JP2021072407A - 半導体装置 - Google Patents
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 380
- 239000012535 impurity Substances 0.000 claims abstract description 55
- 238000000034 method Methods 0.000 description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 230000004048 modification Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 7
- 229910052814 silicon oxide Inorganic materials 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000779 depleting effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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Abstract
Description
図4(a)に示すように、第1半導体層11と第1絶縁膜43との界面に正孔の蓄積層が形成される。また、第1半導体層11と第2絶縁膜53との界面にも正孔が蓄積される。このため、第2半導体層13および第3半導体層14から第1半導体層11への正孔の注入が促進され、第1半導体層11における正孔および電子の密度をさらに高くすることができる。すなわち、半導体装置1のダイオードモードにおける導通損失をより低減することが可能となる。
Claims (9)
- 第1面と、前記第1面とは反対側の第2面と、を有する半導体部と、
前記半導体部の前記第1面上に設けられた第1電極と、
前記半導体部の前記第2面上に設けられた第2電極と、
前記半導体部と前記第1電極との間に設けられた第1制御電極であって、前記半導体部の前記第1面側に設けられた第1トレンチ中に位置し、前記半導体部から第1絶縁膜により電気的に絶縁された第1制御電極と、
前記半導体部と前記第1電極との間に設けられた第2制御電極であって、前記半導体部の前記第1面側に設けられた第2トレンチ中に位置し、前記半導体部から第2絶縁膜により電気的に絶縁された第2制御電極と、
前記半導体部と前記第1電極との間に設けられた第3制御電極であって、前記半導体部の前記第1面側に設けられた第3トレンチ中に位置し、前記半導体部から第3絶縁膜により電気的に絶縁され、前記第1および第2制御電極とは電気的に分離された第3制御電極と、
を備え、
前記半導体部は、第1導電形の第1半導体層と、第2導電形の第2半導体層と、第2導電形の第3半導体層と、第1導電形の第4半導体層と、第2導電形の第5半導体層と、第1導電形の第6半導体層と、を含み、
前記第2半導体層は、前記第1半導体層と前記第1電極との間に選択的に設けられ、前記第1制御電極に前記第1絶縁膜を介して向き合う部分を含み、
前記第3半導体層は、前記第1半導体層と前記第1電極との間に選択的に設けられ、前記第2半導体層の第2導電形不純物よりも高濃度の第2導電形不純物を含み、前記第2制御電極に前記第2絶縁膜を介して向き合う部分、および、前記第3制御電極に前記第3絶縁膜を介して向き合う部分を含み、
前記第4半導体層は、前記第2半導体層と前記第1電極との間に選択的に設けられ、前記第1絶縁膜に接する位置に配置され、
前記第5半導体層は、前記第1半導体層と前記第2電極との間に選択的に設けられ、
前記第6半導体層は、前記第1半導体層と前記第2電極との間に選択的に設けられ、前記第1半導体層の前記第1導電形不純物よりも高濃度の第1導電形不純物を含み、
前記第5半導体層および前記第6半導体層は、前記第2電極に沿って交互に配置され、
前記第1電極は、前記第1制御電極から第4絶縁膜により電気的に絶縁され、前記第2制御電極から第5絶縁膜により電気的に絶縁され、前記第2半導体層、前記第3半導体層および前記第4半導体層に電気的に接続され、
前記第2電極は、前記第5半導体層および前記第6半導体層に電気的に接続された半導体装置。 - 前記半導体部は、第2導電形の第7半導体層をさらに含み、
前記第7半導体層は、前記第2半導体層と前記第1電極との間に選択的に設けられ、前記第3半導体層の前記第2導電形不純物よりも高濃度の第2導電形不純物を含み、
前記第4半導体層および前記第7半導体層は、前記第1電極に沿って配置される請求項1記載の半導体装置。 - 前記半導体部は、第1導電形の第8半導体層をさらに含み、
前記第8半導体層は、前記第1半導体層と前記第5半導体層との間に設けられ、前記第1半導体層の第1導電形不純物よりも高濃度の第1導電形不純物を含む請求項1または2に記載の半導体装置。 - 前記半導体部は、第2導電形の第9半導体層をさらに含み、
前記第9半導体層は、前記第3半導体層と前記第1電極との間に選択的に設けられ、前記第3半導体層の前記第2導電形不純物濃度よりも高濃度の第2導電形不純物を含む請求項1〜3のいずれか1つに記載の半導体装置。 - 前記第3制御電極は、複数設けられ、
前記半導体部は、第2導電形の第10半導体層をさらに含み、
前記第10半導体層は、前記複数の第3制御電極のうちの隣合う2つの第3制御電極の間に位置し、前記2つの第3制御電極のそれぞれに第3絶縁膜を介して向き合う部分を含み、前記第2半導体層の前記第2導電形不純物よりも高濃度の第2導電形不純物を含む請求項1〜4のいずれか1つに記載の半導体装置。 - 前記半導体部は、第2導電形の第11半導体層をさらに含み、
前記第11半導体層は、前記第10半導体層と前記第1電極との間に選択的に設けられ、前記第10半導体層の前記第2導電形不純物濃度よりも高濃度の第2導電形不純物を含む請求項5記載の半導体装置。 - 前記第4半導体層は、複数設けられ、
前記複数の第4半導体層の1つは、前記第3半導体層と前記第1電極との間に選択的に設けられ、前記第2絶縁膜に接する位置に配置される請求項1〜6のいずれか1つに記載の半導体装置。 - 前記第2制御電極は、前記第1制御電極に電気的に接続される請求項1〜7のいずれか1つに記載の半導体装置。
- 前記第3制御電極は、前記第1電極に電気的に接続される請求項1〜8のいずれか1つに記載の半導体装置。
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JP2019199659A JP7319601B2 (ja) | 2019-11-01 | 2019-11-01 | 半導体装置 |
US17/015,141 US11296076B2 (en) | 2019-11-01 | 2020-09-09 | Semiconductor device |
CN202010951158.2A CN112786696B (zh) | 2019-11-01 | 2020-09-11 | 半导体装置 |
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JP2019199659A JP7319601B2 (ja) | 2019-11-01 | 2019-11-01 | 半導体装置 |
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