JP6531837B2 - 半導体装置および製造方法 - Google Patents
半導体装置および製造方法 Download PDFInfo
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Description
関連する先行技術文献として下記の文献がある。
特許文献1 特開2009−26797号公報
特許文献2 特開2000−106434号公報
特許文献3 特開2008−34794号公報
Claims (21)
- 半導体基板と、
前記半導体基板のおもて面側に設けられ、それぞれが延伸方向に延伸する部分を有する複数のトレンチ部と、
隣接する2つのトレンチ部の間に設けられ、前記延伸方向において交互に前記半導体基板のおもて面に露出する第1導電型のエミッタ領域および第2導電型のコンタクト領域と、
前記エミッタ領域および前記コンタクト領域の下方に設けられ、前記コンタクト領域よりも不純物濃度の低い第2導電型のベース領域と、
前記ベース領域の下方に設けられ、前記エミッタ領域よりも不純物濃度の低い第1導電型のドリフト領域と、
前記ドリフト領域の下方に設けられた第2導電型のコレクタ領域と
を備え、
前記半導体基板のおもて面において、前記2つのトレンチ部の間の中央位置における前記エミッタ領域の長さは、前記トレンチ部に接する部分における前記エミッタ領域の長さよりも短く、
前記半導体基板のおもて面において、前記エミッタ領域の境界の少なくとも一部が曲線形状であり、
前記コンタクト領域は、前記エミッタ領域よりも深い位置まで設けられ、
前記中央位置における前記エミッタ領域の長さは、前記中央位置における前記エミッタ領域の深さと、前記コンタクト領域の深さとの差よりも大きく、
前記延伸方向における前記コンタクト領域の中央部分は、前記半導体基板のおもて面において前記2つのトレンチ部の側壁と接して形成され、
前記半導体基板のおもて面において、前記トレンチ部の側壁で前記コンタクト領域が露出し、複数の前記エミッタ領域が互いに離間されている半導体装置。 - 前記半導体基板のおもて面において、延伸方向における前記コンタクト領域は、前記トレンチ部の側壁の前記延伸方向に沿って形成される、
請求項1に記載の半導体装置。 - 前記中央位置における前記エミッタ領域の長さは、前記トレンチ部に接する部分の前記エミッタ領域の長さの1/3より大きい
請求項1または2に記載の半導体装置。 - 前記中央位置における前記エミッタ領域の長さは、前記2つのトレンチ部の距離の半分よりも大きい
請求項1から3のいずれか一項に記載の半導体装置。 - 前記コンタクト領域の少なくとも一部の領域が、前記トレンチ部に近づくほど徐々に浅く形成されている
請求項1から4のいずれか一項に記載の半導体装置。 - 前記コンタクト領域は、前記半導体基板のおもて面において、前記トレンチ部の側壁と前記エミッタ領域の境界とが接する点とは離れて形成される
請求項5に記載の半導体装置。 - 前記半導体基板のおもて面において1つの前記エミッタ領域を挟んで設けた2つの前記コンタクト領域は、前記半導体基板の内部においても分離している
請求項1から6のいずれか一項に記載の半導体装置。 - 前記半導体基板のおもて面において1つの前記エミッタ領域を挟んで設けた2つの前記コンタクト領域は、前記エミッタ領域の下側で接続されている
請求項1から6のいずれか一項に記載の半導体装置。 - 前記トレンチ部の幅は、前記2つのトレンチ部の距離よりも大きい
請求項1から8のいずれか一項に記載の半導体装置。 - 前記半導体基板のおもて面に形成され、前記コンタクト領域に対向する領域と前記エミッタ領域に対向する領域とにコンタクトホールが形成された層間絶縁膜を更に備え、
前記コンタクトホールは、前記中央位置に対向する領域に形成され、且つ、前記トレンチ部と接する領域には形成されない
請求項1から9のいずれか一項に記載の半導体装置。 - 前記コンタクトホールは、前記エミッタ領域の長さが略一定となる領域に対向して形成される
請求項10に記載の半導体装置。 - 半導体基板と、
前記半導体基板のおもて面側に設けられ、それぞれが延伸方向に延伸する部分を有する複数のトレンチ部と、
隣接する2つのトレンチ部の間に設けられ、前記延伸方向において交互に前記半導体基板のおもて面に露出する第1導電型のエミッタ領域および第2導電型のコンタクト領域と
を備え、
前記半導体基板のおもて面において、前記2つのトレンチ部の間の中央位置における前記エミッタ領域の長さは、前記トレンチ部に接する部分における前記エミッタ領域の長さよりも短く、
前記半導体基板のおもて面において、前記エミッタ領域の境界の少なくとも一部が曲線形状であり、
前記半導体基板のおもて面に形成され、前記コンタクト領域に対向する領域と前記エミッタ領域に対向する領域とにコンタクトホールが形成された層間絶縁膜を更に備え、
前記コンタクトホールは、前記中央位置に対向する領域に形成され、且つ、前記トレンチ部と接する領域には形成されず、
前記エミッタ領域に対向して形成された前記コンタクトホールのうち、少なくとも一部の領域の幅は、前記コンタクト領域に対向して形成された前記コンタクトホールの幅よりも大きい
半導体装置。 - 半導体基板と、
前記半導体基板のおもて面側に設けられ、それぞれが延伸方向に延伸する部分を有する複数のトレンチ部と、
隣接する2つのトレンチ部の間に設けられ、前記延伸方向において交互に前記半導体基板のおもて面に露出する第1導電型のエミッタ領域および第2導電型のコンタクト領域と
を備え、
前記半導体基板のおもて面において、前記2つのトレンチ部の間の中央位置における前記エミッタ領域の長さは、前記トレンチ部に接する部分における前記エミッタ領域の長さよりも短く、
前記半導体基板のおもて面において、前記エミッタ領域の境界の少なくとも一部が曲線形状であり、
前記コンタクト領域の少なくとも一部の領域が、前記トレンチ部に近づくほど徐々に浅く形成され、
前記コンタクト領域は、前記半導体基板のおもて面において、前記トレンチ部の側壁と前記エミッタ領域の境界とが接する点とは離れて形成され、
前記トレンチ部に挟まれ、前記トレンチ部に接する箇所で前記トレンチの深さよりも浅く、前記コンタクト領域の深さよりも深く、前記コンタクト領域よりも不純物濃度の低い第2導電型のベース領域を備え、
前記ベース領域が前記半導体基板のおもて面に露出し、
前記コンタクト領域の前記トレンチ部と接する部分の端が、前記半導体基板のおもて面に露出した前記ベース領域と接している
半導体装置。 - 前記ベース領域の下方に設けられ、前記エミッタ領域よりも不純物濃度の低いドリフト領域と、
前記ドリフト領域と前記ベース領域との間に設けられ、前記ドリフト領域よりも不純物濃度の高い蓄積領域と
を更に備える請求項13に記載の半導体装置。 - 前記半導体基板の上方に形成されたエミッタ電極と、
前記半導体基板と前記エミッタ電極との間に形成された層間絶縁膜と
を更に備え、
前記層間絶縁膜には、前記エミッタ電極を前記コンタクト領域に接続するためのコンタクトホールが形成され、
前記コンタクト領域において前記エミッタ電極と接する領域には、前記コンタクト領域の他の部分よりも高濃度のプラグインプラ領域が形成されている
請求項14に記載の半導体装置。 - 半導体基板と、前記半導体基板のおもて面側に設けられ、それぞれが延伸方向に延伸する部分を有する複数のトレンチ部と、隣接する2つのトレンチ部の間に設けられ、前記延伸方向において交互に前記半導体基板のおもて面に露出する第1導電型のエミッタ領域、および前記エミッタ領域より深く設けられた第2導電型のコンタクト領域と、前記エミッタ領域および前記コンタクト領域の下方に設けられ、前記コンタクト領域よりも不純物濃度の低い第2導電型のベース領域と、前記ベース領域の下方に設けられ、前記エミッタ領域よりも不純物濃度の低い第1導電型のドリフト領域と、前記ドリフト領域の下方に設けられた第2導電型のコレクタ領域とを備える半導体装置を製造する製造方法であって、
前記エミッタ領域を、前記2つのトレンチ部の間隔よりも開口幅の大きいエミッタマスクを用いて、前記半導体基板のおもて面に第1導電型の不純物を注入して形成し、
前記コンタクト領域を、前記2つのトレンチ部の間隔よりも開口幅の小さいコンタクトマスクを用いて、前記半導体基板のおもて面に第2導電型の不純物を注入して形成し、
前記第2導電型の不純物を注入する領域の一部が、前記第1導電型の不純物を注入する領域と重複しており、
前記半導体基板のおもて面において、前記2つのトレンチ部の間の中央位置における前記エミッタ領域の長さは、前記中央位置における前記エミッタ領域の深さと、前記コンタクト領域の深さとの差よりも大きく、
前記コンタクトマスクの開口は、それぞれの前記コンタクト領域毎に分離しており、
前記半導体基板のおもて面において、前記トレンチ部の側壁で前記コンタクト領域が露出し、複数の前記エミッタ領域が互いに離間されている製造方法。 - 前記第2導電型の不純物を注入する前記半導体基板の部分が、前記第1導電型の不純物を注入する部分と重複している、請求項16に記載の製造方法。
- それぞれの前記開口の間隔は、前記2つのトレンチ部の間の中央位置における前記エミッタ領域の深さと前記コンタクト領域の深さとの差よりも大きい
請求項16または17に記載の製造方法。 - 前記2つのトレンチ部の間の中央位置における前記エミッタ領域の長さは、前記トレンチ部と、前記コンタクトマスクの開口との距離よりも大きい
請求項16または17に記載の製造方法。 - 前記半導体基板のおもて面において、前記トレンチ部の側壁でベース領域が露出し、複数の前記エミッタ領域が互いに離間されている
請求項1から15のいずれか一項に記載の半導体装置。 - 前記コンタクトマスクのそれぞれの開口の両端が、前記エミッタマスクの開口と重なっている
請求項16から19のいずれか一項に記載の製造方法。
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