JP2021125595A - 半導体装置 - Google Patents
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 97
- 239000000758 substrate Substances 0.000 claims abstract description 39
- 239000010410 layer Substances 0.000 claims description 70
- 239000002344 surface layer Substances 0.000 claims description 11
- 239000012535 impurity Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 16
- 229910052814 silicon oxide Inorganic materials 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 14
- 108010075750 P-Type Calcium Channels Proteins 0.000 description 9
- 238000005530 etching Methods 0.000 description 9
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 8
- 229920005591 polysilicon Polymers 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 108091006146 Channels Proteins 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 208000032368 Device malfunction Diseases 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 229910002601 GaN Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
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Abstract
【解決手段】第1導電型の半導体基板1の上面側に複数のゲートトレンチ2が形成されている。ゲート電極3が複数のゲートトレンチ2に埋め込まれている。複数のダミーゲートトレンチ9が、半導体基板1の上面側において、隣り合うゲートトレンチ2の間に等間隔で形成されている。ダミーゲート電極10が複数のダミーゲートトレンチ9に埋め込まれ、エミッタ電極13に接続されている。隣り合うゲートトレンチ2とダミーゲートトレンチ9の間隔は、隣り合うダミーゲートトレンチ9同士の間隔よりも小さい。
【選択図】図1
Description
図1は、実施の形態1に係る半導体装置を示す断面図である。ここで例示する半導体装置は3300Vの高耐圧クラスのIGBTであるが、耐圧クラスはこれに限定されない。
T1 2≦(r1+r2)2−d2 ・・・式(2)
2r2=T2 ・・・式(3)
ここで、r1はゲートトレンチ2の底から空乏層の端までの距離、r2はダミーゲートトレンチ9の底から空乏層の端までの距離、dはダミーゲートトレンチ9とゲートトレンチ2の深さの差である。
T1 2≦(2r2−r´)2−d2 ・・・式(4)
図20は、実施の形態2に係る半導体装置を示す断面図である。ゲートトレンチ2の幅w1がダミーゲートトレンチ9の幅w2より小さい。その他の構成は実施の形態1と同様である。
Claims (5)
- 第1導電型の半導体基板と、
前記半導体基板の上面側に形成された複数のゲートトレンチと、
前記複数のゲートトレンチに埋め込まれたゲート電極と、
前記ゲート電極と前記半導体基板との間に形成されたゲート絶縁膜と、
前記半導体基板の上面側の表層部に形成された第2導電型のチャネル層と、
前記チャネル層の表層部に形成され、前記チャネル層よりも不純物のピーク濃度の高い第2導電型のコンタクト層と、
前記ゲートトレンチに隣接するように前記チャネル層の表層部に形成された第1導電型のエミッタ層と、
前記コンタクト層に接続されたエミッタ電極と、
前記半導体基板の上面側において、隣り合う前記ゲートトレンチの間に等間隔で形成された複数のダミーゲートトレンチと、
前記複数のダミーゲートトレンチに埋め込まれ、前記エミッタ電極に接続されたダミーゲート電極と、
前記ダミーゲート電極と前記半導体基板との間に形成されたダミーゲート絶縁膜とを備え、
隣り合う前記ゲートトレンチと前記ダミーゲートトレンチの間隔は、隣り合う前記ダミーゲートトレンチ同士の間隔よりも小さいことを特徴とする半導体装置。 - 隣り合う前記ダミーゲートトレンチ同士の間隔をT2、前記ゲートトレンチの幅の半値をrt1、前記ダミーゲートトレンチの幅の半値をrt2、前記ゲートトレンチの底での前記半導体基板の不純物濃度をN1、前記ダミーゲートトレンチの底での前記半導体基板の不純物濃度をN2として、前記ゲートトレンチの底から空乏層の端までの距離r1と前記ダミーゲートトレンチの底から空乏層の端までの距離r2が
を満たし、
前記半導体装置のユニットセルに含まれる前記ゲートトレンチと前記ダミーゲートトレンチの合計本数をD、前記ユニットセルの幅をW、前記ダミーゲートトレンチと前記ゲートトレンチの深さの差をd、r´=r2−r1として、隣り合う前記ゲートトレンチと前記ダミーゲートトレンチの間隔T1が
を満たすことを特徴とする請求項1に記載の半導体装置。 - 前記ゲートトレンチの幅が前記ダミーゲートトレンチの幅より小さいことを特徴とする請求項1又は2に記載の半導体装置。
- 前記半導体基板と前記チャネル層の間に形成されたN型キャリア蓄積層を更に備え、
隣り合う前記ダミーゲートトレンチ同士の間隔は15umより小さい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。 - 前記半導体基板はワイドバンドギャップ半導体によって形成されてい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。
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JP2020018914A JP7331720B2 (ja) | 2020-02-06 | 2020-02-06 | 半導体装置 |
US17/011,456 US11227927B2 (en) | 2020-02-06 | 2020-09-03 | Semiconductor device |
DE102020127671.0A DE102020127671B4 (de) | 2020-02-06 | 2020-10-21 | Halbleitervorrichtung |
CN202110136014.6A CN113224145A (zh) | 2020-02-06 | 2021-02-01 | 半导体装置 |
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JP2004022941A (ja) * | 2002-06-19 | 2004-01-22 | Toshiba Corp | 半導体装置 |
JP2019186318A (ja) * | 2018-04-05 | 2019-10-24 | 三菱電機株式会社 | 半導体装置および電力変換装置 |
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JP3927111B2 (ja) * | 2002-10-31 | 2007-06-06 | 株式会社東芝 | 電力用半導体装置 |
JP4688901B2 (ja) | 2008-05-13 | 2011-05-25 | 三菱電機株式会社 | 半導体装置 |
JP5488691B2 (ja) * | 2010-03-09 | 2014-05-14 | 富士電機株式会社 | 半導体装置 |
JP2012248686A (ja) * | 2011-05-27 | 2012-12-13 | Elpida Memory Inc | 半導体装置及びその製造方法 |
DE112011105681B4 (de) * | 2011-09-28 | 2015-10-15 | Toyota Jidosha Kabushiki Kaisha | Verfahren zur Herstellung einer Halbleitervorrichtung |
JP5891023B2 (ja) * | 2011-12-07 | 2016-03-22 | 株式会社 日立パワーデバイス | 半導体装置及びそれを用いた電力変換装置 |
JP6190206B2 (ja) | 2012-08-21 | 2017-08-30 | ローム株式会社 | 半導体装置 |
WO2015029709A1 (ja) | 2013-08-27 | 2015-03-05 | 富士フイルム株式会社 | 内視鏡システム |
CN104425279B (zh) * | 2013-09-04 | 2018-03-06 | 中芯国际集成电路制造(上海)有限公司 | 鳍式场效应晶体管及其形成方法、半导体器件 |
WO2016175152A1 (ja) * | 2015-04-27 | 2016-11-03 | ローム株式会社 | 半導体装置および半導体装置の製造方法 |
US20180204909A1 (en) * | 2015-08-26 | 2018-07-19 | Mitsubishi Electric Corporation | Semiconductor device |
US10192978B2 (en) * | 2016-01-19 | 2019-01-29 | Mitsubishi Electric Corporation | Semiconductor apparatus |
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JP2004022941A (ja) * | 2002-06-19 | 2004-01-22 | Toshiba Corp | 半導体装置 |
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DE102020127671A1 (de) | 2021-08-12 |
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CN113224145A (zh) | 2021-08-06 |
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