JPWO2020129186A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 69
- 239000000758 substrate Substances 0.000 claims abstract description 109
- 238000009792 diffusion process Methods 0.000 claims description 106
- 230000004888 barrier function Effects 0.000 claims description 35
- 239000012535 impurity Substances 0.000 claims description 35
- 239000002184 metal Substances 0.000 claims description 35
- 229910000789 Aluminium-silicon alloy Inorganic materials 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 5
- 229910005883 NiSi Inorganic materials 0.000 claims description 4
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- 238000010586 diagram Methods 0.000 description 4
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- 230000000052 comparative effect Effects 0.000 description 2
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- 230000001939 inductive effect Effects 0.000 description 2
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- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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Abstract
Description
図1は、実施の形態1に係る半導体装置100の断面図である。半導体装置100は還流ダイオードを内蔵した絶縁ゲート型バイポーラトランジスタである。半導体装置100は、基板10と、基板10の上面に設けられた第1電極20と、基板10の上面と反対側の面である裏面に設けられた第2電極30とを備える。基板10は、IGBT領域40と、ダイオード領域60と、IGBT領域40とダイオード領域60との間の高抵抗領域50とを有する。
図10は、実施の形態2に係る半導体装置500の断面図である。本実施の形態では、高抵抗領域50の構造が実施の形態1と異なる。半導体装置500にはn型拡散層57は形成されない。基板10の裏面側において、n+カソード層67はダイオード領域60と高抵抗領域50に設けられる。
図11は、実施の形態3に係る半導体装置600の断面図である。半導体装置600では、基板10に裏面側の構造および第2電極630の構造が実施の形態1と異なる。ダイオード領域60では、基板10は裏面側にn+カソード層667を有する。高抵抗領域50では、基板10は裏面側にn型拡散層657を有する。n型拡散層657は、n+カソード層667と不純物濃度および厚さが等しい。
図12は、実施の形態4に係る半導体装置700の断面図である。半導体装置700では、基板10の上面側の構造と第1電極720の構造が実施の形態2と異なる。IGBT領域40では、基板10は上面側にpベース拡散層42を有する。ダイオード領域60では、基板10は上面側にpアノード拡散層762を有する。高抵抗領域50では、基板10は上面側にp型拡散層752を有する。pアノード拡散層762とp型拡散層752の不純物濃度は、pベース拡散層42よりも低い。
図11は、実施の形態3に係る半導体装置600の断面図である。半導体装置600では、基板10の裏面側の構造および第2電極630の構造が実施の形態1と異なる。ダイオード領域60では、基板10は裏面側にn+カソード層667を有する。高抵抗領域50では、基板10は裏面側にn型拡散層657を有する。n型拡散層657は、n+カソード層667と不純物濃度および厚さが等しい。
Claims (10)
- IGBT領域と、ダイオード領域と、前記IGBT領域と前記ダイオード領域との間の高抵抗領域と、を有する基板と、
前記基板の上面に設けられた第1電極と、
前記基板の上面と反対側の面である裏面に設けられた第2電極と、
を備え、
前記高抵抗領域は、前記基板の上面と前記第1電極との間のコンタクト抵抗または前記基板の裏面と前記第2電極との間のコンタクト抵抗が、前記ダイオード領域よりも大きく、
前記高抵抗領域の幅は前記基板の厚さ以上であることを特徴とする半導体装置。 - 前記ダイオード領域では、前記基板は裏面側にカソード層を有し、
前記高抵抗領域では、前記基板は裏面側にn型拡散層を有し、
前記n型拡散層の不純物濃度は、前記カソード層よりも低く、
前記n型拡散層と前記第2電極との間のコンタクト抵抗は、前記カソード層と前記第2電極との間のコンタクト抵抗よりも大きいことを特徴とする請求項1に記載の半導体装置。 - 前記ダイオード領域では、前記基板は裏面側にカソード層を有し、
前記高抵抗領域では、前記基板は裏面側に前記カソード層と不純物濃度が等しいn型拡散層を有し、
前記第2電極のうち前記カソード層と接触する部分と、前記n型拡散層と接触する部分は異なる材質で形成され、
前記n型拡散層と前記第2電極との間のコンタクト抵抗は、前記カソード層と前記第2電極との間のコンタクト抵抗よりも大きいことを特徴とする請求項1に記載の半導体装置。 - 前記第2電極のうち前記カソード層と接触する部分はNiSiから形成され、
前記第2電極のうち前記n型拡散層と接触する部分はAlSiから形成されることを特徴とする請求項3に記載の半導体装置。 - 前記第1電極は、前記IGBT領域、前記ダイオード領域および前記高抵抗領域で、前記基板の上面と接するバリアメタルを有し、
前記基板のうち前記バリアメタルと接する部分の不純物濃度は、前記IGBT領域および前記ダイオード領域よりも前記高抵抗領域で低く、
前記高抵抗領域では、前記基板と前記バリアメタルとの間のコンタクト抵抗が、前記ダイオード領域よりも大きいことを特徴とする請求項1から4の何れか1項に記載の半導体装置。 - 前記IGBT領域では、前記基板は上面側にベース層を有し、
前記ダイオード領域では、前記基板は上面側にアノード層を有し、
前記高抵抗領域では、前記基板は上面側にp型拡散層を有し、
前記ベース層と前記アノード層と前記p型拡散層は、不純物濃度が等しく、
前記基板は、前記ベース層と前記バリアメタルの間と、前記アノード層と前記バリアメタルの間に、前記アノード層よりも不純物濃度が高く、前記バリアメタルと接触するコンタクト層を有し、
前記高抵抗領域では、前記バリアメタルと接する部分の不純物濃度は前記コンタクト層の不純物濃度よりも低いことを特徴とする請求項5に記載の半導体装置。 - 前記IGBT領域では、前記基板は上面側にベース層を有し、
前記ダイオード領域では、前記基板は上面側にアノード層を有し、
前記高抵抗領域では、前記基板は上面側にp型拡散層を有し、
前記アノード層と前記p型拡散層の不純物濃度は、前記ベース層よりも低く、
前記第1電極は、前記IGBT領域と前記高抵抗領域で前記基板の上面と接するバリアメタルと、前記バリアメタルの上に設けられ前記ダイオード領域で前記基板の上面と接する上部電極を有し、
前記p型拡散層と前記バリアメタルとの間のコンタクト抵抗は、前記アノード層と前記上部電極との間のコンタクト抵抗よりも大きいことを特徴とする請求項1から4の何れか1項に記載の半導体装置。 - 前記ダイオード領域では、前記基板は上面側にアノード層を有し、
前記高抵抗領域では、前記基板は上面側にp型拡散層を有し、
前記アノード層と前記p型拡散層は、不純物濃度と厚さが等しいことを特徴とする請求項1から4に何れか1項に記載の半導体装置。 - IGBT領域と、ダイオード領域と、前記IGBT領域と前記ダイオード領域との間の高抵抗領域と、を有する基板と、
前記基板の上面に設けられた第1電極と、
前記基板の上面と反対側の面である裏面に設けられた第2電極と、
を備え、
前記ダイオード領域では、前記基板は裏面側にカソード層を有し、
前記高抵抗領域では、前記基板は裏面側に前記カソード層と不純物濃度が等しいn型拡散層を有し、
前記第2電極のうち前記カソード層と接触する部分と、前記n型拡散層と接触する部分は異なる材質で形成され、
前記n型拡散層と前記第2電極との間のコンタクト抵抗は、前記カソード層と前記第2電極との間のコンタクト抵抗よりも大きいことを特徴とする半導体装置。 - IGBT領域と、ダイオード領域と、前記IGBT領域と前記ダイオード領域との間の高抵抗領域と、を有する基板と、
前記基板の上面に設けられた第1電極と、
前記基板の上面と反対側の面である裏面に設けられた第2電極と、
を備え、
前記IGBT領域では、前記基板は上面側にベース層を有し、
前記ダイオード領域では、前記基板は上面側にアノード層を有し、
前記高抵抗領域では、前記基板は上面側にp型拡散層を有し、
前記アノード層と前記p型拡散層の不純物濃度は、前記ベース層よりも低く、
前記第1電極は、前記IGBT領域と前記高抵抗領域で前記基板の上面と接するバリアメタルと、前記バリアメタルの上に設けられ前記ダイオード領域で前記基板の上面と接する上部電極を有し、
前記p型拡散層と前記バリアメタルとの間のコンタクト抵抗は、前記アノード層と前記上部電極との間のコンタクト抵抗よりも大きいことを特徴とする半導体装置。
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JP2007288158A (ja) * | 2006-03-22 | 2007-11-01 | Denso Corp | 半導体装置およびその設計方法 |
JP2010263215A (ja) * | 2009-04-29 | 2010-11-18 | Abb Technology Ag | 逆導電半導体デバイス |
WO2011125156A1 (ja) * | 2010-04-02 | 2011-10-13 | トヨタ自動車株式会社 | ダイオード領域とigbt領域を有する半導体基板を備える半導体装置 |
JP2013138069A (ja) * | 2011-12-28 | 2013-07-11 | Denso Corp | 半導体装置 |
JP2014103376A (ja) * | 2012-09-24 | 2014-06-05 | Toshiba Corp | 半導体装置 |
JP2016058654A (ja) * | 2014-09-11 | 2016-04-21 | 株式会社東芝 | 半導体装置 |
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JP5103830B2 (ja) | 2006-08-28 | 2012-12-19 | 三菱電機株式会社 | 絶縁ゲート型半導体装置 |
JP5724887B2 (ja) | 2012-01-16 | 2015-05-27 | トヨタ自動車株式会社 | 半導体装置 |
CN110785852B (zh) * | 2017-12-06 | 2023-10-24 | 富士电机株式会社 | 半导体装置 |
US10566449B2 (en) * | 2018-04-20 | 2020-02-18 | Duet Microelectronics, Inc. | Dual-operation depletion/enhancement mode high electron mobility transistor |
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JP2007288158A (ja) * | 2006-03-22 | 2007-11-01 | Denso Corp | 半導体装置およびその設計方法 |
JP2010263215A (ja) * | 2009-04-29 | 2010-11-18 | Abb Technology Ag | 逆導電半導体デバイス |
WO2011125156A1 (ja) * | 2010-04-02 | 2011-10-13 | トヨタ自動車株式会社 | ダイオード領域とigbt領域を有する半導体基板を備える半導体装置 |
JP2013138069A (ja) * | 2011-12-28 | 2013-07-11 | Denso Corp | 半導体装置 |
JP2014103376A (ja) * | 2012-09-24 | 2014-06-05 | Toshiba Corp | 半導体装置 |
JP2016058654A (ja) * | 2014-09-11 | 2016-04-21 | 株式会社東芝 | 半導体装置 |
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