JP7415913B2 - 半導体装置及びその製造方法 - Google Patents
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Description
Claims (13)
- 表面と、前記表面の反対側の裏面と、前記表面と前記裏面との間の第1導電型のドリフト層とを有する半導体基板と、
前記ドリフト層と前記表面との間に設けられた第2導電型の第1拡散層と、
前記ドリフト層と前記裏面との間に設けられた第2拡散層と、
前記ドリフト層と前記第2拡散層との間に設けられ、プロトンが注入され、前記ドリフト層よりも高濃度である第1導電型の第1バッファ層と、
前記第1バッファ層と前記第2拡散層との間に、前記ドリフト層よりも高濃度である第1導電型の第2バッファ層とを備え、
前記第2バッファ層のピーク濃度は前記第1バッファ層のピーク濃度よりも高く、
前記第1バッファ層の不純物濃度は前記裏面に向かって徐々に減少し、
前記第1バッファ層のピーク位置から前記ドリフト層と前記第1バッファ層の境界までの長さをXaとし、
前記ピーク位置から前記第1バッファ層と前記第2バッファ層の境界までの長さをXbとし、
Xb>5Xaであることを特徴とする半導体装置。 - 前記第2拡散層はp型層を有し、
前記第1バッファ層の前記ピーク位置は前記裏面から深さ10~30umの範囲内に存在することを特徴とする請求項1の半導体装置。 - 前記第2拡散層はp型層を有し、
前記第1バッファ層の前記ピーク濃度は1E15cm-3以下であることを特徴とする請求項1又は2の半導体装置。 - 前記表面から前記裏面に向かってドナー不純物濃度を積分した場合に、前記ドリフト層及び前記第1バッファ層は臨界積分濃度以下であり、前記第2バッファ層は少なくともピーク濃度の位置で臨界積分濃度以上となることを特徴とする請求項1~3の何れか1項に記載の半導体装置。
- 前記第2バッファ層の不純物濃度は2E16cm-3以上であることを特徴とする請求項1~4の何れか1項に記載の半導体装置。
- 前記第2バッファ層の前記ピーク濃度の前記裏面からの深さは2μm以下であることを特徴とする請求項1~5の何れか1項に記載の半導体装置。
- 前記第1バッファ層及び前記第2バッファ層の不純物濃度の極小値が前記ドリフト層の不純物濃度以上であることを特徴とする請求項1~6の何れか1項に記載の半導体装置。
- 前記第1バッファ層の前記ピーク位置から前記裏面に向かって0.3Xbまでのドナー濃度が前記第1バッファ層のピーク濃度の10%以上であることを特徴とする請求項1~7の何れか1項に記載の半導体装置。
- 前記ドリフト層の不純物濃度が3E13~3E14cm-3の範囲であり、
前記第1バッファ層の前記ピーク位置が15~25μmに存在することを特徴とする請求項1~8の何れか1項に記載の半導体装置。 - 前記ドリフト層の不純物濃度が1E12~3E13cm-3の範囲であり、
前記第1バッファ層の前記ピーク位置が20~30μmに存在することを特徴とする請求項1~8の何れか1項に記載の半導体装置。 - 請求項1~10の何れか1項に記載の半導体装置を製造する方法であって、
前記半導体基板の前記裏面に不純物を注入して前記第2拡散層を形成する工程と、
前記ドリフト層と前記第2拡散層との間にプロトンを注入して前記第1バッファ層を形成する工程と、
前記第1バッファ層と前記第2拡散層との間に不純物を注入して前記第2バッファ層を形成する工程と、
レーザーの熱を用いて前記第2拡散層及び前記第2バッファ層を活性化する工程と、
ファーネスアニールにより前記第1バッファ層をドナー化する工程とを備え、
前記ファーネスアニールの温度が400~450℃の範囲であり、処理時間が2時間以上であることを特徴とする半導体装置の製造方法。 - 請求項1~10の何れか1項に記載の半導体装置を製造する方法であって、
前記半導体基板の前記裏面に不純物を注入して前記第2拡散層を形成する工程と、
前記ドリフト層と前記第2拡散層との間にプロトンを注入して前記第1バッファ層を形成する工程と、
前記第1バッファ層と前記第2拡散層との間に不純物を注入して前記第2バッファ層を形成する工程と、
レーザーの熱を用いて前記第2拡散層及び前記第2バッファ層を活性化する工程と、
ファーネスアニールにより前記第1バッファ層をドナー化する工程とを備え、
前記ファーネスアニールの温度が410~450℃の範囲であり、処理時間が1時間以上であることを特徴とする半導体装置の製造方法。 - 前記半導体基板の不純物濃度が3E13~3E14cm-3の場合には前記プロトンの飛程を15~25umとし、前記半導体基板の不純物濃度が1E12~3E13cm-3の場合には前記プロトンの飛程を20~30umとすることを特徴とする請求項11又は12に記載の半導体装置の製造方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2020218320A JP7415913B2 (ja) | 2020-12-28 | 2020-12-28 | 半導体装置及びその製造方法 |
US17/350,051 US11574998B2 (en) | 2020-12-28 | 2021-06-17 | Semiconductor device and manufacturing method thereof |
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JP2008227414A (ja) | 2007-03-15 | 2008-09-25 | Fuji Electric Device Technology Co Ltd | 半導体装置およびその製造方法 |
JP2009176892A (ja) | 2008-01-23 | 2009-08-06 | Fuji Electric Device Technology Co Ltd | 半導体装置およびその製造方法 |
WO2014065080A1 (ja) | 2012-10-23 | 2014-05-01 | 富士電機株式会社 | 半導体装置およびその製造方法 |
JP2019009148A (ja) | 2017-06-20 | 2019-01-17 | 三菱電機株式会社 | 半導体装置およびその製造方法 |
US20190165151A1 (en) | 2017-11-29 | 2019-05-30 | Infineon Technologies Ag | Insulated Gate Bipolar Transistor Having First and Second Field Stop Zone Portions and Manufacturing Method |
JP2019096897A (ja) | 2015-06-17 | 2019-06-20 | 富士電機株式会社 | 半導体装置 |
JP2020027921A (ja) | 2018-08-17 | 2020-02-20 | 三菱電機株式会社 | 半導体装置およびその製造方法 |
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JP2008227414A (ja) | 2007-03-15 | 2008-09-25 | Fuji Electric Device Technology Co Ltd | 半導体装置およびその製造方法 |
JP2009176892A (ja) | 2008-01-23 | 2009-08-06 | Fuji Electric Device Technology Co Ltd | 半導体装置およびその製造方法 |
WO2014065080A1 (ja) | 2012-10-23 | 2014-05-01 | 富士電機株式会社 | 半導体装置およびその製造方法 |
JP2019096897A (ja) | 2015-06-17 | 2019-06-20 | 富士電機株式会社 | 半導体装置 |
JP2019009148A (ja) | 2017-06-20 | 2019-01-17 | 三菱電機株式会社 | 半導体装置およびその製造方法 |
US20190165151A1 (en) | 2017-11-29 | 2019-05-30 | Infineon Technologies Ag | Insulated Gate Bipolar Transistor Having First and Second Field Stop Zone Portions and Manufacturing Method |
JP2020027921A (ja) | 2018-08-17 | 2020-02-20 | 三菱電機株式会社 | 半導体装置およびその製造方法 |
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