WO2004040662A1 - Zn系半導体発光素子およびその製造方法 - Google Patents
Zn系半導体発光素子およびその製造方法 Download PDFInfo
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- WO2004040662A1 WO2004040662A1 PCT/JP2003/013910 JP0313910W WO2004040662A1 WO 2004040662 A1 WO2004040662 A1 WO 2004040662A1 JP 0313910 W JP0313910 W JP 0313910W WO 2004040662 A1 WO2004040662 A1 WO 2004040662A1
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- Prior art keywords
- buffer layer
- substrate
- layer
- heat treatment
- emitting device
- Prior art date
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims description 60
- 239000000872 buffer Substances 0.000 claims abstract description 237
- 238000010438 heat treatment Methods 0.000 claims abstract description 103
- 239000000758 substrate Substances 0.000 claims abstract description 97
- 150000001875 compounds Chemical class 0.000 claims abstract description 55
- 239000010410 layer Substances 0.000 claims description 389
- 239000013078 crystal Substances 0.000 claims description 95
- 230000015572 biosynthetic process Effects 0.000 claims description 76
- 239000011701 zinc Substances 0.000 claims description 71
- 239000000463 material Substances 0.000 claims description 23
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 22
- 229910052760 oxygen Inorganic materials 0.000 claims description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 19
- 239000001301 oxygen Substances 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 15
- 229910052594 sapphire Inorganic materials 0.000 claims description 13
- 239000010980 sapphire Substances 0.000 claims description 13
- 238000002425 crystallisation Methods 0.000 claims description 11
- 230000008025 crystallization Effects 0.000 claims description 11
- 239000011787 zinc oxide Substances 0.000 claims description 11
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 2
- 238000001953 recrystallisation Methods 0.000 abstract description 23
- 239000007789 gas Substances 0.000 description 21
- 230000007547 defect Effects 0.000 description 14
- 239000000470 constituent Substances 0.000 description 13
- 229910052751 metal Inorganic materials 0.000 description 13
- 239000002184 metal Substances 0.000 description 13
- 239000002019 doping agent Substances 0.000 description 11
- 238000001451 molecular beam epitaxy Methods 0.000 description 8
- 229910052738 indium Inorganic materials 0.000 description 7
- 239000011777 magnesium Substances 0.000 description 7
- 229910052733 gallium Inorganic materials 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 238000001947 vapour-phase growth Methods 0.000 description 5
- 229910052725 zinc Inorganic materials 0.000 description 5
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000010030 laminating Methods 0.000 description 4
- 229910052755 nonmetal Inorganic materials 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 239000011669 selenium Substances 0.000 description 4
- 238000004544 sputter deposition Methods 0.000 description 4
- 206010021143 Hypoxia Diseases 0.000 description 3
- 238000004871 chemical beam epitaxy Methods 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 229910052785 arsenic Inorganic materials 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000001272 nitrous oxide Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000004549 pulsed laser deposition Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052711 selenium Inorganic materials 0.000 description 2
- -1 specifically Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 229910052714 tellurium Inorganic materials 0.000 description 2
- RGGPNXQUMRMPRA-UHFFFAOYSA-N triethylgallium Chemical compound CC[Ga](CC)CC RGGPNXQUMRMPRA-UHFFFAOYSA-N 0.000 description 2
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 2
- XCZXGTMEAKBVPV-UHFFFAOYSA-N trimethylgallium Chemical compound C[Ga](C)C XCZXGTMEAKBVPV-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910002601 GaN Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 description 1
- AXAZMDOAUQTMOW-UHFFFAOYSA-N dimethylzinc Chemical compound C[Zn]C AXAZMDOAUQTMOW-UHFFFAOYSA-N 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 229910001195 gallium oxide Inorganic materials 0.000 description 1
- 229910021478 group 5 element Inorganic materials 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- QBJCZLXULXFYCK-UHFFFAOYSA-N magnesium;cyclopenta-1,3-diene Chemical compound [Mg+2].C1C=CC=[C-]1.C1C=CC=[C-]1 QBJCZLXULXFYCK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000001741 metal-organic molecular beam epitaxy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 125000003748 selenium group Chemical group *[Se]* 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- VOITXYVAKOUIBA-UHFFFAOYSA-N triethylaluminium Chemical compound CC[Al](CC)CC VOITXYVAKOUIBA-UHFFFAOYSA-N 0.000 description 1
- OTRPZROOJRIMKW-UHFFFAOYSA-N triethylindigane Chemical compound CC[In](CC)CC OTRPZROOJRIMKW-UHFFFAOYSA-N 0.000 description 1
- IBEFSUTVZWZJEL-UHFFFAOYSA-N trimethylindium Chemical compound C[In](C)C IBEFSUTVZWZJEL-UHFFFAOYSA-N 0.000 description 1
- 238000000927 vapour-phase epitaxy Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 1
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
- H01L33/02—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 semiconductor bodies
- H01L33/26—Materials of the light emitting region
- H01L33/28—Materials of the light emitting region containing only elements of Group II and Group VI of the Periodic Table
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- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02367—Substrates
- H01L21/0237—Materials
- H01L21/0242—Crystalline insulating materials
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02367—Substrates
- H01L21/0237—Materials
- H01L21/02422—Non-crystalline insulating materials, e.g. glass, polymers
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02436—Intermediate layers between substrates and deposited layers
- H01L21/02439—Materials
- H01L21/02469—Group 12/16 materials
- H01L21/02472—Oxides
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02436—Intermediate layers between substrates and deposited layers
- H01L21/02439—Materials
- H01L21/02483—Oxide semiconducting materials not being Group 12/16 materials, e.g. ternary compounds
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02436—Intermediate layers between substrates and deposited layers
- H01L21/02494—Structure
- H01L21/02513—Microstructure
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
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- H01L21/02365—Forming inorganic semiconducting materials on a substrate
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- H01L21/02521—Materials
- H01L21/02565—Oxide semiconducting materials not being Group 12/16 materials, e.g. ternary compounds
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- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
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- H01L21/0257—Doping during depositing
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- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
- H01L21/0257—Doping during depositing
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- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
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- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02612—Formation types
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/34—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies not provided for in groups H01L21/0405, H01L21/0445, H01L21/06, H01L21/16 and H01L21/18 with or without impurities, e.g. doping materials
- H01L21/46—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/428
- H01L21/477—Thermal treatment for modifying the properties of semiconductor bodies, e.g. annealing, sintering
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- H01L33/005—Processes
- H01L33/0083—Processes for devices with an active region comprising only II-VI compounds
- H01L33/0087—Processes for devices with an active region comprising only II-VI compounds with a substrate not being a II-VI compound
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- 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
- H01L33/0095—Post-treatment of devices, e.g. annealing, recrystallisation or short-circuit elimination
Definitions
- the present invention relates to a Zn-based semiconductor light emitting device and a method for manufacturing the same.
- Z ⁇ (dumbbell oxide) is a direct transition semiconductor with a bandgap energy of 3.4 eV. Therefore, Z ⁇ or a Zn-based semiconductor using Z ⁇ as a base material is promising as a material for a light-emitting element capable of emitting light in the blue to ultraviolet range.
- a Zn-based semiconductor light-emitting device has been manufactured by epitaxially growing a light-emitting region made of a Zn-based semiconductor on a substrate.
- a single-crystal laminate to be a buffer layer is formed on a sapphire substrate at a lower temperature than the light-emitting region formation temperature.
- Japanese Patent Application Laid-Open No. 2001-68485 discloses a method in which heat treatment is performed at a temperature substantially equal to the temperature at which the light emitting region is formed, and the surface is flattened to form a buffer layer.
- Zn-based semiconductors including ZnO are one of the attractive points for industrial use in that they are cheaper than other InGaN-based semiconductors that can emit blue light. From this perspective, it is important to manufacture Zn-based semiconductors at the lowest possible cost.
- the present invention has been made in consideration of the above problems, and provides a Zn-based semiconductor light-emitting device that can be easily manufactured and that can improve the quality of a light-emitting region, and a method of manufacturing the same.
- the purpose is to do. Disclosure of the invention
- a first method for manufacturing a Zn-based semiconductor light-emitting device comprises: a buffer made of an In-based compound or a Zn-based compound that is not included in the substrate; Forming a light-emitting region comprising a Zn-based compound on the buffer layer, comprising:
- the laminate After forming a laminate of a polycrystalline layer or an amorphous layer on the main surface of the substrate, and before forming the light emitting region, the laminate is heat-treated to form the buffer layer.
- the present invention is directed to a Zn-based semiconductor light-emitting device whose light-emitting region is made of a Zn-based compound. Also, by improving the formation process of the buffer layer formed between the substrate and the light emitting region, the crystallinity of the light emitting region is improved. Therefore, the characteristic point of the first manufacturing method according to the present invention is that, first, a polycrystalline layer or an amorphous layer made of an In-based compound or a Zn-based compound not included in the substrate is formed on the main surface of the substrate.
- Layer product A layer body hereinafter, also referred to as a pre-buffer layer
- the pre-buffer layer is heat-treated to form a buffer layer.
- the pre-stage buffer layer as a polycrystalline or amorphous layer, it can be formed more easily than forming it as a single-crystal layer. Also, when the first-stage buffer layer is first formed as a polycrystalline layer or an amorphous layer, there is a concern when it is formed as a single-crystal layer.For example, misfit dislocation due to a difference in lattice constant from the substrate, Excessive concentration of threading dislocations growing along the thickness direction along a specific orientation plane can be effectively suppressed. Then, a heat treatment for recrystallization is performed on the preceding buffer layer.
- the processing temperature and the processing time of the heat treatment are appropriately set according to the constituent material of the pre-buffer layer so that at least recrystallization occurs.
- the heat treatment for recrystallization is performed on the preceding buffer layer to form the buffer layer.
- the layer portion near the main surface on the substrate side of the pre-buffer layer proceeds to re-crystallize in such a way as to match the lattice constant and the like caused by the crystal structure of the main surface of the substrate. Recrystallization of the layer near the main surface opposite to the substrate side of the layer proceeds in such a manner as to match the lattice constant of the underlying layer.
- the orientation can be improved, and even if defects such as void defects and the above-mentioned dislocations are incorporated in the preceding buffer layer, they are expected to be reduced in the process of recrystallization by heat treatment. it can.
- recrystallization can progress in a form of relaxing the stress caused by the dislocations during the heat treatment process because the orientation of the dislocations is random in the first place. Can be expected. In this way, a high-quality buffer layer can be easily formed, and the quality of the light-emitting region formed thereon can be improved.
- the heat treatment is performed for recrystallization, the flatness of the main surface of the buffer layer opposite to the substrate side is also improved.
- Zn-based compound constituting the above-mentioned buffer layer specifically, ZnO, Zn Using ⁇ as the base substance, part of the Zn (zinc) site is replaced with Mg (magnesium), etc., and part of the O (oxygen) site in ZnO is S (sulfur), S e ( Those substituted with selenium) or Te (tellurium) can be used. Above all, if a mixed crystal system is used, excessive composition fluctuations and the like may occur, so that Z ⁇ ⁇ is particularly preferable.
- the In-based compound constituting the buffer layer specifically, a known indium-based oxide or tin-added ITO (indium tin oxide) can be used.
- ITO is excellent electrical conductivity (room temperature) 1 0 one 4 Omega cm approximately conductive, said to be suitable materials because it is transparent to visible light region. Furthermore, since ITO has a lattice constant between, for example, a sapphire substrate and Z ⁇ ⁇ , when the substrate is a sapphire substrate and the constituent material of the buffer layer is ITO, the lattice of the substrate and the layer forming the light emitting region are formed. The effect of reducing the constant difference can also be expected.
- the pre-stage buffer layer is formed as a polycrystalline layer or an amorphous layer.
- the substrate is a single crystal substrate
- the laminate is formed as a polycrystalline layer composed of crystal grains oriented in the direction of the main axis of the single crystal substrate. .
- the pre-stage buffer layer is formed as a polycrystal layer
- polycrystals composed of crystal grains oriented in the main axis direction (layer thickness direction) of the single crystal substrate compared to the in-plane direction of the layer A layer can be easily formed. Therefore, it is particularly desirable that the former buffer layer be a polycrystalline layer composed of crystal grains oriented in the layer thickness direction.
- misfit dislocations and threading dislocations described above basically consist of the lattice constant in the in-plane direction on the main surface of the substrate and 'Since it is likely to occur due to the difference from the lattice constant of the material constituting the layer in the in-plane direction of the layer, a polycrystalline layer composed of crystal grains oriented in the thickness direction of the layer is also a single-crystal layer as described above.
- the generation of dislocations and defects can be suppressed more effectively than forming as.
- the laminate to be the pre-stage buffer layer is formed such that columnar crystal grains from the main surface of the substrate to the outermost surface of the laminate are densely arranged on the main surface of the substrate.
- the columnar crystal grains each oriented in the layer thickness direction are densely arranged on the main surface of the substrate.
- These columnar crystal grains are individually formed on the main surface of the substrate.
- a gap is formed between at least some sections (including all sections) in the layer thickness direction between the columnar crystal grains.
- the gap refers to, for example, air or a crystal grain whose diameter is smaller than that of columnar crystal grains.
- the pre-buffer layer By forming the pre-buffer layer as such a polycrystalline layer, in the process of selectively growing columnar crystal grains in the layer thickness direction, growth in the layer in-plane direction is effectively suppressed. As a result, it is possible to more effectively suppress the generation and growth of dislocations and defects generated in the preceding buffer layer.
- the pre-buffer layer is recrystallized by heat treatment, each of the columnar crystal grains can be easily recrystallized as a seed crystal. It is possible to provide a simple buffer layer.
- the pre-buffer layer is formed as columnar crystal grains densely arranged on the main surface of the substrate, but in particular, the columnar crystal grains are formed as the pre-buffer layer. It is desirable to form the outermost surface of the body (the surface opposite to the substrate side) so that at least a gap is formed between itself and the adjacent columnar crystal grains.
- the outermost surface of the pre-buffer layer, which is opposite to the substrate side, is the surface that is closest to the layer that will be the light emitting region, so it is particularly necessary to have excellent crystallinity with reduced dislocations and crystal defects. is there.
- the columnar crystal grains have an average particle size in the layer plane of 5 ⁇ !
- the condition in which the columnar crystal grains are densely arranged means that the surface coverage of the columnar crystal grains in the layer plane is about 50% to about 99%.
- the substrate is a single-crystal substrate
- a laminate serving as a pre-stage buffer layer is formed as an amorphous layer
- the laminate is heat-treated to form a polycrystalline buffer layer. It is characterized by the following.
- the pre-stage buffer layer formed on the main surface of the single crystal substrate is an amorphous layer.
- misfit dislocations caused by a difference in the lattice constant from the substrate and threading dislocations growing along the layer thickness direction are more specific than a polycrystalline layer. It is possible to effectively suppress occurrence along the alignment plane.
- the pre-stage buffer layer is subjected to heat treatment and re-crystallized, the re-crystallization proceeds in a form that is easy to be oriented by using a single crystal substrate. Becomes possible. As a result, it is possible to form a buffer layer having excellent crystallinity, in which dislocations and crystal defects are generated, and the growth thereof is effectively suppressed.
- the pre-buffer layer of the amorphous layer is recrystallized to be polycrystalline
- a single crystal substrate is used, as described above, so that it is easily possible to form polycrystal oriented in the layer thickness direction. It becomes.
- the pre-stage buffer layer is made of an amorphous layer in order to further reduce the occurrence of dislocations and crystal defects, the heat generated by the recrystallization to become polycrystalline
- the processing conditions such as the formation temperature and the formation time when forming the above-mentioned pre-stage buffer layer as a polycrystalline layer, a polycrystalline crystal having the same orientation as described above can be obtained. Can be recrystallized.
- the pre-stage buffer layer as a polycrystalline layer or an amorphous layer, a high-quality buffer layer can be formed more easily than a single-crystal layer.
- the formation temperature is set to at least 400 ° C. or less, the pre-stage buffer layer can be formed as a polycrystalline layer or an amorphous layer.
- the formation temperature of the pre-buffer layer exceeds 400 ° C., the orientation in the in-plane direction of the layer is increased, that is, single crystallization becomes easy to proceed, and the occurrence of dislocations and crystal defects is sufficiently suppressed. It is assumed that it is not possible.
- the lower limit of the formation temperature may be set to normal temperature.
- the crystal state can be adjusted from amorphous to polycrystalline as the temperature is set to a higher temperature.
- an amorphous layer can be formed when the formation temperature is set in a range from room temperature to about 350 ° C, while the formation temperature is raised to a higher temperature.
- a polycrystalline layer can be obtained.
- the temperature of the heat treatment applied to the preceding buffer layer is preferably set to be higher than the formation temperature of the laminate to be the preceding buffer layer.
- the heat treatment applied to the pre-buffer layer is performed in order to obtain a more highly crystalline state by recrystallization. Therefore, the larger the heat energy for recrystallization given by the heat treatment, the better, and the heat energy can be increased by increasing the heat treatment temperature or prolonging the heat treatment time. However, prolonged heat treatment time also leads to a decrease in work efficiency. Therefore, by setting the heat treatment temperature at least higher than the formation temperature of the pre-buffer layer, it is possible to efficiently recrystallize the pre-buffer layer without setting the heat treatment time excessively long. It becomes. By setting the heat treatment temperature in this way, A buffer layer having at least higher orientation than the step buffer layer can be obtained. This is because, as the thermal energy for recrystallization is increased, a buffer layer having a high orientation can be obtained, for example, from amorphous to polycrystalline.
- the temperature of the heat treatment applied to the preceding buffer layer is, of course, preferably as high as higher than the forming temperature of the preceding buffer layer. In particular, it is preferable to set the temperature higher than the forming temperature for forming the light emitting region. desirable. Since the light emitting region is required to have a better crystallinity and be closer to a single crystal (including a single crystal), its formation temperature should be set higher than that of the previous buffer layer. Is a good idea. In addition, the formation temperature of the light emitting region at that time is, for example, in a range of about 300 to 100 ° C., although it depends on the constituent material of the light emitting area.
- the temperature of the heat treatment applied to the pre-stage buffer layer is at least higher than the temperature at which the light emitting region is formed, a buffer layer closer to the crystallinity required for the light emitting region can be obtained.
- the upper limit of the heat treatment temperature applied to the pre-buffer layer is not particularly limited. However, if the temperature is excessively high, the manufacturing cost is increased. Is enough.
- the substrate to be used include anolymium oxide, gallium oxide, magnesium oxide, aluminum nitride, gallium nitride, silicon, silicon carbide, gallium arsenide, and glass.
- a single crystal of aluminum oxide is particularly preferable.
- a sapphire substrate which is a substrate, is suitable for the present invention.
- the use of the sapphire substrate in this way is effective for improving the crystal matching with the Zn-based compound constituting the light emitting region.
- the heat treatment atmosphere in the heat treatment is desirably an oxygen-containing atmosphere.
- the former buffer layer is made of indium tin oxide or zinc oxide.
- the former buffer layer basically has a composition containing oxygen. Therefore, in order to suppress the detachment of the oxygen component during the heat treatment and sufficiently fill predetermined oxygen sites in the crystal without deficiency, it is particularly desirable that the heat treatment atmosphere in the heat treatment be an oxygen-containing atmosphere. As a result, the crystallinity of the buffer layer can be further improved.
- the thickness of the buffer layer be 1 // m or less.
- the pre-buffer layer is subjected to heat treatment for recrystallization to form a buffer layer.At this time, if the thickness of the buffer layer is set to more than 1 Aim, the orientation is easily increased. In some cases, recrystallization cannot be induced, or the heat treatment temperature needs to be excessively high or the heat treatment time needs to be prolonged. Therefore, it is particularly desirable that the thickness of the buffer layer be at least 1 / ira or less.
- the lower limit of the thickness of the buffer layer is not particularly limited.
- the buffer layer when the buffer layer is excessively thin, the function of the buffer layer to relax the lattice constant and the like caused by the difference in the constituent materials between the substrate and the light emitting region is sufficient. Therefore, it is desirable to set the thickness to 5 nm or more.
- a buffer layer made of an In-based compound or a Zn-based compound not included in the substrate is formed on the main surface of the substrate, and a light-emitting region made of a Zn-based compound is formed on the buffer layer.
- the laminate After forming a laminate made of an In-based compound or a Zn-based compound at a temperature lower than the formation temperature of the light-emitting region, and before forming the light-emitting region, the laminate is heat-treated at a temperature higher than the formation temperature of the light-emitting region. To form a buffer layer.
- the second production method of the present invention is, like the first production method described above, an In-based compound.
- the pre-buffer layer is subjected to a heat treatment for recrystallization to form a buffer layer.
- the formation temperature of the pre-buffer layer is lower than the formation temperature of the light-emitting region, and that the heat treatment temperature of the heat treatment applied to the pre-buffer layer is higher than the formation temperature of the light-emitting region. .
- the intention of setting the formation temperature of the pre-stage buffer layer to be lower than the formation temperature of the light-emitting region is to avoid excessive dislocations and crystal defects that may occur when the pre-stage buffer layer is formed as a single-crystal layer. It is to suppress it effectively. In other words, for example, it is not intended to form a single crystal layer using characteristics of free radicals such as radioactive oxygen while lowering the formation temperature using a known RS-MBE apparatus.
- the pre-stage buffer layer is recrystallized at a heat treatment temperature set higher than the formation temperature of the light-emitting region, so that the crystallinity (single-crystal state) required for the light-emitting region is close to or equal to that of the crystal. It becomes possible to easily form a buffer layer with improved orientation to the property. Further, by setting the heat treatment temperature of the heat treatment applied to the pre-stage buffer layer to be higher than the formation temperature of the light emitting region, a high-quality buffer can be obtained without excessively increasing the heat treatment time of the heat treatment. Since the layers can be formed, the manufacturing cost can be effectively reduced.
- the above-described second manufacturing method of the present invention provides high quality by limiting the three-dimensional relationship between the formation temperature of the pre-buffer layer, the heat treatment temperature of the heat treatment applied to the pre-buffer layer, and the formation temperature of the light emitting region. This makes it possible to easily form a simple buffer layer, and thus to improve the quality of the light emitting region.
- a description will be given of a third manufacturing method capable of achieving a similar effect by limiting the magnitude relationship between the temperatures.
- the third manufacturing method of the Z11-based semiconductor S optical device of the present invention
- a buffer layer made of an In-based compound or a Zn-based compound not included in the substrate is formed on the main surface of the substrate, and a light-emitting region made of a Zn-based compound is formed on the buffer layer.
- the laminate After forming a laminate made of an In-based compound or a Zn-based compound at a temperature lower than the formation temperature of the light-emitting region, and before forming the light-emitting region, the laminate is subjected to the formation temperature of the light-emitting region and the laminate.
- the former buffer layer is formed at a temperature lower than the formation temperature of the light emitting region, which is the same as the above-mentioned second manufacturing method.
- the buffer layer is formed by performing a two-stage heat treatment for recrystallization on the former buffer layer. First, the first-stage heat treatment is performed on the first-stage buffer layer at a first heat-treatment temperature located between the formation temperature of the light-emitting region and the first-stage buffer layer. After that, a second-stage heat treatment is performed at a second heat treatment temperature set higher than the formation temperature of the light emitting region.
- the crystallinity can be further improved by forming the buffer layer as follows. That is, in the third production method of the present invention
- the buffer layer is formed by heat-treating a laminate (the preceding buffer layer) serving as the first layer portion of the buffer layer at a first heat treatment temperature, and then forming an In-based compound or a Zn-based compound on the laminate.
- the second layer portion of the buffer layer is formed by laminating the compounds, and then heat-treated at a second heat treatment temperature.
- a stacked body to be a pre-buffer layer is formed at a temperature lower than the formation temperature of the light emitting region.
- This preceding buffer layer is a first layer portion constituting the buffer layer.
- a heat treatment is performed on the preceding buffer layer at a first heat treatment temperature.
- an In-based compound or a Zn-based compound is laminated on the pre-buffer layer subjected to the heat treatment at the first heat treatment temperature to form a second layer portion of the buffer layer.
- the second layer portion is made of the same constituent material as the first layer portion, and its formation temperature is lower than the formation temperature of the light emitting region.
- the second layer portion formed in this way has a better crystal matching with the first layer portion serving as the underlayer than the crystal matching between the first layer portion and the substrate. Compared with the single layer portion, the generation of dislocations and crystal defects is more suppressed and the crystallinity is excellent. Then, after forming the second layer portion, a heat treatment is performed at a second heat treatment temperature to form a buffer layer. As a result, the buffer layer can have higher crystallinity.
- the formation temperature of the light-emitting region is set at 300 ° C. or more and 100 ° C. or less. .
- the light emitting region must have high orientation and excellent crystallinity, but if the formation temperature is less than 300 ° C., the crystallinity of the buffer layer is sufficiently secured.
- crystallization energy for sufficiently improving the orientation cannot be provided as heat energy. In that sense, the higher the forming temperature, the better, but setting the temperature too high leads to high manufacturing costs, and depending on the constituent materials, the amount of evaporation may increase. It is desirable to keep it at 100 ° C. these From the content, it is preferable that the formation temperature of the light-emitting region be set to 300 ° C. or more and 100 ° C. or less.
- the Z11-based semiconductor light-emitting device of the present invention comprises: a buffer layer made of an In-based compound or a Zn-based compound which is not formed on the substrate and laminated on the main surface of the substrate; And at least a light-emitting region comprising: a buffer layer formed by subjecting a polycrystalline layer or an amorphous layer to a crystallization treatment.
- the buffer layer in the Z ⁇ -based semiconductor light emitting device of the present invention is obtained by subjecting a polycrystalline layer or an amorphous layer to a crystallization treatment.
- the polycrystalline layer or the amorphous layer to be subjected to the crystallization treatment corresponds to the above-mentioned pre-buffer layer
- the crystallization treatment corresponds to the above-described heat treatment for recrystallization. Is what you do.
- the quality of the buffer layer can be easily and effectively increased as described above.
- FIG. 1 is a schematic cross-sectional view of a main part according to an embodiment of a ⁇ -based semiconductor light emitting device of the present invention.
- FIG. 2 is a schematic sectional view showing an embodiment of the ⁇ 11-based semiconductor light emitting device of the present invention.
- FIG. 3D is a schematic process diagram showing a first example of a manufacturing process of a buffer layer in the Zn-based semiconductor photodetector of the present invention.
- FIG. 3B is a schematic process view showing a second example of the manufacturing process of the buffer layer in the Zn-based semiconductor light-emitting device of the present invention.
- FIG. 3C is a schematic process view showing a third example of the manufacturing process of the buffer layer in the Z 1 -based semiconductor light emitting device of the present invention.
- FIG. 4A is a schematic process diagram showing a fourth example of the manufacturing process of the buffer layer in the Zn-based semiconductor light-emitting device of the present invention.
- FIG. 4B is a schematic process diagram showing a fifth example of the manufacturing process of the buffer layer in the Zn-based semiconductor light emitting device of the present invention.
- FIG. 4C is a schematic process diagram showing a sixth example of the manufacturing process of the buffer layer in the Zn-based semiconductor optical device of the present invention.
- FIG. 1 schematically shows a laminated structure of a main part of a light-emitting element for explaining an embodiment of the present invention.
- a buffer layer 2 made of ZnO is formed on a main surface of a sapphire substrate 1.
- Mgl - a Z n a O (0 ⁇ a ⁇ 1) consisting of (hereinafter, Mg Z nO also referred to) n-type Mg Z Itashita layer 3, Z ⁇ based active layer 4 made of a compound, more p-type Mg
- Mg Z nO also referred to
- Z ⁇ based active layer 4 made of a compound, more p-type Mg
- the constituent material of the active layer 4 is, for example, ZnO, a material obtained by substituting a part of the Zn site with Mg and a part of the Zn site by S , Se, Te, etc. are appropriately selected.
- the buffer layer 2 is formed by laminating a pre-stage buffer layer that is a polycrystalline layer or an amorphous layer, and then performing a crystallization process by a heat treatment before forming the light emitting layer portion 10.
- a pre-stage buffer layer that is a polycrystalline layer or an amorphous layer
- the buffer layer can be easily formed.
- MBE Metal Organic Vapor Phase Epitaxy
- MOM BE Metal Organic Molecular Beam Epitaxy
- Gas source with solid metal element source and non-metal element source as gas MBE Chemical beam epitaxy with metal element source as organic metal and non-metal element source as gas (CBE (Chemical Beam Epitaxy)) is included as a concept.
- CBE Chemical Beam Epitaxy
- a sputtering method or a sputtering method using DC magnets may be used.
- the buffer layer is made of, for example, ITO other than a Z11-based compound such as Z ⁇
- the sputtering method is used. It is good to form.
- the formation method of the pre-stage buffer layer is determined by a known chemical vapor deposition method, taking into account the required formation temperature and formation time. Or a physical vapor deposition method.
- the first important point is that the pre-buffer layer is formed as a layer with lower crystal continuity and periodicity than a single crystal layer such as an amorphous layer or a polycrystalline layer.
- the formation conditions of the former buffer layer are preferably set at least at a temperature of 400 ° C. or lower.
- the temperature should be in the range from room temperature to about 350 ° C, and if it should be formed as a polycrystalline layer, it should be in the range from about 350 ° C to 400 ° C.
- the formation temperature is set appropriately.
- the pre-buffer layer is subjected to a heat treatment for crystallization. Will be. Since this heat treatment is performed to increase the orientation by recrystallization, it is particularly desirable to set the temperature to a higher temperature. For example, the temperature is set at least higher than the formation temperature of the former buffer layer.
- the treatment time can be shortened.
- the heat treatment temperature is 110 ° C.
- the heat treatment is performed for about 30 seconds
- the heat treatment temperature is 800 ° C.
- the heat treatment is performed for about 10 minutes.
- the heat treatment temperature is appropriately set in the range of 300 to 110 ° C
- the heat treatment time is appropriately set in the range of 30 seconds to 30 minutes.
- the heat treatment atmosphere for such a heat treatment applied to the preceding buffer layer is, in particular, an oxygen-containing atmosphere.
- Oxidizing atmosphere For example, by using nitrous oxide or oxygen as an oxidizing gas to create an oxidizing atmosphere, a buffer layer in which oxygen vacancies are effectively suppressed can be formed.
- the buffer layer 2 in FIG. 1 is formed by performing the above-described heat treatment on the preceding buffer layer. After that, the light emitting layer portion 10 is formed at a forming temperature of about 300 to 800 ° C. by, for example, a MOVPE apparatus.
- the 11-type MgZnO layer 2 in FIG. 1 contains one or more of B, A1, Ga, and In as an n-type dopant.
- the group II elements B, Al, Ga, and In can replace the group II elements Mg and Zn elements and dope n-type carriers. In consideration of the crystallinity of the n-type MgZn ⁇ layer 2, it is preferable to select Ga close to the ionic radius of the Zn element as the n-type dopant.
- the ⁇ -type MgZnO layer 5 contains one or more of Li, N.a, Cu, N, P, As, Al, Ga, and In as the ⁇ -type dopant.
- Group I elements L i and Na replace the group II elements Mg and Zn sites, and group V elements N, P and As replace the group VI O sites to form p.
- Doping type carriers It is possible to Since CuO is a non-doped! Type semiconductor, by doping Cu to generate CuO, Cu functions as a p-type dopant. Also, by adding Al, Ga, In, and Li together with N, good p-type characteristics can be obtained more reliably. Further, taking into account the crystallinity of the p-type MgZ ⁇ layer 5, N having an ionic radius close to the element Zn or O, and one or more of Ga, A1 and In, particularly Ga, are used. It is preferred to choose.
- the pre-buffer layer serving as the buffer layer 2 in FIG. 1 and other layers are formed by a vapor phase growth apparatus, the following main materials can be used for the respective layers.
- Oxygen component source gas a power that can use oxygen gas
- Specific examples include N 2 0, NO, N0 2 , CO.
- N 20 nitrous oxide
- Mg source (metal component source) gas bis cyclopentadienyl magnesium (C p 2 M g) and the like.
- the p-type dopant one or more of Al, Ga and In can be made to function better as a type dopant by co-addition with N.
- the following can be used as the dopant gas.
- TMA1 trimethylaluminum
- EMA1 triethylaluminum
- TAG Trimethylgallium
- TMGa Triethylgallium
- TMGa triethylgallium
- TMI n Trimethyl indium
- TE In triethyl indium
- a gas serving as an N source (for example, NH 3 or the like) is used as a Ga source when performing vapor phase growth of a p-type MgZ ⁇ layer.
- an organic metal gas for example, N 20 used as an oxygen component source may be configured to function also as an N source.
- An n-type carrier can be doped by adding one or more of Al, Ga and In as an n-type dopant.
- the dopant gas the same gas as described above can be used.
- n-type MgZiiO layer 3 in Fig. 1 oxygen deficiency is very likely to occur during vapor phase growth in a vacuum atmosphere, and the conductivity type tends to be n-type inevitably. Therefore, in growing the n-type MgZiiO layer 3 in Fig. 1, it is also possible to adopt a method in which oxygen vacancies are positively generated to make the active layer 4 and the p-type MgZ ⁇ layer 5 It is effective to lower the oxygen-containing atmosphere pressure (for example, to less than 1 ⁇ 10 3 Pa) than in the case of growing. At the same time, it is possible to positively drive the n-type carrier by growing the layer while simultaneously introducing the n-type dopant. Alternatively, the ratio between feed group II and group VI (feed I IZV I ratio) may be increased.
- the growth is performed in an oxygen-containing atmosphere having a pressure of 1 ⁇ 10 3 Pa or more, so that oxygen deficiency during film formation is reduced.
- the active layer 4 having good characteristics, a p-type MgZnO layer 5 can be obtained.
- the oxygen partial pressure oxygen-containing molecules other than 0 2 are also intended to incorporate by converting the oxygen contained in 0 2 is preferably set to 1 X 10 3 P a or more.
- the p-type MgZnO layer Oxygen deficiency can be further suppressed by intermittently interrupting the flow rate of the gas used as the main raw material and promoting oxidation.
- the formation of the light emitting layer portion 10 is completed as described above, a part of the active layer 4 and a part of the p-type MgZnO layer 5 are partially removed by photolithography or the like as shown in FIG. While the transparent electrode 23 made of ITO or the like is formed, the metal electrode 22 is formed on the remaining p-type MgZ ⁇ layer 5, and then the dicing is performed with the sapphire substrate 1. A light-emitting element 100 is obtained. In this case, light is extracted mainly from the transparent sapphire substrate 1 side.
- the light-emitting layer may be of a single-hetero type in which the light-emitting layer portion is a double-head type, and in FIG. From the board side! ) A mold layer and an 11-type layer may be formed in this order.
- the gist of the present invention relates to the formation form of the buffer layer. Therefore, the manufacturing process of the buffer layer and its form will be described together with various embodiments.
- 3A to 3C show a manufacturing process of the buffer layer. As shown in FIGS. 3A to 3C, a pre-buffer layer 2 'made of an In-based compound or a Zn-based compound is formed on the main surface of the substrate 1, and then the pre-buffer layer 2' is formed again. A heat treatment for crystallization is performed to form the buffer layer 2. The method of forming the pre-buffer layer and the heat treatment conditions can be performed in the same manner as described above. FIG.
- the pre-buffer layer 2 ′ is formed as a polycrystalline layer or an amorphous layer.
- the substrate 1 sapphire substrate or the like is used.
- the substrate 1 may be a single crystal substrate such as a sapphire substrate, so that the pre-buffer layer 2 ′ can be easily crystallized when heat-treated and recrystallized.
- FIGS. 3B and 3C correspond to the case where the substrate 1 is formed as a single crystal substrate and the pre-stage buffer layer 2 ′ is formed as a polycrystalline layer.
- the pre-buffer layer 2 ′ has columnar crystal grains from the main surface of the substrate 1 to the outermost surface of the substrate 1 arranged densely on the main surface of the substrate 1.
- the distribution of the main raw material of the constituent material is set so that the entire area within the layer plane is not covered in a specific section in the layer thickness direction. (For example, the gas flow rate in the case of the vapor phase growth method) may be appropriately adjusted.
- a buffer layer 2 with reduced dislocations and crystal defects can be obtained.
- the A-side surface of the sapphire substrate is used as the main surface, and the pre-buffer is formed on the main surface.
- the process of forming the buffer layer can be performed by the following method. Examples are shown in FIGS. 4A to 4C.
- the buffer layer 2 in FIGS. 4A to 4C is also formed by forming a pre-stage buffer layer 2 ′ on the main surface of the substrate 1 and performing a heat treatment for recrystallization on the pre-stage buffer layer 2 ′. It is formed.
- the formation temperature of the pre-buffer layer 2 ′ in FIGS. 4A to 4C is lower than the formation temperature of the light-emitting layer portion, which is a light-emitting region. At least low temperature.
- the formation and temperature of the light emitting layer portion are in the range of, for example, about 300 to 100 ° C.
- This temperature range is a range set in consideration of constituent materials and the like in order to make the crystalline state of the light emitting layer portion closer to a single crystal (including a single crystal). Therefore, by forming the pre-buffer layer 2 ′ at least at a lower temperature than the formation temperature of the light-emitting layer portion, the pre-buffer layer 2 ′ has a lower orientation than a single crystal layer, such as amorphous or polycrystalline or two-phase. May be included.
- a high-quality buffer layer 2 is formed by performing a heat treatment on the pre-buffer layer 2 ′ at a heat treatment temperature set higher than the formation temperature of the light emitting layer. Can be.
- FIG. 4A a high-quality buffer layer 2 is formed by performing a heat treatment on the pre-buffer layer 2 ′ at a heat treatment temperature set higher than the formation temperature of the light emitting layer. Can be.
- FIG. 4A a high-quality buffer layer 2 is formed by performing a heat treatment on the pre-buffer layer 2 ′
- the first-stage heat treatment is performed on the first buffer layer 2 at a first heat treatment temperature located between the formation temperature of the light-emitting layer portion and the formation temperature of the first buffer layer 2 ′.
- a second-stage heat treatment is performed at a second heat treatment temperature higher than the formation temperature of the light-emitting layer portion, thereby forming the high-quality buffer layer 2.
- FIG. 4C between the first-stage heat treatment and the second-stage heat treatment in FIG. 4B, a second-layer portion 2 ′′ made of the same material as the former buffer layer 2 ′ is formed.
- the pre-buffer layer 2 ′ is formed as a first layer portion 2 ′ and further laminated thereon.
- the formation temperature of the second layer portion 2 ′ is also lower than the formation temperature of the light emitting layer portion.
- the buffer layer 2 in FIG. 4C includes the first layer portion 2 ′ and the second layer portion 2 ′′, and can have higher quality than the buffer layer 2 in FIG. 4B.
- FIG. 4A to FIG. 4C by defining the magnitude relation among the three of the formation temperature of the pre-buffer layer, the temperature of the heat treatment applied to the pre-buffer layer, and the formation temperature of the light emitting layer, Effectively, the quality of the buffer layer can be easily increased.
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Abstract
Description
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EP03770015A EP1557889A1 (en) | 2002-10-31 | 2003-10-30 | Zn SEMICONDUCTOR LIGHT-EMITTING DEVICE AND METHOD FOR MANUFACTURING SAME |
US10/500,703 US7157307B2 (en) | 2002-10-31 | 2003-10-30 | Zn-base semiconductor light-emitting device and method for manufacturing same |
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JP2002317354A JP3859148B2 (ja) | 2002-10-31 | 2002-10-31 | Zn系半導体発光素子の製造方法 |
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KR100568299B1 (ko) * | 2004-03-31 | 2006-04-05 | 삼성전기주식회사 | 질화갈륨계 반도체 발광소자 |
US7381631B2 (en) * | 2005-07-05 | 2008-06-03 | Hewlett-Packard Development Company, L.P. | Use of expanding material oxides for nano-fabrication |
JP2007056164A (ja) * | 2005-08-25 | 2007-03-08 | Univ Nagoya | 発光層形成用基材、発光体及び発光物質 |
KR100674888B1 (ko) * | 2005-08-25 | 2007-01-29 | 에피밸리 주식회사 | 반도체 발광소자 |
JP2008177523A (ja) * | 2006-12-20 | 2008-07-31 | Showa Denko Kk | Iii族窒化物化合物半導体発光素子の製造方法、及びiii族窒化物化合物半導体発光素子、並びにランプ |
US7606448B2 (en) * | 2007-03-13 | 2009-10-20 | Micron Technology, Inc. | Zinc oxide diodes for optical interconnections |
FR2917537B1 (fr) | 2007-06-15 | 2009-09-25 | Saft Groupe Sa | Accumulateur lithium-ion contenant un electrolyte comprenant un liquide ionique |
FR2918791B1 (fr) * | 2007-07-13 | 2009-12-04 | Saint Gobain | Substrat pour la croissance epitaxiale de nitrure de gallium |
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- 2003-10-30 KR KR1020047011407A patent/KR20050074274A/ko not_active Application Discontinuation
- 2003-10-30 WO PCT/JP2003/013910 patent/WO2004040662A1/ja active Application Filing
- 2003-10-30 CN CN2003801001514A patent/CN100407450C/zh not_active Expired - Fee Related
- 2003-10-30 US US10/500,703 patent/US7157307B2/en not_active Expired - Fee Related
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Also Published As
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KR20050074274A (ko) | 2005-07-18 |
TW200414570A (en) | 2004-08-01 |
JP3859148B2 (ja) | 2006-12-20 |
US20050017261A1 (en) | 2005-01-27 |
JP2004153062A (ja) | 2004-05-27 |
US7157307B2 (en) | 2007-01-02 |
CN1685532A (zh) | 2005-10-19 |
EP1557889A1 (en) | 2005-07-27 |
CN100407450C (zh) | 2008-07-30 |
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