JP2021125554A - 半導体装置 - Google Patents
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Abstract
【解決手段】半導体装置は、第1電極と第2電極との間の半導体部と、第1および第2制御電極と、を備える。前記第1制御電極は、前記第1電極と前記半導体部との間の第1トレンチ内に配置され、前記第2制御電極は、前記第2電極と前記半導体部との間の第2トレンチ内に配置される。前記半導体部は、第1導電形の第1層と、第2導電形の第2層と、第1導電形の第3層と、第2導電形の第4層と、第1導電形の第5層と、第1導電形の第6層と、を含む。前記第2層は、前記第1層と前記第1電極との間、前記第3層は、前記第2層と前記第1電極との間に設けられる。前記第4層は、前記第1層と前記第2電極との間、前記第5層は、前記第4層と前記第2電極との間、前記第6層は、前記第1層と前記第2電極との間に設けられる。前記第2電極は、前記第6層を含む第1導電形領域を介して前記第1層につながる。
【選択図】図1
Description
図1は、第1実施形態に係る半導体装置1を示す模式断面である。半導体装置1は、所謂、逆導通型IGBT(Insulated Gate Bipolar Transistor)である。
半導体装置2では、第7半導体層27が第1半導体層11と第6半導体層25との間に設けられない。
図8(a)および(b)は、第2実施形態に係る半導体装置4を示す模式図である。図8(a)は、半導体装置4の断面図である。図8(b)は、半導体装置4の制御方法を示すタイムチャートである。
Claims (20)
- 第1電極と、
前記第1電極に対向した第2電極と、
前記第1電極と前記第2電極との間に設けられた半導体部と、
前記第1電極と前記半導体部との間において、前記半導体部に設けられた第1トレンチの内部に配置され、前記半導体部から第1絶縁膜により電気的に絶縁され、前記第1電極から第2絶縁膜により電気的に絶縁された第1制御電極と、
前記第2電極と前記半導体部との間において、前記半導体部に設けられた第2トレンチの内部に配置され、前記半導体部から第3絶縁膜により電気的に絶縁され、前記第2電極から第4絶縁膜により電気的に絶縁された第2制御電極と、
を備え、
前記半導体部は、第1導電形の第1半導体層と、第2導電形の第2半導体層と、前記第1導電形の第3半導体層と、前記第2導電形の第4半導体層と、前記第1導電形の第5半導体層と、前記第1導電形の第6半導体層と、を含み、
前記第1半導体層は、前記第1電極と前記第2電極との間に延在し、前記第1トレンチおよび前記第2トレンチは、前記第1半導体層中に延在し、
前記第2半導体層は、前記第1半導体層と前記第1電極との間において、前記第1制御電極に前記第1絶縁膜を介して向き合うように設けられ、前記第1電極に電気的に接続され、
前記第3半導体層は、前記第2半導体層と前記第1電極との間に選択的に設けられ、前記第1絶縁膜に接し、前記第1電極に電気的に接続され、
前記第4半導体層は、前記第1半導体層と前記第2電極との間において、前記第2制御電極に前記第3絶縁膜を介して向き合うように設けられ、前記第2電極に電気的に接続され、
前記第5半導体層は、前記第4半導体層と前記第2電極との間に選択的に設けられ、前記第3絶縁膜に接し、前記第2電極に電気的に接続され、
前記第6半導体層は、前記第1半導体層と前記第2電極との間に選択的に設けられ、
前記第2電極は、前記第6半導体層を含む第1導電形領域を介して前記第1半導体層につながった半導体装置。 - 前記半導体部は、前記第1半導体層と前記第4半導体との間に設けられた第1導電形の第7半導体層をさらに含み、
前記第7半導体層は、前記第1半導体層の第1導電形不純物よりも高濃度の第1導電形不純物を含む請求項1記載の半導体装置。 - 前記半導体部は、前記第1半導体層と前記第6半導体層との間に設けられた別の第7半導体層をさらに含み、
前記第1導電形領域は、前記第6半導体層と前記別の第7半導体層とを含む請求項2記載の半導体装置。 - 前記第6半導体層は、前記第7半導体層の前記第1導電形不純物よりも高濃度の第1導電形不純物を含み、前記第2電極に電気的に接続された請求項2または3に記載の半導体装置。
- 前記第5半導体層は、前記第7半導体層の前記第1導電形不純物よりも高濃度の第1導電形不純物を含む請求項2または3に記載の半導体装置。
- 前記第2制御電極は、複数設けられ、
前記第6半導体層は、前記複数の第2制御電極のうちの隣合う2つの制御電極の間に設けられ、前記第3絶縁膜を介して前記2つの制御電極のそれぞれに向き合うように設けられる請求項1〜5のいずれか1つに記載の半導体装置。 - 前記第4半導体層は、前記複数の第2制御電極のうちの別の隣合う2つの制御電極の間に設けられ、
前記別の隣合う2つの制御電極の間隔は、前記隣合う2つの制御電極の間隔とは異なる請求項6記載の半導体装置。 - 前記半導体部は、前記第6半導体層と前記第2電極との間に設けられ、前記第6半導体層の第1導電形不純物よりも高濃度の第1導電形不純物を含む第1導電形の第8半導体層をさらに含み、
前記第2制御電極は、複数設けられ、
前記第4半導体層は、前記複数の第2制御電極のうちの1つに、前記第3絶縁膜を介して向き合い、
前記第6半導体層は、前記複数の第2制御電極のうちの別の第2制御電極に、別の第3絶縁膜を介して向き合い、
前記第8半導体層は、前記別の第3絶縁膜に接し、前記第2電極に電気的に接続される請求項1〜3のいずれか1つに記載の半導体装置。 - 前記第6半導体層は、前記第4半導体層と前記別の第2制御電極との間に設けられる請求項8記載の半導体装置。
- 前記第6半導体層は、前記別の第2制御電極に印加される電圧により、その全体が第2導電形に反転する請求項9記載の半導体装置。
- 前記第4半導体層は、前記第2半導体層の第2導電形不純物と略同一の濃度を有する第2導電形不純物を含む請求項1〜10のいずれか1つに記載の半導体装置。
- 第1電極と、
前記第1電極に対向した第2電極と、
前記第1電極と前記第2電極との間に設けられた半導体部と、
前記第1電極と前記半導体部との間において、前記半導体部に設けられた第1トレンチの内部に配置され、前記半導体部から第1絶縁膜により電気的に絶縁され、前記第1電極から第2絶縁膜により電気的に絶縁された第1制御電極と、
前記第2電極と前記半導体部との間において、前記半導体部に設けられた複数の第2トレンチの内部にそれぞれ配置され、前記半導体部から第3絶縁膜により電気的に絶縁され、前記第2電極から第4絶縁膜により電気的に絶縁された複数の第2制御電極と、
を備え、
前記半導体部は、第1導電形の第1半導体層と、第2導電形の第2半導体層と、前記第1導電形の第3半導体層と、前記第2導電形の第4半導体層と、前記第1導電形の第5半導体層と、前記第2導電形の第9半導体層と、を含み、
前記第1半導体層は、前記第1電極と前記第2電極との間に延在し、前記第1トレンチおよび前記第2トレンチは、前記第1半導体中に延在し、
前記第2半導体層は、前記第1半導体層と前記第1電極との間において、前記第1制御電極に前記第1絶縁膜を介して向き合うように設けられ、前記第1電極に電気的に接続され、
前記第3半導体層は、前記第2半導体層と前記第1電極との間に選択的に設けられ、前記第1絶縁膜に接し、前記第1電極に電気的に接続され、
前記第4半導体層は、前記第1半導体層と前記第2電極との間において、前記複数の第2制御電極のうちの1つに前記第3絶縁膜を介して向き合うように設けられ、前記第2電極に電気的に接続され、
前記第5半導体層は、前記第4半導体層と前記第2電極との間に選択的に設けられ、前記第3絶縁膜に接し、前記第2電極に電気的に接続され、
前記第9半導体層は、前記第1半導体層と前記第2電極との間において、前記複数の第2制御電極のうちの別の第2制御電極に別の第3絶縁膜を介して向き合うように設けられ、前記第4半導体層の第2導電形不純物よりも低濃度の第2導電形不純物を含む半導体装置。 - 前記半導体部は、前記第9半導体層と前記第2電極との間に設けられ、前記別の第3絶縁膜に接し、前記第2電極に電気的に接続された別の第5半導体層をさらに含む請求項12記載の半導体装置。
- 前記半導体部は、前記第1半導体層と前記第4半導体との間および前記第1半導体層と前記第9半導体層との間に設けられた第1導電形の第7半導体層をさらに含み、
前記第7半導体層は、前記第1半導体層の第1導電形不純物よりも高濃度の第1導電形不純物を含み、
前記第5半導体層は、前記第7半導体層の前記第1導電形不純物よりも高濃度の第1導電形不純物を含む請求項13記載の半導体装置。 - 前記第9半導体層は、前記第4半導体層と前記別の第2制御電極との間に位置する請求項12〜14のいずれか1つに記載の半導体装置。
- 前記第9半導体層は、前記別の第2制御電極と隣合う他の第2制御電極との間に位置し、
前記他の第2制御電極と他の第3絶縁膜を介して向き合うように設けられる請求項12〜14のいずれか1つに記載の半導体装置。 - 前記第1制御電極は、複数設けられ、
前記複数の第1制御電極のうちの隣合う2つの第1制御電極の間隔は、前記複数の第2制御電極のうちの隣合う2つの第2制御電極の間隔とは異なる請求項12〜16のいずれか1つに記載の半導体装置。 - 前記1つの第2制御電極の閾値電圧は、前記別の第2制御電極の閾値電圧よりも高い請求項12〜17のいずれか1つに記載の半導体装置。
- 前記第3半導体層は、前記第1半導体層の第1導電形不純物よりも高濃度の第1導電形不純物を含む請求項1〜18のいずれか1つに記載の半導体装置。
- 前記半導体層は、前記第1半導体層と前記第2半導体層との間に設けられ、前記第1半導体層の第1不純物よりも高濃度の第1導電形不純物を含む前記第1導電形の第10半導体層をさらに含み、
前記第10半導体層は、前記第3半導体層の前記第1導電形不純物よりも低濃度の前記第1導電形不純物を含む請求項18記載の半導体装置。
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