JP6421570B2 - 半導体装置 - Google Patents
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- JP6421570B2 JP6421570B2 JP2014248139A JP2014248139A JP6421570B2 JP 6421570 B2 JP6421570 B2 JP 6421570B2 JP 2014248139 A JP2014248139 A JP 2014248139A JP 2014248139 A JP2014248139 A JP 2014248139A JP 6421570 B2 JP6421570 B2 JP 6421570B2
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Description
本発明の第1実施形態について説明する。図1に示すように、本実施形態にかかる半導体装置は、基板厚み方向に電流を流す縦型のIGBTとダイオードとが1つの基板に備えられることにより構成されている。具体的には、本実施形態にかかる半導体装置は以下のように構成されている。
本発明の第2実施形態について説明する。本実施形態は、第1実施形態に対してIGBT部100の構成を変更したものであり、その他については第1実施形態と同様であるため、第1実施形態と異なる部分についてのみ説明する。
本発明の第3実施形態について説明する。本実施形態は、第1、第2実施形態に対してホール注入低減層20の形成位置を増加させたものであり、その他については第1、第2実施形態と同様であるため、第1、第2実施形態と異なる部分についてのみ説明する。なお、ここでは第2実施形態に対してホール注入低減層20の形成位置を増加させた場合について説明するが、第1実施形態に対しても同様の構成を適用できる。
本発明の第4実施形態について説明する。本実施形態は、第2、第3実施形態に対してホールストッパ層を備えたものであり、その他については第2、第3実施形態と同様であるため、第2、第3実施形態と異なる部分についてのみ説明する。なお、ここでは第3実施形態に対してホールストッパ層を形成した場合について説明するが、第2実施形態に対しても同様の構成を適用できる。
本発明の第5実施形態について説明する。本実施形態は、第1〜第4実施形態に対してIGBT部100側にはみ出させたホール注入低減層20の形成位置を具体的に特定したものであり、その他については第1〜4実施形態と同様であるため、第1〜第4実施形態と異なる部分についてのみ説明する。なお、ここでは第1実施形態に対してホール注入低減層20の形成位置を増加させた場合について説明するが、第2〜第4実施形態に対しても同様の構成を適用できる。
本発明は上記した実施形態に限定されるものではなく、特許請求の範囲に記載した範囲内において適宜変更が可能である。
3 コレクタ領域
4 カソード領域
5a チャネルp型領域
5b アノード領域
6 トレンチ
7 エミッタ領域
9 ゲート電極
20 ホール注入低減層
30 ホールストッパ層
100 IGBT部
200 ダイオード部
Claims (5)
- 縦型のIGBTが形成されたIGBT部(100)と、前記IGBT部に沿って備えられ、ダイオードが形成されたダイオード部(200)と、を有する半導体装置であって、
第1導電型のドリフト層(1)と、
前記IGBT部において、前記ドリフト層の裏面側に形成された第2導電型のコレクタ領域(3)と、
前記ダイオード部において、前記ドリフト層の裏面側に形成された第1導電型のカソード領域(4)と、
前記ドリフト層の表面側の表層部において、前記IGBT部および前記ダイオード部の双方に形成された第2導電型領域(5)と、
前記IGBT部において、複数本並べられ、前記第2導電型領域よりも深く形成されて前記第2導電型領域を複数に分けることで、前記第2導電型領域の少なくとも一部によってチャネル領域(5a)を構成するトレンチ(6)と、
前記IGBT部において、前記チャネル領域の表層部に前記トレンチの側面に沿って形成された第1導電型のエミッタ領域(7)と、
前記ダイオード部において、前記ドリフト層の上層部に、該ダイオード部における前記第2導電型領域により構成されるアノード領域(5b)よりも深くて低不純物濃度とされ、かつ、前記ドリフト層よりも高不純物濃度とされた第1導電型のホール注入低減層(20)と、
前記トレンチの表面に形成されたゲート絶縁膜(8)と、
前記ゲート絶縁膜の表面に形成されたゲート電極(9)と、
前記IGBT部において前記第2導電型領域に電気的に接続されると共に、前記アノード領域に電気的に接続された上部電極(11)と、
前記IGBT部において前記コレクタ領域に電気的に接続されると共に、前記ダイオード部において前記カソード領域と電気的に接続された下部電極(12)と、を備え、
前記IGBT部のうち前記ダイオード部に隣接している部分にも、前記ホール注入低減層が形成され、
該ホール注入低減層は、前記ダイオード部から前記IGBT部の一部にのみはみ出して形成されていることを特徴とする半導体装置。 - 前記IGBT部には、前記トレンチにて複数に分けられた前記第2導電型領域のうち前記チャネル領域ではない部分によって前記エミッタ領域が形成されていない間引き部が構成されていることを特徴とする請求項1に記載の半導体装置。
- 前記間引き部において、前記トレンチの深さ方向において前記第2導電型領域を上下に分割する第1導電型のホールストッパ層(30)が形成されていることを特徴とする請求項2に記載の半導体装置。
- 前記IGBT部には、前記トレンチにて複数に分けられた前記第2導電型領域のうち前記チャネル領域ではない部分によって前記エミッタ領域が形成されていない間引き部が構成されていると共に、該間引き部において、前記トレンチの深さ方向において前記第2導電型領域を上下に分割する第1導電型のホールストッパ層(30)が形成されており、
前記ホールストッパ層は、前記間引き部のうち前記ホール注入低減層が形成されている部分には形成されておらず、前記ホール注入低減層が形成されていない部分に形成されていることを特徴とする請求項1に記載の半導体装置。 - 前記ホール注入低減層は、前記トレンチの底部よりも浅く形成されていることを特徴とする請求項1ないし4のいずれか1つに記載の半導体装置。
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Application Number | Priority Date | Filing Date | Title |
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JP2014248139A JP6421570B2 (ja) | 2013-12-20 | 2014-12-08 | 半導体装置 |
US15/105,664 US9721945B2 (en) | 2013-12-20 | 2014-12-16 | Semiconductor device with IGBT and diode |
PCT/JP2014/006244 WO2015093038A1 (ja) | 2013-12-20 | 2014-12-16 | 半導体装置 |
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JP2013264294 | 2013-12-20 | ||
JP2013264294 | 2013-12-20 | ||
JP2014248139A JP6421570B2 (ja) | 2013-12-20 | 2014-12-08 | 半導体装置 |
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JP2015135954A JP2015135954A (ja) | 2015-07-27 |
JP2015135954A5 JP2015135954A5 (ja) | 2017-04-13 |
JP6421570B2 true JP6421570B2 (ja) | 2018-11-14 |
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JP6185511B2 (ja) * | 2015-05-26 | 2017-08-23 | トヨタ自動車株式会社 | 半導体装置 |
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