JP2022120620A - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- JP2022120620A JP2022120620A JP2021017636A JP2021017636A JP2022120620A JP 2022120620 A JP2022120620 A JP 2022120620A JP 2021017636 A JP2021017636 A JP 2021017636A JP 2021017636 A JP2021017636 A JP 2021017636A JP 2022120620 A JP2022120620 A JP 2022120620A
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Abstract
Description
図1は、実施の形態1に係る半導体装置100の平面図である。図2は、図1をA-A直線で切断することで得られる断面図である。半導体装置100は例えばIGBT(Insulated Gate Bipolar Transistor)である。半導体装置100は例えば電力半導体装置として使用される。
図15は、実施の形態2に係る半導体装置200の断面図である。半導体装置200は、n型であり、ドリフト層20よりも高濃度のキャリアストアド層26を備える。キャリアストアド層26は、ドリフト層20の上面50a側でベース層24よりも深い位置まで設けられる。他の構成は、半導体装置100の構成と同じである。
図16は、実施の形態3に係る半導体装置300の断面図である。半導体装置300は、トレンチ12の下に設けられたp型のボトム層28を備える。他の構成は、半導体装置100の構成と同じである。ボトム層28により、スイッチング時にトレンチゲートの底部に電界が集中することを抑制できる。従って、SOA耐量をさらに向上できる。
図17は、実施の形態4に係る半導体装置400の断面図である。半導体装置400において、エミッタ電極10はトレンチコンタクト29を有する。トレンチコンタクト29は、互いに隣接する一対のトレンチ12の間で、基板50の上面50aからエミッタ層23を貫通し、ベース層24の内部まで突出している。コンタクト層25は、ベース層24の内部において、トレンチコンタクト29の底部に接するように設けられる。他の構成は、半導体装置100の構成と同じである。
図18は、実施の形態5に係る半導体装置500の断面図である。半導体装置500においてゲート電極は、第1ゲート電極14aと、ゲート絶縁膜13を介して第1ゲート電極14aの下方に設けられた第2ゲート電極14bを有する。第1ゲート電極14aは交点18よりも上方に設けられ、第2ゲート電極14bは交点18よりも下方に設けられる。他の構成は、半導体装置100の構成と同じである。2段ゲート構造を適用することでゲート絶縁膜13の厚さが確保され、帰還容量を低減できる。
図19は、実施の形態6に係る半導体装置600の断面図である。半導体装置600は、トレンチ12を複数備える。複数のトレンチ12は、ベース層24とエミッタ層23を介さずに隣接する一対のトレンチ12を含む。当該一対のトレンチ12の間には、p型のキャリア蓄積層27が設けられる。他の構成は、半導体装置100の構成と同じである。
図20は、実施の形態7に係る半導体装置700の断面図である。半導体装置700はRC(Reverse-Conducting)-IGBTである。半導体装置700では、ダイオードとIGBTが同一の基板50に形成されている。ダイオード領域では、コレクタ層22がn型のカソード層32に置き換わっている。また、ダイオード領域には、エミッタ層23およびコンタクト層25が設けられない。半導体装置700においても、実施の形態1と同様の効果を得ることができる。
Claims (13)
- 上面と、前記上面と反対側の裏面を有する基板と、
前記基板の前記上面側に設けられた第1導電型のドリフト層と、
前記ドリフト層の前記上面側に設けられ、前記第1導電型と異なる第2導電型のベース層と、
前記ベース層の前記上面側に設けられた前記第1導電型の上部半導体層と、
前記基板の前記上面に設けられ、前記上部半導体層と電気的に接続される第1電極と、
前記基板の前記裏面に設けられた第2電極と、
前記基板の前記上面から前記上部半導体層と前記ベース層を貫通し前記ドリフト層まで延びるトレンチと、
前記トレンチの内部に設けられたゲート電極と、
を備え、
前記トレンチの内側面は、第1面と前記第1面よりも下方に設けられた第2面を有し、
前記第2面は、前記第1面に対して前記トレンチの内側に向かって傾き、
前記第1面と前記第2面の交点は、前記ベース層よりも下方に設けられることを特徴とする半導体装置。 - 前記第1面と前記基板の前記上面とのなす角は、89度より大きく90度以下であり、
前記第2面と前記基板の前記上面とのなす角は、86度より大きく88度以下であることを特徴とする請求項1または2に記載の半導体装置。 - 前記ドリフト層の前記上面側で前記ベース層よりも深い位置まで設けられ、前記第1導電型であり、前記ドリフト層よりも高濃度のキャリアストアド層を備えることを特徴とする請求項1から4の何れか1項に記載の半導体装置。
- 前記トレンチの下に設けられ、前記第2導電型のボトム層を備えることを特徴とする請求項1から5の何れか1項に記載の半導体装置。
- 前記第1電極は、互いに隣接する一対の前記トレンチの間で、前記基板の前記上面から前記上部半導体層を貫通し前記ベース層の内部まで突出したトレンチコンタクトを有することを特徴とする請求項1から6の何れか1項に記載の半導体装置。
- 前記ゲート電極は、第1ゲート電極と、ゲート絶縁膜を介して前記第1ゲート電極の下方に設けられた第2ゲート電極を有し、
前記第1ゲート電極は前記交点よりも上方に設けられ、
前記第2ゲート電極は前記交点よりも下方に設けられることを特徴とする請求項1から7の何れか1項に記載の半導体装置。 - 前記トレンチを複数備え、
前記複数のトレンチは、前記ベース層と前記上部半導体層を介さずに隣接する一対のトレンチを含み、
前記一対のトレンチの間には、前記第2導電型のキャリア蓄積層が設けられることを特徴とする請求項1から8の何れか1項に記載の半導体装置。 - 前記半導体装置はRC-IGBTであることを特徴とする請求項1から9の何れか1項に記載の半導体装置。
- 前記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から10の何れか1項に記載の半導体装置。
- 前記ワイドバンドギャップ半導体は、炭化珪素、窒化ガリウム系材料またはダイヤモンドであることを特徴とする請求項11に記載の半導体装置。
- 上面と、前記上面と反対側の裏面を有する基板の前記上面側に第1導電型のドリフト層を形成し、
前記ドリフト層の前記上面側に前記第1導電型と異なる第2導電型のベース層を形成し、
前記ベース層の前記上面側に前記第1導電型の上部半導体層を形成し、
エッチングにより、前記基板の前記上面から前記ベース層よりも下方となる深さまで延びる第1トレンチを形成し、
前記第1トレンチの形成時よりもエッチングガスの圧力を高めること、前記第1トレンチの形成時よりもエッチングに用いられるイオンの加圧電圧を低下させること、または、前記第1トレンチの形成時よりもエッチングに伴って発生する副生成物が堆積し易い条件とすることの少なくとも1つを実施して、前記第1トレンチの底部からエッチングを行い、第2トレンチを形成し、
前記基板の前記上面に前記上部半導体層と電気的に接続される第1電極を形成し、
前記基板の前記裏面に第2電極を形成し、
前記第1トレンチと前記第2トレンチから形成されたトレンチの内部にゲート電極を形成することを特徴とする半導体装置の製造方法。
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