JP6773629B2 - 半導体装置、インバータ回路、駆動装置、車両、昇降機、電源回路、及び、コンピュータ - Google Patents
半導体装置、インバータ回路、駆動装置、車両、昇降機、電源回路、及び、コンピュータ Download PDFInfo
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- JP6773629B2 JP6773629B2 JP2017224449A JP2017224449A JP6773629B2 JP 6773629 B2 JP6773629 B2 JP 6773629B2 JP 2017224449 A JP2017224449 A JP 2017224449A JP 2017224449 A JP2017224449 A JP 2017224449A JP 6773629 B2 JP6773629 B2 JP 6773629B2
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- silicon oxide
- oxide film
- aluminum nitride
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- 239000004065 semiconductor Substances 0.000 title claims description 128
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 201
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 198
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 198
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 160
- 229910052757 nitrogen Inorganic materials 0.000 claims description 101
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 46
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 44
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 28
- 239000001301 oxygen Substances 0.000 claims description 28
- 229910052760 oxygen Inorganic materials 0.000 claims description 28
- 229910052782 aluminium Inorganic materials 0.000 claims description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 22
- 150000004767 nitrides Chemical class 0.000 claims description 19
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims 1
- 239000010410 layer Substances 0.000 description 224
- 239000012535 impurity Substances 0.000 description 44
- 210000000746 body region Anatomy 0.000 description 25
- 230000004888 barrier function Effects 0.000 description 24
- 238000000137 annealing Methods 0.000 description 19
- 230000008859 change Effects 0.000 description 15
- 238000010586 diagram Methods 0.000 description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 14
- 239000007789 gas Substances 0.000 description 13
- 230000001965 increasing effect Effects 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- 229910052733 gallium Inorganic materials 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 229910052710 silicon Inorganic materials 0.000 description 9
- 239000010703 silicon Substances 0.000 description 9
- 239000010936 titanium Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 229910004298 SiO 2 Inorganic materials 0.000 description 7
- 229910052786 argon Inorganic materials 0.000 description 7
- 239000000758 substrate Substances 0.000 description 7
- 229910002601 GaN Inorganic materials 0.000 description 6
- 239000011261 inert gas Substances 0.000 description 6
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 5
- 239000011229 interlayer Substances 0.000 description 5
- 230000005533 two-dimensional electron gas Effects 0.000 description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- RNQKDQAVIXDKAG-UHFFFAOYSA-N aluminum gallium Chemical compound [Al].[Ga] RNQKDQAVIXDKAG-UHFFFAOYSA-N 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 4
- 238000001004 secondary ion mass spectrometry Methods 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 229910052720 vanadium Inorganic materials 0.000 description 4
- 229910017109 AlON Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 238000000231 atomic layer deposition Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005229 chemical vapour deposition Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000005468 ion implantation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- NWAIGJYBQQYSPW-UHFFFAOYSA-N azanylidyneindigane Chemical compound [In]#N NWAIGJYBQQYSPW-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- -1 for example Chemical compound 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- RUFLMLWJRZAWLJ-UHFFFAOYSA-N nickel silicide Chemical compound [Ni]=[Si]=[Ni] RUFLMLWJRZAWLJ-UHFFFAOYSA-N 0.000 description 1
- 229910021334 nickel silicide Inorganic materials 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
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- H01L29/16—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic Table
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
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- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F1/16—Constructional details or arrangements
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- H—ELECTRICITY
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- H01L21/0445—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 comprising crystalline silicon carbide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61C—LOCOMOTIVES; MOTOR RAILCARS
- B61C3/00—Electric locomotives or railcars
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- H01L29/42312—Gate electrodes for field effect devices
- H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
- H01L29/4232—Gate electrodes for field effect devices for field-effect transistors with insulated gate
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- H01L29/7787—Field effect transistors with two-dimensional charge carrier gas channel, e.g. HEMT ; with two-dimensional charge-carrier layer formed at a heterojunction interface with direct single heterostructure, i.e. with wide bandgap layer formed on top of active layer, e.g. direct single heterostructure MIS-like HEMT with wide bandgap charge-carrier supplying layer, e.g. direct single heterostructure MODFET
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Ceramic Engineering (AREA)
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Crystallography & Structural Chemistry (AREA)
- Human Computer Interaction (AREA)
- General Engineering & Computer Science (AREA)
- Insulated Gate Type Field-Effect Transistor (AREA)
- Junction Field-Effect Transistors (AREA)
- Thin Film Transistor (AREA)
- Formation Of Insulating Films (AREA)
Description
第1の実施形態の半導体装置は、ワイドギャップ半導体層と、ゲート電極と、ワイドギャップ半導体層とゲート電極との間に位置し、第1の酸化シリコン膜と、第1の酸化シリコン膜とゲート電極との間の第2の酸化シリコン膜と、第1の酸化シリコン膜と第2の酸化シリコン膜との間の第1の酸窒化アルミニウム膜とを有し、第1の酸窒化アルミニウム膜の中の第1の位置における窒素と酸素の和に対する窒素の第1の原子比が、第1の酸窒化アルミニウム膜の中の第1の位置よりも第2の酸化シリコン膜に近い第2の位置における窒素と酸素の和に対する窒素の第2の原子比よりも小さいゲート絶縁層と、を備える。
第2の実施形態の半導体装置は、ゲート絶縁層は、第3の酸化シリコン膜と、第2の酸化シリコン膜と第3の酸化シリコン膜との間の第2の酸窒化アルミニウム膜を有し、第2の酸窒化アルミニウム膜の中の第3の位置における酸素と窒素の和に対する窒素の第3の原子比が、第2の酸窒化アルミニウム膜の中の第3の位置よりも第3の酸化シリコン膜に近い第4の位置における酸素と窒素の和に対する窒素の第4の原子比よりも小さい以外は、第1の実施形態と同様である。したがって、第1の実施形態と重複する内容については、記述を省略する。
第2の実施形態の変形例の半導体装置は、ワイドギャップ半導体層と、ゲート電極と、ワイドギャップ半導体層とゲート電極との間に位置し、第1の酸化シリコン膜と、第1の酸化シリコン膜とゲート電極との間の第2の酸化シリコン膜と、第1の酸化シリコン膜と第2の酸化シリコン膜との間の酸窒化アルミニウム膜で構成されるユニットが複数積層されたゲート絶縁層と、を備え、酸窒化アルミニウム膜の中の第1の位置における酸素と窒素の和に対する窒素の第1の原子比が、酸窒化アルミニウム膜の中の第1の位置よりも第2の酸化シリコン膜に近い第2の位置における酸素と窒素の和に対する窒素の第2の原子比よりも小さいゲート絶縁層と、を備える。
第3の実施形態の半導体装置は、ゲート絶縁層とゲート電極がトレンチ内に形成される、いわゆるトレンチゲート型の縦型MOSFETである点で、第1の実施形態と異なる。以下、第1の実施形態と重複する内容については一部記述を省略する。
第4の実施形態の半導体装置は、窒化物半導体を用いたHEMTである点で、第1の実施形態と異なる。ゲート絶縁層の基本的な層構造は第2の実施形態の変形例と同様である。以下、第1の実施形態と重複する内容については記述を省略する。
第5の実施形態の半導体装置は、バリア層に形成されたトレンチ(リセス)内にゲート電極が埋め込まれる、いわゆるゲート・リセス構造を備える点で、第4の実施形態と異なっている。したがって、第4の実施形態と重複する内容については記述を省略する。
第6の実施形態の半導体装置は、トレンチの深さが第5の実施形態よりも深い点で、第5の実施形態と異なっている。したがって、第5の実施形態と重複する内容については記述を省略する。
第7の実施形態のインバータ回路及び駆動装置は、第1ないし第3の実施形態の半導体装置を備える駆動装置である。
第8の実施形態の車両は、第1ないし第3の実施形態の半導体装置を備える車両である。
第9の実施形態の車両は、第1ないし第3の実施形態の半導体装置を備える車両である。
第10の実施形態の昇降機は、第1ないし第3の実施形態の半導体装置を備える昇降機である。
第11の実施形態の電源回路及びコンピュータは、第4ないし第6の実施形態のHEMTを有する。
16 ゲート絶縁層
16a 酸化シリコン膜(第1の酸化シリコン膜)
16b 酸化シリコン膜(第2の酸化シリコン膜)
16c 酸窒化アルミニウム膜(第1の酸窒化アルミニウム膜)
16d 酸化シリコン膜(第3の酸化シリコン膜)
16e 酸窒化アルミニウム膜(第2の酸窒化アルミニウム膜)
18 ゲート電極
100 MOSFET(半導体装置)
150 インバータ回路
162 電源回路
200 MOSFET(半導体装置)
300 MOSFET(半導体装置)
400 HEMT(半導体装置)
500 HEMT(半導体装置)
600 HEMT(半導体装置)
700 駆動装置
800 車両
900 車両
1000 昇降機
1100 サーバ(コンピュータ)
C1 第1の位置
C2 第2の位置
C3 第3の位置
C4 第4の位置
Claims (21)
- ワイドギャップ半導体層と、
ゲート電極と、
前記ワイドギャップ半導体層と前記ゲート電極との間に位置し、第1の酸化シリコン膜と、前記第1の酸化シリコン膜と前記ゲート電極との間の第2の酸化シリコン膜と、前記第1の酸化シリコン膜と前記第2の酸化シリコン膜との間の第1の酸窒化アルミニウム膜とを有し、前記第1の酸窒化アルミニウム膜の中の第1の位置における酸素と窒素の和に対する窒素の第1の原子比が、前記第1の酸窒化アルミニウム膜の中の前記第1の位置よりも前記第2の酸化シリコン膜に近い第2の位置における酸素と窒素の和に対する窒素の第2の原子比よりも小さいゲート絶縁層と、
を備える半導体装置。 - 前記第1の原子比は0.13以上0.30以下である請求項1記載の半導体装置。
- 前記第2の原子比は0.70以上0.87以下である請求項1又は請求項2記載の半導体装置。
- 前記第1の酸化シリコン膜と前記第1の酸窒化アルミニウム膜との界面から前記第1の位置までの距離は0.5nm以下であり、前記第2の酸化シリコン膜と前記第1の酸窒化アルミニウム膜との界面から前記第2の位置までの距離は0.5nm以下である請求項1ないし請求項3いずれか一項記載の半導体装置。
- 前記第1の酸窒化アルミニウム膜の膜厚は1nm以上10nm以下である請求項1ないし請求項4いずれか一項記載の半導体装置。
- 前記第1の酸化シリコン膜の膜厚は前記第2の酸化シリコン膜の膜厚よりも厚い請求項1ないし請求項5いずれか一項記載の半導体装置。
- 前記ゲート絶縁層は、第3の酸化シリコン膜と、前記第2の酸化シリコン膜と前記第3の酸化シリコン膜との間の第2の酸窒化アルミニウム膜を有し、
前記第2の酸窒化アルミニウム膜の中の第3の位置における酸素と窒素の和に対する窒素の第3の原子比が、前記第2の酸窒化アルミニウム膜の中の前記第3の位置よりも前記第3の酸化シリコン膜に近い第4の位置における酸素と窒素の和に対する窒素の第4の原子比よりも小さい請求項1ないし請求項6いずれか一項記載の半導体装置。 - 前記ゲート絶縁層の厚さは20nm以上100nm以下である請求項1ないし請求項7いずれか一項記載の半導体装置。
- 前記ワイドギャップ半導体層は炭化珪素を含む請求項1ないし請求項8いずれか一項記載の半導体装置。
- 前記ワイドギャップ半導体層は窒化物半導体を含む請求項1ないし請求項8いずれか一項記載の半導体装置。
- 請求項9記載の半導体装置を備えるインバータ回路。
- 請求項9記載の半導体装置を備える駆動装置。
- 請求項9記載の半導体装置を備える車両。
- 請求項9記載の半導体装置を備える昇降機。
- 請求項10記載の半導体装置を備える電源回路。
- 請求項10記載の半導体装置を備えるコンピュータ。
- ワイドギャップ半導体層と、
ゲート電極と、
前記ワイドギャップ半導体層と前記ゲート電極との間に位置し、第1の酸化シリコン膜と、前記第1の酸化シリコン膜と前記ゲート電極との間の第2の酸化シリコン膜と、前記第1の酸化シリコン膜と前記第2の酸化シリコン膜との間の酸窒化アルミニウム膜で構成されるユニットが複数積層されたゲート絶縁層と、を備え、
前記酸窒化アルミニウム膜の中の第1の位置における酸素と窒素の和に対する窒素の第1の原子比が、前記酸窒化アルミニウム膜の中の前記第1の位置よりも前記第2の酸化シリコン膜に近い第2の位置における酸素と窒素の和に対する窒素の第2の原子比よりも小さいゲート絶縁層と、
を備える半導体装置。 - 前記第1の原子比は0.13以上0.30以下である請求項17記載の半導体装置。
- 前記第2の原子比は0.70以上0.87以下である請求項17又は請求項18記載の半導体装置。
- 前記ワイドギャップ半導体層は炭化珪素を含む請求項17ないし請求項19いずれか一項記載の半導体装置。
- 前記ワイドギャップ半導体層は窒化物半導体を含む請求項17ないし請求項19いずれか一項記載の半導体装置。
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