JP6551156B2 - スーパージャンクション型mosfetデバイスおよび半導体チップ - Google Patents
スーパージャンクション型mosfetデバイスおよび半導体チップ Download PDFInfo
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Description
[先行技術文献]
[特許文献]
[特許文献1] 特開2013−084905号公報
[特許文献2] 特開2010−109033号公報
なお、図2は、図3(b)から図3(d)に示したp型カラム32、およびn型カラム34の拡散状態を示す線を省略している。後述の図についても同様にp型カラム32、およびn型カラム34の拡散状態を示す線を省略する。
Cf1=Cgd+{Cgf・Cdf/(Cgf+Cdf)}
Cf2=Cgd+{Cgf・Cdf/(Cgs+Cgf+Cdf)}
Dns≦Dns2
Dp≦Ddt
Wns2<Wdt≦Wpk
Claims (11)
- スーパージャンクション型MOSFETデバイスであって、
半導体基板と、
前記半導体基板の主面側に設けられ、第1導電型の不純物を有するベース領域と、
前記ベース領域の最表面の一部を含み、第2導電型の不純物を有するソース領域と、
前記ベース領域を貫通するゲート電極と、
前記ベース領域上に設けられ、前記ソース領域に電気的に接続したソース電極と、
前記ベース領域における前記ソース領域および前記ゲート電極が設けられた領域とは異なる領域において、前記ベース領域の前記最表面の全面に設けられ、前記ベース領域上に設けられた前記ソース電極と電気的に接続しており、前記ソース領域よりも低い第2導電型の不純物濃度を有する表面領域と
を備える、スーパージャンクション型MOSFETデバイス。 - 前記表面領域は、前記ソース領域の厚みより小さい厚みを有する
請求項1に記載のスーパージャンクション型MOSFETデバイス。 - 前記表面領域の第2導電型の不純物濃度と前記ベース領域の第1導電型の不純物濃度との比が、1以上1000以下である
請求項1または2に記載のスーパージャンクション型MOSFETデバイス。 - 前記半導体基板は、前記ベース領域の下に設けられ、交互に周期的に設けられた第1導電型の不純物を有する第1カラムと第2導電型の不純物を有する第2カラムとを有し、
前記ゲート電極は、前記ベース領域の前記最表面の一部から前記第2カラムに達して設けられており、
前記表面領域の一部から下方に向かって、前記第2カラムと前記第2カラムに隣接する前記第1カラムとの境界まで伸び、前記ゲート電極近傍における前記ベース領域と前記第1カラムとを空間的に分離する分離トレンチをさらに備える
請求項1から3のいずれか一項に記載の、スーパージャンクション型MOSFETデバイス。 - 前記第2カラムの上部は、前記第1カラムと前記第2カラムとの境界において前記第1カラムの側へ突出する突出部を有し、
前記分離トレンチの一部は、前記突出部に位置する
請求項4に記載のスーパージャンクション型MOSFETデバイス。 - 前記ゲート電極は、前記ベース領域の前記最表面から前記第2カラムに達して設けられたトレンチゲート電極であり、
前記分離トレンチの深さは、前記トレンチゲート電極の深さよりも深い
請求項4または5に記載のスーパージャンクション型MOSFETデバイス。 - 前記分離トレンチは、
絶縁膜と、
前記絶縁膜に接して設けられ、前記ゲート電極に電気的に接続されたトレンチ電極と
を有する
請求項4から6のいずれか一項に記載のスーパージャンクション型MOSFETデバイス。 - 前記分離トレンチは、
絶縁膜と、
前記絶縁膜に接して設けられ、前記ソース電極に電気的に接続されたトレンチ電極と
を有する
請求項4から6のいずれか一項に記載のスーパージャンクション型MOSFETデバイス。 - 前記半導体基板の前記主面に直交する平面で切断した断面において、
前記ゲート電極の中央から前記ソース領域の第1方向の端部までの距離をWns2とし、
前記ゲート電極の中央から前記分離トレンチの前記第1方向とは反対方向の端部までの距離をWdtとし、
前記ゲート電極の中央から前記第1カラムと前記第2カラムと境界までの距離をWpkとした場合に、
Wns2<Wdt≦Wpkを満たす
請求項4から8のいずれか一項に記載のスーパージャンクション型MOSFETデバイス。 - スーパージャンクション型MOSFETデバイスであって、
半導体基板と、
前記半導体基板の主面側に設けられ、第1導電型の不純物を有するベース領域と、
前記ベース領域の最表面の一部を含み、第2導電型の不純物を有するソース領域と、
前記ベース領域において前記ソース領域と隣接する一部の領域を覆うように、前記ベース領域上に設けられたゲート電極と、
前記ソース領域に電気的に接続し、前記ベース領域上に設けられたソース電極と、
前記ベース領域における前記ソース領域と、前記ゲート電極に覆われる前記一部の領域とは異なる領域とにおいて、前記ベース領域の前記最表面の全面に設けられ、前記ベース領域上に設けられた前記ソース電極と電気的に接続しており、前記ソース領域よりも低い第2導電型の不純物濃度を有する表面領域と
を備える、スーパージャンクション型MOSFETデバイス。 - 請求項1から10のいずれか一項に記載のスーパージャンクション型MOSFETデバイスと、
前記スーパージャンクション型MOSFETデバイスに並列に接続された還流ダイオードと
を備える、半導体チップ。
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US15/247,933 US10186574B2 (en) | 2015-10-29 | 2016-08-26 | Super junction MOSFET device and semiconductor chip |
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