1 is used as a substrate for growing a light emitting layer, and this is dissolved and removed using an ammonia / hydrogen peroxide mixed solution as an etchant, A1 is particularly susceptible to corrosion by the etchant. If GaAs is adopted, the GaAs single crystal substrate 1 can be dissolved and removed without any problem.
- step 6 the current diffusion layer exposed by removing the GaAs single crystal substrate 1
- a semiconductor chip is diced by an ordinary method, and the semiconductor chip is fixed to a support, wire-bonded to a lead wire, and then sealed with a resin, whereby a final light emitting element is obtained.
- the reflection metal layer 10c made of an Ag-based metal can be used instead of the reflection metal layer 10c made of an A1-based metal.
- AgGeNi for example, Ge: 15 mass%
- Ni 10 (% By mass) of the Ag-based contact metal layer 132 is dispersedly formed.
- the other parts are the same as those of the light emitting device 100 of FIG.
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Abstract
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003-200443 | 2003-07-23 | ||
JP2003200443A JP3951300B2 (ja) | 2003-07-23 | 2003-07-23 | 発光素子及び発光素子の製造方法 |
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WO2005008793A1 true WO2005008793A1 (ja) | 2005-01-27 |
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PCT/JP2004/009722 WO2005008793A1 (ja) | 2003-07-23 | 2004-07-08 | 発光素子及び発光素子の製造方法 |
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JP (1) | JP3951300B2 (ja) |
TW (1) | TW200511610A (ja) |
WO (1) | WO2005008793A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8283683B2 (en) | 2006-11-07 | 2012-10-09 | Opto Tech Corporation | Chip-bonding light emitting diode chip |
JP2015049852A (ja) * | 2013-09-04 | 2015-03-16 | 大日本印刷株式会社 | タッチパネルセンサおよびタッチ位置検出機能付き表示装置 |
Families Citing this family (8)
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KR20060131327A (ko) * | 2005-06-16 | 2006-12-20 | 엘지전자 주식회사 | 발광 다이오드의 제조 방법 |
JP2007103689A (ja) * | 2005-10-05 | 2007-04-19 | Matsushita Electric Ind Co Ltd | 半導体発光装置 |
TWI324403B (en) * | 2006-11-07 | 2010-05-01 | Opto Tech Corp | Light emitting diode and method manufacturing the same |
TWI370555B (en) * | 2006-12-29 | 2012-08-11 | Epistar Corp | Light-emitting diode and method for manufacturing the same |
JP5416363B2 (ja) * | 2008-05-01 | 2014-02-12 | 日立金属株式会社 | 半導体発光素子及びその製造方法 |
TWI395349B (zh) * | 2009-10-20 | 2013-05-01 | Just Innovation Corp | 發光二極體晶片及其製造方法 |
TWI405358B (zh) * | 2010-03-16 | 2013-08-11 | Just Innovation Corp | 發光二極體晶片及其製作方法 |
KR101710359B1 (ko) * | 2010-08-20 | 2017-02-27 | 엘지이노텍 주식회사 | 발광소자 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49107475A (ja) * | 1973-02-15 | 1974-10-12 | ||
JPS61220344A (ja) * | 1985-03-26 | 1986-09-30 | Nec Corp | 半導体装置の製造方法 |
JP2000294837A (ja) * | 1999-04-05 | 2000-10-20 | Stanley Electric Co Ltd | 窒化ガリウム系化合物半導体発光素子 |
JP2001339100A (ja) * | 2000-05-30 | 2001-12-07 | Shin Etsu Handotai Co Ltd | 発光素子及びその製造方法 |
JP2002026392A (ja) * | 2000-06-30 | 2002-01-25 | Toshiba Corp | 半導体発光素子とその製造方法、及び半導体発光装置 |
-
2003
- 2003-07-23 JP JP2003200443A patent/JP3951300B2/ja not_active Expired - Fee Related
-
2004
- 2004-06-15 TW TW093117110A patent/TW200511610A/zh not_active IP Right Cessation
- 2004-07-08 WO PCT/JP2004/009722 patent/WO2005008793A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49107475A (ja) * | 1973-02-15 | 1974-10-12 | ||
JPS61220344A (ja) * | 1985-03-26 | 1986-09-30 | Nec Corp | 半導体装置の製造方法 |
JP2000294837A (ja) * | 1999-04-05 | 2000-10-20 | Stanley Electric Co Ltd | 窒化ガリウム系化合物半導体発光素子 |
JP2001339100A (ja) * | 2000-05-30 | 2001-12-07 | Shin Etsu Handotai Co Ltd | 発光素子及びその製造方法 |
JP2002026392A (ja) * | 2000-06-30 | 2002-01-25 | Toshiba Corp | 半導体発光素子とその製造方法、及び半導体発光装置 |
Non-Patent Citations (1)
Title |
---|
NIKKEI ELECTRONICS, no. 833, 21 October 2002 (2002-10-21), pages 124 - 132 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8283683B2 (en) | 2006-11-07 | 2012-10-09 | Opto Tech Corporation | Chip-bonding light emitting diode chip |
US8592234B2 (en) | 2006-11-07 | 2013-11-26 | Opto Tech Corporation | Method for manufacturing a LED |
JP2015049852A (ja) * | 2013-09-04 | 2015-03-16 | 大日本印刷株式会社 | タッチパネルセンサおよびタッチ位置検出機能付き表示装置 |
Also Published As
Publication number | Publication date |
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TWI342074B (ja) | 2011-05-11 |
JP2005044849A (ja) | 2005-02-17 |
JP3951300B2 (ja) | 2007-08-01 |
TW200511610A (en) | 2005-03-16 |
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