WO2004077579A1 - 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
- Publication number
- WO2004077579A1 WO2004077579A1 PCT/JP2003/016322 JP0316322W WO2004077579A1 WO 2004077579 A1 WO2004077579 A1 WO 2004077579A1 JP 0316322 W JP0316322 W JP 0316322W WO 2004077579 A1 WO2004077579 A1 WO 2004077579A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- light
- light emitting
- compound semiconductor
- main
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 109
- 229910052751 metal Inorganic materials 0.000 claims abstract description 109
- 239000000758 substrate Substances 0.000 claims abstract description 80
- 239000004065 semiconductor Substances 0.000 claims abstract description 52
- 150000001875 compounds Chemical class 0.000 claims abstract description 44
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000009792 diffusion process Methods 0.000 claims description 28
- 238000000605 extraction Methods 0.000 claims description 20
- 230000000903 blocking effect Effects 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 13
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 125000005842 heteroatom Chemical group 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 2
- 238000010030 laminating Methods 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 abstract description 2
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- 239000013078 crystal Substances 0.000 description 20
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 16
- 230000000694 effects Effects 0.000 description 14
- 238000002310 reflectometry Methods 0.000 description 13
- 238000005253 cladding Methods 0.000 description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 11
- 239000010936 titanium Substances 0.000 description 11
- 238000005275 alloying Methods 0.000 description 8
- 238000005530 etching Methods 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 239000010408 film Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 229910000980 Aluminium gallium arsenide Inorganic materials 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000002019 doping agent Substances 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 238000007738 vacuum evaporation Methods 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical group [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- the present invention relates to a light emitting device and a method for manufacturing the same.
- a light-emitting device having a light-emitting layer portion formed of an AlGaInP mixed crystal has a thin A1GaInP (or GaInP) active layer and a bandgap larger than n.
- a high-luminance element can be realized by adopting a double hetero structure sandwiched between the type A 1 GaInP clad layer and the p-type A 1 GaInP clad layer.
- Such an AlGaInP double heterostructure utilizes the fact that the A1GaInP mixed crystal lattice-matches with GaAs to form A1GaInP on the GaAs single crystal substrate.
- Each layer made of InP mixed crystal can be formed by epitaxial growth.
- a GaAs single crystal substrate is often used as it is as an element substrate.
- the A1GaInP mixed crystal constituting the light-emitting layer has a larger band gap than GaAs, the emitted light is absorbed by the GaAs substrate, making it difficult to obtain sufficient light extraction efficiency. There is.
- the element substrate is required to have a conductive property that can withstand it.
- the element substrate is made of a semiconductor, it does not necessarily have sufficient conductivity to allow a large current to flow through the light emitting layer.
- An object of the present invention is to provide a light emitting element having good conductivity in a light emitting element having a structure in which a light emitting layer portion and a semiconductor element substrate are bonded via a metal layer, and a method for manufacturing the same. is there. Disclosure of the invention
- a first main surface of the compound semiconductor layer having a 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 on a second main surface side of the compound semiconductor layer.
- the element substrate includes a Si substrate having a p-type conductivity
- a contact layer having A1 as a main component is formed immediately above the main surface of the element substrate on the main metal layer side.
- main component and “main component” mean a component having the highest mass content.
- the “main metal layer” is a metal layer located between the compound semiconductor layer and the contact layer, and has a role of forming a reflection surface and bonding the compound semiconductor layer and the contact layer. Refers to the metal layer that carries the follow.
- the diffusion blocking layer and the light emitting layer portion side bonding metal layer which will be described later, do not belong to the main metal layer.
- the element substrate is constituted by a silicon substrate having a p-type conductivity (hereinafter also referred to as p-type Si or p-Si), and has a main metal layer side.
- a contact layer containing A 1 (aluminum) as the main component is formed directly on the main surface. Since A1 and p-type Si form a good ohmic junction, the series resistance of the light-emitting element is particularly high when the resistivity of p-type Si is in the range of 1 to l ⁇ Q'cm to 10 ⁇ .cm. As a result, an excessive increase in the forward voltage can be effectively suppressed.
- the effect of reducing the contact resistance can be enhanced by performing the alloying heat treatment of A1 and the p-type Si at, for example, 300 ° C. or more and 65 ° C. or less.
- the light emitting layer portion is located on the light extraction surface side! ) -Type compound semiconductor layer, an n-type compound semiconductor layer is located on the main metal layer side, and the 11-type compound semiconductor layer is coupled to the p-type Si substrate via the main metal layer.
- the layer located on the substrate side has the same conductivity type as that of the substrate (for example, the substrate has:
- the layer located on the opposite side (light extraction surface side) is of a conductivity type different from the conductivity type of the substrate (for example, n-type if the substrate is p-type).
- the light emitting device of the present invention has a configuration in which the compound semiconductor layer and the device substrate are bonded via the main metal layer, and is a combination of different conductivity types such as a p-type Si substrate and an n-type compound semiconductor layer.
- the positional relationship of the conductivity type of the light emitting layer is as described above. Is not restricted.
- an n-type compound semiconductor layer is provided on the p-type Si substrate side (main metal layer side) in the light emitting layer portion, and on the light extraction surface side! ) Type compound semiconductor layer. Further, the light emitting layer portion is formed between a p-type clad layer as a p-type compound semiconductor layer, an n-type clad layer as an n-type compound semiconductor layer, and a p-type clad layer and an n-type clad layer.
- n-type cladding layer and the main metal layer are preferably formed in direct contact with each other in order to increase the light extraction efficiency by reflection.
- a diffusion barrier is provided between the contact layer and the main metal layer, which is formed of a conductive material, and which prevents diffusion of the A1 component of the contact layer into the main metal layer.
- a configuration in which layers are interposed can be employed.
- the A1 component which is the main component of the layer, diffuses into the main metal layer and reacts (for example, a metallurgical reaction such as eutectic / intermetallic compound formation), which may alter the main metal layer. .
- the diffusion of the A1 component from the contact layer to the main metal layer is blocked by the diffusion blocking layer, and the main metal layer is degraded by the reaction with the A1 component. Can be effectively suppressed.
- defects such as a decrease in the reflectance of the reflection surface formed by the main metal layer and a decrease in the adhesion strength between the main metal layer and the compound semiconductor layer are effectively suppressed, and the product yield of the light emitting device due to these defects is reduced. Is unlikely to decrease.
- the diffusion blocking layer is specifically composed of 1 ⁇ and 1 ⁇
- a diffusion-blocking metal layer containing any one of the following as a main component can be obtained.
- T i or N i as the main component Such a metal is particularly excellent in the effect of suppressing the diffusion of the A1 component into the Au-based layer, and thus can be suitably used in the present invention. Further, it is desirable that the thickness of the metal layer for preventing diffusion is at least 11 11 111 and at most 10 111.
- the diffusion preventing metal layer may be specifically made of pure Ti or pure Ni for industrial use.However, as long as the effect of preventing the diffusion of the A1 component into the Au-based layer is not impaired. Thus, it is possible to contain a minor component.
- the addition of an appropriate amount of Pd has the effect of improving the corrosion resistance of a metal containing Ti or Ni as a main component. Also, an alloy of Ti and Ni can be used.
- a reflection surface can be formed by the Au-based layer.
- the Au-based layer is chemically stable and is unlikely to cause a deterioration in reflectance due to oxidation or the like, and thus is suitable as a material for forming the reflection surface. Also, as described above, even if there is a possibility that a metallurgical reaction may occur between the contact layer and the Au-based layer, the diffusion blocking layer may be interposed between the contact layer and the Au-based layer. A reflective surface with good reflectivity can be formed by the Au-based layer without any problem.
- a light-emitting layer-side-side bonding metal layer containing Au as a main component is provided between the Au-based layer and the compound semiconductor layer. It can be arranged in a distributed manner on top.
- the Au-based layer forms a part of a current supply path to the light emitting layer.
- the contact resistance increases and the series resistance increases, which may lower the luminous efficiency.
- the contact resistance can be reduced by joining the Au-based layer to the light emitting layer portion via the Au-based junction metal layer.
- the Au-based bonding metal layer requires a relatively large amount of alloying components necessary for ensuring contact, and the reflectivity is slightly inferior. Therefore, if the light-emitting layer-side bonding metal layer is dispersedly formed on the main surface of the Au-based layer, the high reflectivity of the Au-based layer can be secured in a region where the light-emitting layer-side bonding metal layer is not formed. .
- the compound semiconductor layer in contact with the light-emitting layer is formed of an n-type III- In the case of a V group compound semiconductor (for example, (A l x G ai _ x ) y In x- . Y P (0 ⁇ x ⁇ 1, 0 ⁇ y ⁇ 1)), AuGeN i
- a bonding metal layer particularly enhances the effect of reducing the contact resistance.
- an Au GeNi junction metal layer can be formed on the main surface on the bonding side of the compound semiconductor layer, and an Au-based layer can be formed so as to cover the Au GeNi junction metal layer.
- the alloying heat treatment of the AuGeNi junction metal layer and the compound semiconductor layer at, for example, 350 ° C. or more and 500 ° C. or less, the effect of reducing the contact resistance is enhanced.
- the formation area ratio of the light-emitting layer-side bonding metal layer to the Au-based layer (the value obtained by dividing the light-emitting layer-side bonding metal layer formation area by the total area of the Au-based layer) ) Should be 1% or more and 25% or less.
- the area ratio of the bonding metal layer on the light emitting layer side is less than 1%, the effect of reducing the contact resistance is not sufficient, and when it exceeds 25%, the reflection intensity is reduced.
- the reflectance of the Au-based layer can be reduced in a region where the light-emitting layer-side bonding metal layer is not formed. Can be further enhanced.
- the reflection surface may be formed by an Ag-based layer containing Ag as a main component and interposed between the Au-based layer and the compound semiconductor layer.
- the Ag-based layer is less expensive than the Au-based layer, and exhibits good reflectance over almost the entire visible light wavelength range (350 nm or more to 700 nm). small. As a result, high light extraction efficiency can be realized regardless of the emission wavelength of the device. Also, compared to a metal such as A1, a decrease in reflectance due to the formation of an oxide film or the like is less likely to occur.
- Figure 6 shows the reflectivity of various mirror-polished metal surfaces.
- the plot point “K” is the reflectivity of Ag
- the plot point “ ⁇ ” is the reflectivity of Au
- the plot point “A” is A. 1 is the reflectivity.
- the plot point “X” is for the Ag PdCu alloy.
- the reflectivity of Ag is 350 nm or more and 700 nm or less (and the infrared region longer than that), and particularly, the visible light reflectance is particularly good at 380 nm or more and 700 nm or less. You.
- Au is a colored metal, and as can be seen from the reflectance shown in Fig. 6, there is strong absorption in the visible light region at a wavelength of 670 nm or less (especially at 650 nm or less: If the peak emission wavelength of the light-emitting layer is below 670 nm, the reflectance is significantly reduced. As a result, the luminous intensity tends to decrease, and the spectrum of the extracted light is different from the original luminescent spectrum due to absorption, and the luminous color tone is likely to change.
- Ag has a very good reflectance even in the visible light region with a wavelength of 670 nm or less.
- the reflection surface of the Ag-based layer has much higher light extraction than the Au-based metal. Efficiency can be realized.
- the reflectance does not decrease significantly, but the reflectance at the visible light castle has a slightly lower value (for example, 85 to 9 2%).
- the reflectance is better than A1 at wavelengths of 400 nm or more (especially 450 nm or more).
- the reflectance of A1 in Fig. 6 was measured on the mirror-finished A1 surface by mechanical polishing and chemical polishing while suppressing the formation of the surface oxide film. Due to the thicker layer, the reflectivity may be further reduced than the data shown in FIG. In the case of Ag, in FIG. 6, the reflectance is inferior to A1 in the short wavelength region from 350 nm to 400 nm, but the oxide film is much less likely to be formed than A1. Therefore, when a reflective metal layer is actually formed on a light emitting element, it is possible to achieve a reflectance higher than A1 even in this wavelength region by employing an Ag-based layer. Also in this wavelength range, the reflectivity of Ag is higher than that of Au.
- the Ag-based layer has a thickness of 350 nm or more and 670 nm or less (preferably In the case of a light emitting layer having a peak emission wavelength in the wavelength range of from 400 nm to 670 nm, more preferably from 450 nm to 600 nm, the light extraction efficiency is improved by A 1 or A It can be said that it becomes particularly noticeable over u.
- the light emitting layer having the peak emission wavelength as described above is, for example, (A l x G ai _ x ) yln — yP (where 0 ⁇ ⁇ ⁇ 1, 0 ⁇ y ⁇ 1) or In x G a y A 1 x — y N (0 ⁇ x ⁇ 1, 0 ⁇ y ⁇ 1, x + y ⁇ 1) indicates that the first conductivity type cladding layer, active layer, and second conductivity type cladding layer are in this order. It can be configured as having a laminated double-headed structure.
- an Ag-based junction metal layer mainly composed of Ag is provided between the Ag-based layer and the compound semiconductor layer as a light-emitting layer-side junction metal layer. It can be arranged in a dispersed form on the main surface of the Ag-based layer.
- the Ag-based junction metal layer is formed by forming the compound semiconductor layer in contact therewith with an n-type III-V compound semiconductor (for example, the aforementioned (Al x G a to J y I ni _ y P (0 ⁇ x ⁇ In the case of 1, 0 ⁇ y ⁇ 1)), the effect of reducing the contact resistance is particularly enhanced by employing the AgGeNi junction metal layer.
- the formation area ratio of the Ag-based bonding metal layer on the light emitting layer side to the Ag-based layer is preferably 1% or more and 25% or less, as in the case of the Au-based bonding metal layer described above.
- the Au-based layer may have a bonding layer.
- the main surface on the side opposite to the light extraction surface of the compound semiconductor layer is used as a bonding-side main surface, and Au is used as a main component on the bonding-side main surface.
- a first Au-based layer to be the bonding layer is disposed, and a main surface of the element substrate, which is to be positioned on the light emitting layer side, is a bonding-side main surface;
- the element substrate and the compound semiconductor layer when bonding the element substrate and the compound semiconductor layer, the element substrate and the compound semiconductor layer should be laminated via an Au-based layer, and then bonded and heat-treated. Can be performed.
- the first and second Au-based layers are separately formed on the compound semiconductor layer side and the element substrate side, and these are adhered to each other in close contact with each other. Since the Au-based layers are easily integrated even at a relatively low temperature, sufficient bonding strength can be obtained even at a low heat treatment temperature for bonding.
- an electrochemical film forming method such as an electroless plating or an electrolytic plating may be employed. You can also. BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is a schematic diagram showing a first embodiment of a light emitting element to which the present invention is applied in a laminated structure.
- FIG. 2 is an explanatory view showing an example of a manufacturing process of the light emitting device of FIG.
- FIG. 3 is a schematic view showing a second embodiment of a light emitting element to which the present invention is applied in a laminated structure.
- FIG. 4 is an explanatory view showing one example of a manufacturing process of the light emitting device of FIG.
- FIG. 5 is an explanatory view showing another example of the manufacturing process of the light emitting device of FIG.
- FIG. 6 is a diagram showing the reflectivity of various metals. BEST MODE FOR CARRYING OUT THE INVENTION
- 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 is formed on a first main surface of a p-Si substrate 7 made of a single crystal of p-type Si (silicon), which is a conductive substrate forming an element substrate, via a main metal layer 10. It has a structure in which the light emitting layer part 24 is bonded.
- the layer 5 is a first conductivity type cladding layer, in this embodiment, a p-type (A 1 z G az ) y Ini — y P (where x and z 1) force, a p-type cladding layer 6,
- the second conductivity type clad layer different from the first conductivity type clad layer in the present embodiment, n type (A l ⁇ G a — z ) yli ⁇ — y P (where x ⁇ z ⁇ l) It has a structure sandwiched between the cladding layer 4 and, according to the composition of the active layer 5, the emission wavelength is in a range from green to red (the emission wavelength (peak emission wavelength) is 550 nm or more and 670 ⁇ or less).
- the ⁇ -type A 1 G a In P clad layer 6 is disposed on the metal electrode 9 side, and the n-type A 1 G a In P clad layer is disposed on the main metal layer 10 side.
- the layer 4 is arranged, so that the polarity of the current is applied to the metal electrode 9 side. Positive there.
- the "non-doped” means an "not intentionally added with a dopant", the normal manufacturing process, the content of the dopant component inevitably mixed (eg if 1 0 13 ⁇ 1 0 16 / cm 3 degrees the upper limit) are not excluded also.
- 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 20 is formed at substantially the center of the main surface.
- a metal electrode (for example, an Au electrode) 9 for applying a light emission drive voltage to the layer portion 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.
- the P-Si substrate 7 is manufactured by slicing and polishing an Si single crystal ingot, and has a thickness of, for example, 100 m or more and 500 // m or less. Then, it is bonded to the light emitting layer unit 24 with the main metal layer 10 interposed therebetween.
- the main metal layer 10 is entirely configured as an Au-based layer.
- an AuGe Ni joint metal layer 32 (eg, Ge: 15% by mass, Ni: 10% by mass) as a light emitting layer portion side joining metal layer. ) Is formed, contributing to the reduction of the series resistance of the device.
- AuG e Ni bonding metal layer 3 2 It is dispersed and formed on the main surface of the metal layer 10, and its formation area ratio is 1% or more and 25% or less.
- a first A1 contact layer 31 as a substrate-side bonding metal layer (for example, A1: 99. 9% by mass).
- a metal electrode (back surface electrode: for example, an Au electrode) 15 is formed on the back surface of the p-Si substrate 7 so as to cover the entire surface.
- a second A1 contact layer 16 (for example, A1: 99.9% by mass) is interposed between the metal electrode 15 and the p_Si substrate 7.
- the entire surface of the first A1 contact layer 31 is covered with a titanium (T i) layer 11 as a diffusion blocking layer.
- the thickness of the Ti layer is 1 nm or more and 10 ⁇ m or less (600 nm in the present embodiment).
- the diffusion blocking layer may be a nickel (Ni) layer instead of the Ti layer.
- a main metal layer 10 (Au-based layer) is arranged so as to cover the entire surface of the Ti layer 11 so as to be in contact therewith.
- the Au-based layer is made of pure Au or an 811 alloy having an Au content of 95% by mass or more. Light from the light emitting layer section 24 is extracted in a form in which light reflected by the main metal layer 10 is superimposed on light directly radiated to the light extraction surface side.
- the thickness of the main metal layer 10 is desirably 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 the thickness is appropriately determined in consideration of the cost (for example, about 1 ⁇ ).
- 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 growing a light emitting layer, for example, by 0.5
- the release layer 3 composed of im and A1As is grown, for example, by 0.5 m
- the current diffusion layer 20 composed of p-type AlGaAs is grown, for example, by 5 / ⁇ in this order.
- Type 1 G a InP cladding layer 6 0.6 ⁇ A 1 G a InP active layer (non-doped) 5, and 1 ⁇ m n-type A 1 G a
- the InP cladding layer 4 is epitaxially grown in this order.
- an AuGeNi junction 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.
- the first Au-based layer 10a is formed so as to cover the AuGeNi junction metal layer 32.
- An alloying layer is formed between the light emitting layer portion 24 and the AuGeNi bonded metal layer 32 by the above alloying heat treatment, and the series resistance is significantly reduced.
- Step 3 a separately prepared p-Si substrate 7
- the first and second A1 contact layers 31, 16 to be the substrate-side bonding metal layers are formed on both main surfaces (boron-doped, resistivity approx. 8 ⁇ cm), and the temperature between 300 ° C and 650 ° C Perform alloying heat treatment in the temperature range. Then, on the first A1 contact layer 31, a Ti layer 11 (thickness: for example, 600 nm) and a second Au-based layer 10b are formed in this order. On the second A1 contact layer 16, a back electrode layer 15 (for example, one made of Au-based metal) is formed. In the above steps, each metal layer can be formed by using sputtering or vacuum evaporation.
- the second Au-based layer 10b on the p-Si substrate 7 side is overlaid and pressed on the first Au-based layer 10a formed on the light emitting layer section 24, and pressed.
- the substrate bonded body 50 is formed.
- the Si substrate 7 is bonded to the light emitting layer section 24 via the first Au-based layer 10a and the second Au-based layer 10b.
- the first Au-based layer 10a and the second Au-based layer 10b are integrated into the main metal layer 10 by the above-described bonding heat treatment. Since the first Au-based layer 10a and the second Au-based layer 10b are mainly composed of Au, which is hardly oxidized, the above-mentioned bonding heat treatment can be performed without any problem, for example, even in the air.
- a Ti layer 11 functioning as a diffusion blocking layer is interposed between the second Au-based layer 10b and the first A1 contact layer 31.
- the diffusion of the A1 component from the first A1 contact layer 31 to the second Au system layer 10b is blocked by the Ti layer 11 and the second Au
- the exudation of the A1 component to the first Au-based layer 10a side integrated by bonding the system layer 1Ob and, consequently, is effectively suppressed.
- it is possible to prevent a problem that the finally obtained reflection surface of the main metal layer 10 is discolored to purple due to the A 1 component, thereby realizing good reflectance.
- the bonding strength between the p-Si substrate 7 and the light emitting layer (compound semiconductor layer) 24 by the main metal layer 10 can be maintained high.
- the substrate bonded body 50 is immersed in an etching solution composed of, for example, a 10% aqueous hydrofluoric acid solution, and A 1 A formed between the buffer layer 2 and the light emitting layer portion 24 is formed.
- an etching solution composed of, for example, a 10% aqueous hydrofluoric acid solution
- a 1 A formed between the buffer layer 2 and the light emitting layer portion 24 is formed.
- the GaAs single crystal substrate 1 is etched away together with the GaAs buffer layer 2 using a hydrogen oxide mixed solution, and then a second etching solution (for example, hydrochloric acid) having a selective etching property with respect to A 1 InP. (A hydrofluoric acid may be added for removing the A1 oxide layer) to remove the etch stop layer.
- a second etching solution for example, hydrochloric acid
- the electrode 9 for wire bonding (bonding pad: FIG. 4) is formed so as to cover a part of the main surface of the current diffusion layer 20 exposed by removing the GaAs single crystal substrate 1. 1) is formed. Thereafter, a semiconductor chip is diced by a usual method, fixed to a support, wire-bonded to a lead wire and the like, and then sealed with a resin to obtain a final light emitting element.
- the first Au-based layer 100a forms the reflection surface.
- the light-emitting-layer-side bonding metal layer is formed of an Ag-based bonding metal made of AgGeNi (eg, Ge: 15% by mass, Ni: 10% by mass).
- Layer 1 32 is dispersedly formed.
- the other parts are the same as those of the light emitting device 100 in FIG. FIG. 4 shows an example of the manufacturing process. The difference from the manufacturing process of FIG.
- step 2 is that in step 2, instead of the Au-based bonding metal layer 32, the Ag-based bonding metal layer 13 2 is dispersed and formed, and the temperature is 350 ° C. or higher and 660 ° C. An alloying heat treatment is performed in a temperature range of C or lower, and thereafter, an Ag-based layer 10c and a first Au-based layer 10a are formed in this order. Other than this, it is basically the same as Fig. 2.
- the following method is preferred. That is, as shown in Step 3, the outer peripheral edge of the Ag-based layer 10c is made smaller than the outer peripheral edge of the first Au-based layer 10a. Is formed in an area larger than that of the Ag-based layer 10c so that is located inside. As a result, the Ag-based layer 10c is surrounded by the first Au-based layer 10a, and the outer peripheral surface of the Ag-based layer 10c is formed outside the first corrosion-resistant first Au-based layer 10a.
- the GaAs single crystal substrate 1 Since it is protected by the peripheral portion 10e, even if the light emitting layer growth substrate (GaAs single crystal substrate 1) is etched in step 5, the effect is less likely to reach the Ag-based layer 10c. .
- the G a As 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 etching solution, Ag is particularly easily corroded by the etching solution.
- the GaAs single crystal substrate 1 can be dissolved and removed without any problem.
- each layer of the light emitting layer section 24 can be formed of A 1 G a In N mixed crystal.
- the light emitting layer growth substrate for growing the light emitting layer portion 24 for example, a sapphire substrate (insulator) or a SiC single crystal substrate is used instead of the GaAs single crystal substrate.
- each layer of the light emitting layer section 24 is composed of the n-type cladding layer 4, the active layer 5, and the p-type cladding layer 6 in this order from the substrate side.
- Type club A pad layer, an active layer, and an n-type clad layer may be formed in this order.
- the main metal layer 10 is connected to either one of the p-Si substrate 7 (element substrate) and the light emitting layer portion 24 (compound semiconductor layer) (in FIG. 5, It may be formed only on the light emitting layer portion 24 side) and bonded.
- the bonding heat treatment temperature (step 4) must be set slightly higher than that of Fig. 2 from 200 ° C to 700 ° C, but the Ti layer (or Ni layer) is used as a diffusion blocking layer. By disposing 11, the diffusion of A 1 into the main metal layer 10 can be sufficiently suppressed, so that the shellfish can be forked without any problem.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Led Devices (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/546,201 US20060145177A1 (en) | 2003-02-28 | 2003-12-19 | Light emitting device and process for fabricating the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003053690A JP2004266039A (ja) | 2003-02-28 | 2003-02-28 | 発光素子及び発光素子の製造方法 |
JP2003-53690 | 2003-02-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004077579A1 true WO2004077579A1 (ja) | 2004-09-10 |
Family
ID=32923438
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/016322 WO2004077579A1 (ja) | 2003-02-28 | 2003-12-19 | 発光素子及び発光素子の製造方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20060145177A1 (ja) |
JP (1) | JP2004266039A (ja) |
CN (1) | CN100459182C (ja) |
TW (1) | TW200418208A (ja) |
WO (1) | WO2004077579A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100386898C (zh) * | 2005-06-27 | 2008-05-07 | 金芃 | 导电和绝缘准氧化锌衬底及垂直结构的半导体发光二极管 |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI243399B (en) * | 2003-09-24 | 2005-11-11 | Sanken Electric Co Ltd | Nitride semiconductor device |
TWI240439B (en) * | 2003-09-24 | 2005-09-21 | Sanken Electric Co Ltd | Nitride semiconductor device and manufacturing method thereof |
US7148075B2 (en) * | 2004-06-05 | 2006-12-12 | Hui Peng | Vertical semiconductor devices or chips and method of mass production of the same |
US7274040B2 (en) * | 2004-10-06 | 2007-09-25 | Philips Lumileds Lighting Company, Llc | Contact and omnidirectional reflective mirror for flip chipped light emitting devices |
US7462560B2 (en) * | 2005-08-11 | 2008-12-09 | United Microelectronics Corp. | Process of physical vapor depositing mirror layer with improved reflectivity |
CN100386899C (zh) * | 2006-05-26 | 2008-05-07 | 北京工业大学 | 高效高亮全反射发光二极管及制作方法 |
JP4962840B2 (ja) * | 2006-06-05 | 2012-06-27 | 信越半導体株式会社 | 発光素子及びその製造方法 |
TWI305960B (en) * | 2006-06-16 | 2009-02-01 | Opto Tech Corp | Light emitting diode and method manufacturing the same |
CN102361052B (zh) * | 2006-06-23 | 2015-09-30 | Lg电子株式会社 | 具有垂直拓扑的发光二极管及其制造方法 |
JP4836769B2 (ja) * | 2006-12-18 | 2011-12-14 | スタンレー電気株式会社 | 半導体発光装置およびその製造方法 |
CN101304058B (zh) * | 2007-05-09 | 2010-05-26 | 清华大学 | 发光二极管 |
KR101064082B1 (ko) * | 2009-01-21 | 2011-09-08 | 엘지이노텍 주식회사 | 발광 소자 |
WO2012018997A2 (en) * | 2010-08-06 | 2012-02-09 | Semprius, Inc. | Materials and processes for releasing printable compound semiconductor devices |
US9012948B2 (en) | 2010-10-04 | 2015-04-21 | Epistar Corporation | Light-emitting element having a plurality of contact parts |
CN103346225A (zh) * | 2013-06-21 | 2013-10-09 | 杭州格蓝丰纳米科技有限公司 | 垂直型石墨烯led芯片 |
US9058990B1 (en) * | 2013-12-19 | 2015-06-16 | International Business Machines Corporation | Controlled spalling of group III nitrides containing an embedded spall releasing plane |
CN103779461A (zh) * | 2014-02-13 | 2014-05-07 | 马鞍山太时芯光科技有限公司 | 一种衬底及其回收再利用的方法 |
KR102048378B1 (ko) | 2014-06-18 | 2019-11-25 | 엑스-셀레프린트 리미티드 | 트랜스퍼가능한 반도체 구조체들의 방출을 제어하기 위한 시스템들 및 방법들 |
US10297502B2 (en) | 2016-12-19 | 2019-05-21 | X-Celeprint Limited | Isolation structure for micro-transfer-printable devices |
US10832935B2 (en) | 2017-08-14 | 2020-11-10 | X Display Company Technology Limited | Multi-level micro-device tethers |
US10832934B2 (en) | 2018-06-14 | 2020-11-10 | X Display Company Technology Limited | Multi-layer tethers for micro-transfer printing |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62188385A (ja) * | 1986-02-14 | 1987-08-17 | Omron Tateisi Electronics Co | 半導体発光素子 |
JPH0429374A (ja) * | 1990-05-24 | 1992-01-31 | Omron Corp | 面出射型半導体発光素子およびその作製方法 |
JPH05251739A (ja) * | 1992-03-06 | 1993-09-28 | Toshiba Corp | 半導体発光デバイス |
JPH0758114A (ja) * | 1993-08-19 | 1995-03-03 | Toshiba Corp | 半導体装置 |
JPH098403A (ja) * | 1995-06-15 | 1997-01-10 | Nichia Chem Ind Ltd | 窒化物半導体素子の製造方法及び窒化物半導体素子 |
JPH09129923A (ja) * | 1995-11-01 | 1997-05-16 | Sumitomo Chem Co Ltd | 発光素子 |
JPH09129647A (ja) * | 1995-10-27 | 1997-05-16 | Toshiba Corp | 半導体素子 |
JPH11168236A (ja) * | 1997-12-03 | 1999-06-22 | Rohm Co Ltd | 光半導体チップおよび光半導体チップの製造方法 |
JP2001007399A (ja) * | 1999-06-23 | 2001-01-12 | Toshiba Corp | 半導体発光素子 |
JP2001217461A (ja) * | 2000-02-04 | 2001-08-10 | Matsushita Electric Ind Co Ltd | 複合発光素子 |
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 |
US20020008325A1 (en) * | 2000-05-11 | 2002-01-24 | Mitutoyo Corporation | Functional device unit and method of producing the same |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5641992A (en) * | 1995-08-10 | 1997-06-24 | Siemens Components, Inc. | Metal interconnect structure for an integrated circuit with improved electromigration reliability |
JPH1117216A (ja) * | 1997-06-27 | 1999-01-22 | Res Dev Corp Of Japan | 発光素子材料の製造方法 |
JP3469484B2 (ja) * | 1998-12-24 | 2003-11-25 | 株式会社東芝 | 半導体発光素子およびその製造方法 |
JP2002280415A (ja) * | 2001-03-16 | 2002-09-27 | Matsushita Electric Ind Co Ltd | 半導体装置 |
US6759689B2 (en) * | 2002-08-07 | 2004-07-06 | Shin-Etsu Handotai Co., Ltd. | Light emitting element and method for manufacturing the same |
-
2003
- 2003-02-28 JP JP2003053690A patent/JP2004266039A/ja active Pending
- 2003-12-19 US US10/546,201 patent/US20060145177A1/en not_active Abandoned
- 2003-12-19 WO PCT/JP2003/016322 patent/WO2004077579A1/ja active Application Filing
- 2003-12-19 CN CNB2003801099809A patent/CN100459182C/zh not_active Expired - Fee Related
- 2003-12-22 TW TW092136349A patent/TW200418208A/zh not_active IP Right Cessation
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62188385A (ja) * | 1986-02-14 | 1987-08-17 | Omron Tateisi Electronics Co | 半導体発光素子 |
JPH0429374A (ja) * | 1990-05-24 | 1992-01-31 | Omron Corp | 面出射型半導体発光素子およびその作製方法 |
JPH05251739A (ja) * | 1992-03-06 | 1993-09-28 | Toshiba Corp | 半導体発光デバイス |
JPH0758114A (ja) * | 1993-08-19 | 1995-03-03 | Toshiba Corp | 半導体装置 |
JPH098403A (ja) * | 1995-06-15 | 1997-01-10 | Nichia Chem Ind Ltd | 窒化物半導体素子の製造方法及び窒化物半導体素子 |
JPH09129647A (ja) * | 1995-10-27 | 1997-05-16 | Toshiba Corp | 半導体素子 |
JPH09129923A (ja) * | 1995-11-01 | 1997-05-16 | Sumitomo Chem Co Ltd | 発光素子 |
JPH11168236A (ja) * | 1997-12-03 | 1999-06-22 | Rohm Co Ltd | 光半導体チップおよび光半導体チップの製造方法 |
JP2001007399A (ja) * | 1999-06-23 | 2001-01-12 | Toshiba Corp | 半導体発光素子 |
JP2001217461A (ja) * | 2000-02-04 | 2001-08-10 | Matsushita Electric Ind Co Ltd | 複合発光素子 |
US20020008325A1 (en) * | 2000-05-11 | 2002-01-24 | Mitutoyo Corporation | Functional device unit and method of producing the same |
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 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100386898C (zh) * | 2005-06-27 | 2008-05-07 | 金芃 | 导电和绝缘准氧化锌衬底及垂直结构的半导体发光二极管 |
Also Published As
Publication number | Publication date |
---|---|
CN1754267A (zh) | 2006-03-29 |
JP2004266039A (ja) | 2004-09-24 |
CN100459182C (zh) | 2009-02-04 |
TWI330411B (ja) | 2010-09-11 |
TW200418208A (en) | 2004-09-16 |
US20060145177A1 (en) | 2006-07-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2004077579A1 (ja) | 発光素子及び発光素子の製造方法 | |
JP4050444B2 (ja) | 発光素子及びその製造方法 | |
TWI266462B (en) | Nitride-based compound semiconductor light emitting device, structural unit thereof, and fabricating method thereof | |
JP4449405B2 (ja) | 窒化物半導体発光素子およびその製造方法 | |
TW200828628A (en) | High efficiency light-emitting diode and method for manufacturing the same | |
WO2006006556A1 (ja) | 半導体発光素子 | |
JP2004207508A (ja) | 発光素子及びその製造方法 | |
JP2004193338A (ja) | 窒化物系化合物半導体発光素子およびその製造方法 | |
JP4110524B2 (ja) | 発光素子及び発光素子の製造方法 | |
JP4121551B2 (ja) | 発光素子の製造方法及び発光素子 | |
JP3997523B2 (ja) | 発光素子 | |
JP3951300B2 (ja) | 発光素子及び発光素子の製造方法 | |
JP3950801B2 (ja) | 発光素子及び発光素子の製造方法 | |
JP2005197296A (ja) | 発光素子及びその製造方法 | |
JP4062111B2 (ja) | 発光素子の製造方法 | |
JP4174581B2 (ja) | 発光素子の製造方法 | |
JP5196288B2 (ja) | 発光素子の製造方法及び発光素子 | |
JP4114566B2 (ja) | 半導体貼り合わせ結合体及びその製造方法、並びに発光素子及びその製造方法 | |
JP4120796B2 (ja) | 発光素子及び発光素子の製造方法 | |
JP2005079298A (ja) | 発光素子及び発光素子の製造方法 | |
JP4697650B2 (ja) | 発光素子 | |
JP2004235505A (ja) | 発光素子及び半導体素子用オーミック電極構造 | |
JP2005123530A (ja) | 発光素子の製造方法 | |
JP4918245B2 (ja) | 発光ダイオード及びその製造方法 | |
JP2004146652A (ja) | 半導体発光素子の製法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CN KR US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
ENP | Entry into the national phase |
Ref document number: 2006145177 Country of ref document: US Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10546201 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 20038A99809 Country of ref document: CN |
|
122 | Ep: pct application non-entry in european phase | ||
WWP | Wipo information: published in national office |
Ref document number: 10546201 Country of ref document: US |