JP6513339B2 - 炭化珪素半導体装置 - Google Patents
炭化珪素半導体装置 Download PDFInfo
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims description 129
- 229910010271 silicon carbide Inorganic materials 0.000 title claims description 128
- 239000004065 semiconductor Substances 0.000 title claims description 126
- 230000002093 peripheral effect Effects 0.000 claims description 146
- 239000012535 impurity Substances 0.000 claims description 66
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 5
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 4
- 238000002513 implantation Methods 0.000 claims description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 230000005684 electric field Effects 0.000 description 74
- 238000006073 displacement reaction Methods 0.000 description 37
- 238000004088 simulation Methods 0.000 description 25
- 238000005530 etching Methods 0.000 description 24
- 239000000758 substrate Substances 0.000 description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 14
- 230000015556 catabolic process Effects 0.000 description 14
- 229910052710 silicon Inorganic materials 0.000 description 14
- 239000010703 silicon Substances 0.000 description 14
- 230000003068 static effect Effects 0.000 description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 239000003550 marker Substances 0.000 description 8
- 230000001681 protective effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 238000005468 ion implantation Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000001039 wet etching Methods 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- 238000000206 photolithography Methods 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- -1 aluminum ions Chemical class 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000001312 dry etching Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
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Description
導体層の表面上に形成された酸化珪素または窒化珪素の厚さ0.5μm〜1.5μmのフィールド絶縁膜と、炭化珪素半導体層の表面上であってフィールド絶縁膜よりも内周側に形成されるとともにフィールド絶縁膜に乗り上げて形成されたショットキー電極と、ショットキー電極を覆いショットキー電極の外周端を越えてフィールド絶縁膜上に延在する表面電極と、炭化珪素半導体層内の上部においてショットキー電極の一部と接して形成され炭化珪素半導体層内において表面電極の外周端よりも外周側に延在し、単位面積当りの不純物量が1.0×1013/cm2〜1.0×1014/cm2の範囲である第二導電型の終端ウェル領域と、終端ウェル領域内に形成され第二導電型の単位面積当りの不純物量が2.0×1014/cm2〜1.0×1015/cm2の範囲である第二導電型の高濃度終端ウェル領域とを備え、終端ウェル領域および高濃度終端ウェル領域は、第二導電型の不純物を100keV〜700keVの注入エネルギーでイオン注入して得られる厚さに形成され、表面電極の外周端は終端ウェル領域の外周端よりも15μm以上内側に存在し、表面電極の外周端は、高濃度終端ウェル領域上に位置し、高濃度終端ウェル領域の外周端よりも2μm以上内側に存在するものである。
まず、本発明の実施の形態1にかかる炭化珪素半導体装置100の構成を説明する。以下、第一導電型をN型とし第二導電型をP型とするN型のSiC−SBD(Silicon Carbide Schottky Barrier Diode)について例示して説明するが、第一導電型をP型とし第二導電型をN型とするP型のSiC−SBDであってもよい。
Claims (6)
- 第一導電型の炭化珪素半導体層と、
前記炭化珪素半導体層の表面上に形成された酸化珪素または窒化珪素の厚さ0.5μm〜1.5μmのフィールド絶縁膜と、
前記炭化珪素半導体層の表面上であって前記フィールド絶縁膜よりも内周側に形成されるとともに、前記フィールド絶縁膜に乗り上げて形成されたショットキー電極と、
前記ショットキー電極を覆い、前記ショットキー電極の外周端を越えて前記フィールド絶縁膜上に延在する表面電極と、
前記炭化珪素半導体層内の上部において前記ショットキー電極の一部と接して形成され、前記炭化珪素半導体層内において前記表面電極の外周端よりも外周側に延在し、単位面積当りの不純物量が1.0×1013/cm2〜1.0×1014/cm2の範囲である第二導電型の終端ウェル領域と、
前記終端ウェル領域内に形成され、第二導電型の単位面積当りの不純物量が2.0×1014/cm2〜1.0×1015/cm2の範囲である第二導電型の高濃度終端ウェル領域とを備え、
前記終端ウェル領域および前記高濃度終端ウェル領域は、第二導電型の不純物を100keV〜700keVの注入エネルギーでイオン注入して得られる厚さに形成され、
前記表面電極の外周端は、前記終端ウェル領域の外周端よりも15μm以上内側に存在し、
前記表面電極の外周端は、前記高濃度終端ウェル領域上に位置し、前記高濃度終端ウェル領域の外周端よりも2μm以上内側に存在する、
ことを特徴とする炭化珪素半導体装置。 - 前記フィールド絶縁膜の厚みは、0.5μm以上である、
ことを特徴とする請求項1記載の炭化珪素半導体装置。 - 前記高濃度終端ウェル領域と前記ショットキー電極の一部とがコンタクトしている、
ことを特徴とする請求項1記載の炭化珪素半導体装置。 - 前記表面電極の外周端部には、テーパー部が設けられた、
ことを特徴とする請求項1ないし3のいずれか1項に記載の炭化珪素半導体装置。 - 前記ショットキー電極は、Ti、Mo、Ni、Auの少なくともいずれか一つの金属を
含む、
ことを特徴とする請求項1ないし4のいずれか1項に記載の炭化珪素半導体装置。 - 前記表面電極は、Al、Cu、Mo、Niの少なくともいずれか一つの金属を含む、
ことを特徴とする請求項1ないし5のいずれか1項に記載の炭化珪素半導体装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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JP2014093251A JP6513339B2 (ja) | 2014-04-30 | 2014-04-30 | 炭化珪素半導体装置 |
KR1020150048136A KR101698357B1 (ko) | 2014-04-30 | 2015-04-06 | 탄화 규소 반도체장치 |
US14/682,970 US9324806B2 (en) | 2014-04-30 | 2015-04-09 | Silicon carbide semiconductor device |
DE102015207981.3A DE102015207981A1 (de) | 2014-04-30 | 2015-04-30 | Siliziumcarbid-Halbleitervorrichtung |
CN201510217654.4A CN105023941B (zh) | 2014-04-30 | 2015-04-30 | 碳化硅半导体装置 |
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JP2014093251A JP6513339B2 (ja) | 2014-04-30 | 2014-04-30 | 炭化珪素半導体装置 |
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JP6513339B2 true JP6513339B2 (ja) | 2019-05-15 |
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JP (1) | JP6513339B2 (ja) |
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JP6649198B2 (ja) * | 2016-07-14 | 2020-02-19 | トヨタ自動車株式会社 | 半導体装置とその製造方法 |
DE112017003754B4 (de) | 2016-07-26 | 2022-10-13 | Mitsubishi Electric Corporation | Halbleitervorrichtung und verfahren zum herstellen einer halbleitervorrichtung |
JP6558385B2 (ja) * | 2017-02-23 | 2019-08-14 | トヨタ自動車株式会社 | 半導体装置の製造方法 |
JP6656475B2 (ja) * | 2017-05-12 | 2020-03-04 | 三菱電機株式会社 | 半導体装置および電力変換装置 |
CN109560142B (zh) * | 2018-10-29 | 2021-11-30 | 厦门市三安集成电路有限公司 | 新型碳化硅结势垒肖特基二极管及其制作方法 |
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