JP2014216410A - 半導体装置 - Google Patents
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- 239000000284 extract Substances 0.000 claims abstract 2
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- 239000000463 material Substances 0.000 claims description 17
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Abstract
【解決手段】 本明細書が開示する半導体装置は、p+型のコンタクト領域38と、n+型のソース領域40と、p−型のベース領域36と、n−型のドリフト領域32と、ゲート電極16と、絶縁体26と、p+型の電界緩和層52と、p型の正孔引抜領域50を備える。電界緩和層52は、不純物濃度がベース領域36の不純物濃度以上であり、ベース領域36の下面に接しており、ゲートトレンチ24と同一、もしくはゲートトレンチよりも深い位置まで形成されている。正孔引抜領域50は、半導体基板11の上面又は第1半導体領域38と接する位置から電界緩和層52に接するまで延びており、アバランシェ降伏時に電界緩和層52内に生じる正孔を半導体基板11の上面に引き抜く。
【選択図】 図1
Description
次に、図6を参照して実施例3の変形例1について説明する。以下では、実施例3と相違する点についてのみ説明し、実施例3と同一の構成についてはその詳細な説明を省略する。
11:半導体基板
16:ゲート電極
24:ゲートトレンチ
26:絶縁体
28:ドレイン電極
30:ドレイン領域
32:ドリフト領域
36:ベース領域
38:コンタクト領域
40:ソース領域
45:キャップ絶縁膜
46:ソース電極
50、54、56、58:正孔引抜領域
52:電界緩和層
53、55:二次元正孔ガス層
Claims (3)
- 第1導電型であり、半導体基板の上面に臨む範囲に配置されている第1半導体領域と、
第2導電型であり、半導体基板の上面に臨む範囲に配置されている第2半導体領域と、
第1導電型であり、第1半導体領域の下面と第2半導体領域の下面に接しているベース領域と、
第2導電型であり、ベース領域の下面に接しており、ベース領域によって第1半導体領域及び第2半導体領域から分離されているドリフト領域と、
ベース領域を貫通してドリフト領域にまで延びるゲートトレンチ内に配置され、第2半導体領域とドリフト領域を分離している範囲のベース領域と対向しているゲート電極と、
ゲート電極とゲートトレンチの内壁との間に配置されている絶縁体と、
第1導電型であり、その第1導電型の不純物濃度がベース領域の第1導電型の不純物濃度以上であり、ベース領域の下面に接しており、ゲートトレンチと同一、もしくはゲートトレンチよりも深い位置まで形成された電界緩和層と、
第1導電型であり、半導体基板の上面又は第1半導体領域と接する位置から電界緩和層に接するまで延びており、アバランシェ降伏時に電界緩和層内に生じるキャリアを半導体基板の上面に引き抜くキャリア引抜領域と、を備えていることを特徴とする半導体装置。 - キャリア引抜領域は、ベース領域とはバンドギャップが異なる材料で形成されており、
キャリア引抜領域とベース領域との接合界面には、キャリアの移動抵抗がベース領域におけるキャリアの移動抵抗よりも小さい二次元キャリアガス層が形成されていることを特徴とする請求項1の半導体装置。 - キャリア引抜領域の第1導電型の不純物濃度は、ベース領域の第1導電型の不純物濃度よりも高いことを特徴とする請求項1の半導体装置。
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JP2013091198A JP6077380B2 (ja) | 2013-04-24 | 2013-04-24 | 半導体装置 |
US14/244,038 US9082815B2 (en) | 2013-04-24 | 2014-04-03 | Semiconductor device having carrier extraction in electric field alleviating layer |
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JP2016115936A (ja) * | 2014-12-11 | 2016-06-23 | インフィネオン テクノロジーズ アーゲーInfineon Technologies Ag | シールドゲートを有する炭化珪素装置を形成する方法 |
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JP2019165206A (ja) * | 2018-03-14 | 2019-09-26 | 富士電機株式会社 | 絶縁ゲート型半導体装置及びその製造方法 |
JP7283107B2 (ja) | 2018-03-14 | 2023-05-30 | 富士電機株式会社 | 絶縁ゲート型半導体装置及びその製造方法 |
US11398556B2 (en) | 2020-07-09 | 2022-07-26 | Kabushiki Kaisha Toshiba | Semiconductor device, inverter circuit, drive device, vehicle, and elevator |
US11495665B2 (en) | 2020-07-09 | 2022-11-08 | Kabushiki Kaisha Toshiba | Semiconductor device, inverter circuit, drive device, vehicle, and elevator |
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