CN102844474B - 外延碳化硅单晶基板及其制造方法 - Google Patents
外延碳化硅单晶基板及其制造方法 Download PDFInfo
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- CN102844474B CN102844474B CN201180018417.5A CN201180018417A CN102844474B CN 102844474 B CN102844474 B CN 102844474B CN 201180018417 A CN201180018417 A CN 201180018417A CN 102844474 B CN102844474 B CN 102844474B
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- doped layer
- impurity
- silicon carbide
- single crystal
- epitaxial
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- 239000000758 substrate Substances 0.000 title claims abstract description 89
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 50
- 239000013078 crystal Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims description 26
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 238000000407 epitaxy Methods 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 16
- 229910021421 monocrystalline silicon Inorganic materials 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims description 30
- 229910052710 silicon Inorganic materials 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 239000010703 silicon Substances 0.000 claims description 11
- 238000005229 chemical vapour deposition Methods 0.000 claims description 10
- 125000004432 carbon atom Chemical group C* 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 30
- 230000007547 defect Effects 0.000 description 16
- 235000012431 wafers Nutrition 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 125000004429 atom Chemical group 0.000 description 11
- 238000009826 distribution Methods 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 7
- 238000000227 grinding Methods 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 239000002019 doping agent Substances 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000005468 ion implantation Methods 0.000 description 2
- 125000004433 nitrogen atom Chemical group N* 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000006061 abrasive grain Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- ZDHXKXAHOVTTAH-UHFFFAOYSA-N trichlorosilane Chemical compound Cl[SiH](Cl)Cl ZDHXKXAHOVTTAH-UHFFFAOYSA-N 0.000 description 1
- 239000005052 trichlorosilane Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- 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
- H01L21/02433—Crystal orientation
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
- C30B25/18—Epitaxial-layer growth characterised by the substrate
- C30B25/20—Epitaxial-layer growth characterised by the substrate the substrate being of the same materials as the epitaxial layer
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/32—Carbides
- C23C16/325—Silicon carbide
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
- C30B25/18—Epitaxial-layer growth characterised by the substrate
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/36—Carbides
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- H—ELECTRICITY
- 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
- H01L21/02373—Group 14 semiconducting materials
- H01L21/02378—Silicon carbide
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- H—ELECTRICITY
- 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
- H01L21/02436—Intermediate layers between substrates and deposited layers
- H01L21/02439—Materials
- H01L21/02441—Group 14 semiconducting materials
- H01L21/02447—Silicon carbide
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- H—ELECTRICITY
- 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
- H01L21/02436—Intermediate layers between substrates and deposited layers
- H01L21/02494—Structure
- H01L21/02496—Layer structure
- H01L21/02505—Layer structure consisting of more than two layers
- H01L21/02507—Alternating layers, e.g. superlattice
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- H—ELECTRICITY
- 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
- H01L21/02518—Deposited layers
- H01L21/02521—Materials
- H01L21/02524—Group 14 semiconducting materials
- H01L21/02529—Silicon carbide
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- H—ELECTRICITY
- 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
- H01L21/02518—Deposited layers
- H01L21/0257—Doping during depositing
- H01L21/02573—Conductivity type
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- H—ELECTRICITY
- 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
- H01L21/02612—Formation types
- H01L21/02617—Deposition types
- H01L21/0262—Reduction or decomposition of gaseous compounds, e.g. CVD
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- H—ELECTRICITY
- 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
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/20—Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy
Abstract
Description
Claims (4)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010-109105 | 2010-05-11 | ||
JP2010109105A JP4880052B2 (ja) | 2010-05-11 | 2010-05-11 | エピタキシャル炭化珪素単結晶基板及びその製造方法 |
PCT/JP2011/061124 WO2011142470A1 (ja) | 2010-05-11 | 2011-05-10 | エピタキシャル炭化珪素単結晶基板及びその製造方法 |
Publications (2)
Publication Number | Publication Date |
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CN102844474A CN102844474A (zh) | 2012-12-26 |
CN102844474B true CN102844474B (zh) | 2015-11-25 |
Family
ID=44914519
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CN201180018417.5A Active CN102844474B (zh) | 2010-05-11 | 2011-05-10 | 外延碳化硅单晶基板及其制造方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US8901570B2 (zh) |
EP (1) | EP2570522B1 (zh) |
JP (1) | JP4880052B2 (zh) |
KR (1) | KR101430217B1 (zh) |
CN (1) | CN102844474B (zh) |
WO (1) | WO2011142470A1 (zh) |
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KR101926694B1 (ko) * | 2012-05-30 | 2018-12-07 | 엘지이노텍 주식회사 | 탄화규소 에피 웨이퍼 및 이의 제조 방법 |
KR101926678B1 (ko) * | 2012-05-31 | 2018-12-11 | 엘지이노텍 주식회사 | 탄화규소 에피 웨이퍼 및 이의 제조 방법 |
US8860040B2 (en) | 2012-09-11 | 2014-10-14 | Dow Corning Corporation | High voltage power semiconductor devices on SiC |
US9018639B2 (en) | 2012-10-26 | 2015-04-28 | Dow Corning Corporation | Flat SiC semiconductor substrate |
TW201417149A (zh) * | 2012-10-31 | 2014-05-01 | Lg Innotek Co Ltd | 磊晶晶圓 |
US9738991B2 (en) | 2013-02-05 | 2017-08-22 | Dow Corning Corporation | Method for growing a SiC crystal by vapor deposition onto a seed crystal provided on a supporting shelf which permits thermal expansion |
US9797064B2 (en) | 2013-02-05 | 2017-10-24 | Dow Corning Corporation | Method for growing a SiC crystal by vapor deposition onto a seed crystal provided on a support shelf which permits thermal expansion |
US9017804B2 (en) | 2013-02-05 | 2015-04-28 | Dow Corning Corporation | Method to reduce dislocations in SiC crystal growth |
US8940614B2 (en) | 2013-03-15 | 2015-01-27 | Dow Corning Corporation | SiC substrate with SiC epitaxial film |
US20170170279A1 (en) * | 2014-02-27 | 2017-06-15 | Kyocera Corporation | Silicon carbide crystal ingot, silicon carbide wafer, and method for producing silicon carbide crystal ingot and silicon carbide wafer |
JP6289952B2 (ja) | 2014-03-19 | 2018-03-07 | 株式会社東芝 | SiCエピタキシャル基板の製造方法、半導体装置の製造方法 |
JP6306411B2 (ja) * | 2014-04-17 | 2018-04-04 | 株式会社日立国際電気 | 半導体装置の製造方法、基板処理装置およびプログラム |
WO2015170500A1 (ja) * | 2014-05-08 | 2015-11-12 | 三菱電機株式会社 | SiCエピタキシャルウエハおよび炭化珪素半導体装置の製造方法 |
US9279192B2 (en) | 2014-07-29 | 2016-03-08 | Dow Corning Corporation | Method for manufacturing SiC wafer fit for integration with power device manufacturing technology |
KR102203025B1 (ko) * | 2014-08-06 | 2021-01-14 | 엘지이노텍 주식회사 | 탄화규소 에피 웨이퍼 제조 방법 |
JP6708974B2 (ja) * | 2015-05-18 | 2020-06-10 | 住友電気工業株式会社 | 炭化珪素エピタキシャル基板、炭化珪素半導体装置の製造方法および炭化珪素半導体装置 |
US10865501B2 (en) * | 2015-09-11 | 2020-12-15 | Sumitomo Electric Industries, Ltd. | Silicon carbide epitaxial substrate and method of manufacturing silicon carbide semiconductor device |
JP6584253B2 (ja) | 2015-09-16 | 2019-10-02 | ローム株式会社 | SiCエピタキシャルウェハ、SiCエピタキシャルウェハの製造装置、SiCエピタキシャルウェハの製造方法、および半導体装置 |
WO2017061154A1 (ja) * | 2015-10-07 | 2017-04-13 | 住友電気工業株式会社 | 炭化珪素エピタキシャル基板および炭化珪素半導体装置の製造方法 |
US9679763B1 (en) | 2015-11-20 | 2017-06-13 | International Business Machines Corporation | Silicon-on-insulator fin field-effect transistor device formed on a bulk substrate |
US10415154B2 (en) | 2015-12-02 | 2019-09-17 | Mitsubishi Electric Corporation | Silicon carbide epitaxial substrate and silicon carbide semiconductor device |
US9537011B1 (en) | 2015-12-14 | 2017-01-03 | International Business Machines Corporation | Partially dielectric isolated fin-shaped field effect transistor (FinFET) |
US10840334B2 (en) | 2016-06-24 | 2020-11-17 | Cree, Inc. | Gallium nitride high-electron mobility transistors with deep implanted p-type layers in silicon carbide substrates for power switching and radio frequency applications and process for making the same |
US10892356B2 (en) | 2016-06-24 | 2021-01-12 | Cree, Inc. | Group III-nitride high-electron mobility transistors with buried p-type layers and process for making the same |
US10192980B2 (en) * | 2016-06-24 | 2019-01-29 | Cree, Inc. | Gallium nitride high-electron mobility transistors with deep implanted p-type layers in silicon carbide substrates for power switching and radio frequency applications and process for making the same |
US11430882B2 (en) | 2016-06-24 | 2022-08-30 | Wolfspeed, Inc. | Gallium nitride high-electron mobility transistors with p-type layers and process for making the same |
CN107068539B (zh) * | 2016-12-15 | 2019-11-22 | 中国电子科技集团公司第五十五研究所 | 降低碳化硅外延基平面位错密度的方法 |
JP6748572B2 (ja) * | 2016-12-28 | 2020-09-02 | 昭和電工株式会社 | p型SiCエピタキシャルウェハ及びその製造方法 |
US11929428B2 (en) | 2021-05-17 | 2024-03-12 | Wolfspeed, Inc. | Circuits and group III-nitride high-electron mobility transistors with buried p-type layers improving overload recovery and process for implementing the same |
CN117448955B (zh) * | 2023-12-21 | 2024-03-29 | 南京百识电子科技有限公司 | 一种碳化硅外延结构的制备方法 |
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2010
- 2010-05-11 JP JP2010109105A patent/JP4880052B2/ja active Active
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2011
- 2011-05-10 KR KR1020127025335A patent/KR101430217B1/ko active IP Right Grant
- 2011-05-10 WO PCT/JP2011/061124 patent/WO2011142470A1/ja active Application Filing
- 2011-05-10 US US13/697,211 patent/US8901570B2/en active Active
- 2011-05-10 CN CN201180018417.5A patent/CN102844474B/zh active Active
- 2011-05-10 EP EP11780725.5A patent/EP2570522B1/en active Active
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CN1260776C (zh) * | 2001-10-25 | 2006-06-21 | 松下电器产业株式会社 | 半导体衬底、半导体元件及其制造方法 |
CN1643188A (zh) * | 2002-03-19 | 2005-07-20 | 财团法人电力中央研究所 | SiC结晶的制造方法以及SiC结晶 |
CN1324168C (zh) * | 2002-03-19 | 2007-07-04 | 财团法人电力中央研究所 | SiC结晶的制造方法以及SiC结晶 |
CN101599428A (zh) * | 2008-06-04 | 2009-12-09 | 日立电线株式会社 | 碳化硅半导体衬底及其制造方法 |
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EP2570522A1 (en) | 2013-03-20 |
JP4880052B2 (ja) | 2012-02-22 |
KR101430217B1 (ko) | 2014-08-18 |
US8901570B2 (en) | 2014-12-02 |
WO2011142470A1 (ja) | 2011-11-17 |
EP2570522B1 (en) | 2017-01-18 |
US20130049014A1 (en) | 2013-02-28 |
JP2011236085A (ja) | 2011-11-24 |
EP2570522A4 (en) | 2015-04-01 |
CN102844474A (zh) | 2012-12-26 |
KR20120132531A (ko) | 2012-12-05 |
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