JP7331733B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP7331733B2 JP7331733B2 JP2020030685A JP2020030685A JP7331733B2 JP 7331733 B2 JP7331733 B2 JP 7331733B2 JP 2020030685 A JP2020030685 A JP 2020030685A JP 2020030685 A JP2020030685 A JP 2020030685A JP 7331733 B2 JP7331733 B2 JP 7331733B2
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Description
また、本開示に係る半導体装置は、第1主面と第1主面に対向する第2主面との間に設けられた第1導電型のドリフト層を有するセル領域と、セル領域を取り囲んで設けられ、第1主面と第2主面との間にドリフト層を有する終端領域と、第1主面に沿ってセル領域の一端側から対向するセル領域の他端側に向かって延伸し第1のピッチで互いに隣接して設けられた複数の第1のトレンチ内に、絶縁膜を介してドリフト層に対向して設けられた第1のトレンチ電極を有する第1のトレンチゲートと、第1のトレンチの延伸方向と交差する方向に延伸し複数の第1のトレンチのそれぞれの端部に接続された境界トレンチ内に、絶縁膜を介してドリフト層に対向して設けられ、第1のトレンチ電極に電気的に接続された境界トレンチ電極を有する境界トレンチゲートと、境界トレンチに接続された端部を有しセル領域の他端側に向かって延伸し第1のピッチとは異なる第2のピッチで互いに隣接して設けられた複数の第2のトレンチ内に、絶縁膜を介してドリフト層に対向して設けられ、境界トレンチ電極に電気的に接続された第2のトレンチ電極を有する第2のトレンチゲートと、を備え、セル領域は、第1主面とドリフト層との間に設けられた第2導電型のベース層と、第2主面とドリフト層との間に設けられた第2導電型のコレクタ層と、を有するIGBT領域と、パッド領域と、を有し、第1のトレンチゲート、第2のトレンチゲートおよび境界トレンチゲートは、IGBT領域に設けられ、第1のトレンチゲート、第2のトレンチゲートおよび境界トレンチゲートは、パッド領域に設けられたゲートパッドまたは第1主面に設けられたエミッタ電極のいずれか一方に電気的に接続され、ゲートパッドに電気的に接続された第1のトレンチゲート、第2のトレンチゲートおよび記境界トレンチゲートを含むアクティブトレンチゲートと、エミッタ電極に電気的に接続された第1のトレンチゲート、第2のトレンチゲートおよび境界トレンチゲートを含むダミートレンチゲートと、を含む。
まず、実施の形態1における半導体装置の構成を説明する。図1は、実施の形態1における半導体装置を示す平面図である。
図18は、実施の形態2における半導体装置を示す平面図である。実施の形態2の半導体装置200は、IGBT領域10においてアクティブトレンチゲートゲートまたはダミートレンチゲートゲートが第1のピッチで設けられた第1のIGBT領域10aと第1のピッチより大きい第2のピッチで設けられた第2のIGBT領域10bを有し、第1のIGBT領域10aと第2のIGBT領域10bとの境界部に境界トレンチゲートを設けた構成が実施の形態1の半導体装置100とは異なる。実施の形態2では、実施の形態1と相違する部分について説明し、同一または対応する部分についての説明は省略する。
図20は、実施の形態3における半導体装置のダイオード領域の構成を示す部分拡大平面図である。図20は、図1の破線83で囲った領域を拡大して示したものである。実施の形態3の半導体装置は、実施の形態1の半導体装置100の変形例であり、第1のダイオードトレンチゲート21の端部21cの全てが、境界トレンチゲート23を挟んで第2のダイオードトレンチゲート22の端部22cと対向しない位置に設けられた構成が実施の形態1とは異なる。実施の形態3では、実施の形態1と相違する部分について説明し、同一または対応する部分についての説明は省略する。
図21は、実施の形態4における半導体装置のダイオード領域の構成を示す部分拡大平面図である。図21は、図1の破線83で囲った領域を拡大して示したものである。実施の形態4の半導体装置は、実施の形態1の半導体装置100の変形例であり、互いに隣接する第1のダイオードトレンチゲート21が第3のトレンチゲート71で接続され、互いに隣接する第2のダイオードトレンチゲート22が第4のトレンチゲート72で接続されている構成が実施の形態1とは異なる。実施の形態3では、実施の形態1と相違する部分について説明し、同一または対応する部分についての説明は省略する。なお、図21では、図6または図21とは異なり、p+型コンタクト層24およびp型アノード層25の表示を省略して示している。
10 IGBT領域
11 アクティブトレンチゲート、11a ゲートトレンチ電極、11b ゲートトレンチ絶縁膜
12 ダミートレンチゲート、12a ダミートレンチ電極12a ダミートレンチ絶縁膜
13 n+型ソース層、
15 p型ベース層
16 p+型コレクタ層、16a p+型終端コレクタ層
20 ダイオード領域、20a 第1のダイオード領域、20b 第2のダイオード領域
21 第1のダイオードトレンチゲート、21a 第1のダイオードトレンチ電極、21b 第1のダイオードトレンチ絶縁膜、21c 端部、21d 角部
22 第2のダイオードトレンチゲート、22a 第2のダイオードトレンチ電極、22b 第2のダイオードトレンチ絶縁膜、22c 端部、22d 角部
23 境界トレンチゲート、23a 境界トレンチ電極、23b 境界トレンチ絶縁膜
25 p型アノード層
26 n+型カソード層
30 終端領域
31 p+型終端ウェル層
51 第1のアクティブトレンチゲート、51a 第1のゲートトレンチ電極、51b 第1のゲートトレンチ絶縁膜、51c 端部
52 第2のアクティブトレンチゲート、52a 第2のゲートトレンチ電極、52b 第2のゲートトレンチ絶縁膜、52c 端部
61 第1のダミートレンチゲート、61a 第1のダミートレンチ電極、61b 第1のダミートレンチ絶縁膜、61c 端部
62 第2のダミートレンチゲート、62a 第2のダミートレンチ電極、62b 第2のダミートレンチ絶縁膜、62c 端部
71 第3のトレンチゲート、71a 第3のトレンチ電極、71b 第3のトレンチ絶縁膜
72 第4のトレンチゲート、72a 第4のトレンチ電極、72b 第4のトレンチ絶縁膜
Claims (7)
- 第1主面と前記第1主面に対向する第2主面との間に設けられた第1導電型のドリフト層を有するセル領域と、
前記セル領域を取り囲んで設けられ、前記第1主面と前記第2主面との間に前記ドリフト層を有する終端領域と、
前記第1主面に沿って前記セル領域の一端側から対向する前記セル領域の他端側に向かって延伸し第1のピッチで互いに隣接して設けられた複数の第1のトレンチ内に、絶縁膜を介して前記ドリフト層に対向して設けられた第1のトレンチ電極を有する第1のトレンチゲートと、
前記第1のトレンチの延伸方向と交差する方向に延伸し複数の前記第1のトレンチのそれぞれの端部に接続された境界トレンチ内に、絶縁膜を介して前記ドリフト層に対向して設けられ、前記第1のトレンチ電極に電気的に接続された境界トレンチ電極を有する境界トレンチゲートと、
前記境界トレンチに接続された端部を有し前記セル領域の前記他端側に向かって延伸し前記第1のピッチとは異なる第2のピッチで互いに隣接して設けられた複数の第2のトレンチ内に、絶縁膜を介して前記ドリフト層に対向して設けられ、前記境界トレンチ電極に電気的に接続された第2のトレンチ電極を有する第2のトレンチゲートと、
を備え、
前記セル領域は、前記第1主面と前記ドリフト層との間に設けられた第2導電型のアノード層と、前記第2主面と前記ドリフト層との間に設けられた第1導電型のカソード層と、を有するダイオード領域を有し、
前記第1のトレンチゲート、前記第2のトレンチゲートおよび前記境界トレンチゲートは、前記ダイオード領域に設けられた半導体装置。 - 第1主面と前記第1主面に対向する第2主面との間に設けられた第1導電型のドリフト層を有するセル領域と、
前記セル領域を取り囲んで設けられ、前記第1主面と前記第2主面との間に前記ドリフト層を有する終端領域と、
前記第1主面に沿って前記セル領域の一端側から対向する前記セル領域の他端側に向かって延伸し第1のピッチで互いに隣接して設けられた複数の第1のトレンチ内に、絶縁膜を介して前記ドリフト層に対向して設けられた第1のトレンチ電極を有する第1のトレンチゲートと、
前記第1のトレンチの延伸方向と交差する方向に延伸し複数の前記第1のトレンチのそれぞれの端部に接続された境界トレンチ内に、絶縁膜を介して前記ドリフト層に対向して設けられ、前記第1のトレンチ電極に電気的に接続された境界トレンチ電極を有する境界トレンチゲートと、
前記境界トレンチに接続された端部を有し前記セル領域の前記他端側に向かって延伸し前記第1のピッチとは異なる第2のピッチで互いに隣接して設けられた複数の第2のトレンチ内に、絶縁膜を介して前記ドリフト層に対向して設けられ、前記境界トレンチ電極に電気的に接続された第2のトレンチ電極を有する第2のトレンチゲートと、
を備え、
前記セル領域は、
前記第1主面と前記ドリフト層との間に設けられた第2導電型のベース層と、前記第2主面と前記ドリフト層との間に設けられた第2導電型のコレクタ層と、を有するIGBT領域と、
パッド領域と、を有し、
前記第1のトレンチゲート、前記第2のトレンチゲートおよび前記境界トレンチゲートは、前記IGBT領域に設けられ、
前記第1のトレンチゲート、前記第2のトレンチゲートおよび前記境界トレンチゲートは、前記パッド領域に設けられたゲートパッドまたは前記第1主面に設けられたエミッタ電極のいずれか一方に電気的に接続され、
前記ゲートパッドに電気的に接続された前記第1のトレンチゲート、前記第2のトレンチゲートおよび前記境界トレンチゲートを含むアクティブトレンチゲートと、
前記エミッタ電極に電気的に接続された前記第1のトレンチゲート、前記第2のトレンチゲートおよび前記境界トレンチゲートを含むダミートレンチゲートと、を含む半導体装置。 - 前記第2のピッチは、前記第1のピッチより大きい請求項1または請求項2に記載の半導体装置。
- 前記終端領域は、
前記第1主面と前記ドリフト層との間に設けられた第2導電型の終端ウェル層と、
前記第2主面と前記ドリフト層との間に設けられた第2導電型
の終端コレクタ層と、
を有する請求項1から3のいずれか1項に記載の半導体装置。 - 複数の前記第1のトレンチゲートのそれぞれの端部は、前記境界トレンチゲートを挟んで前記第2のトレンチゲートの端部と対向しない位置に設けられた請求項1から4のいずれか1項に記載の半導体装置。
- 前記境界トレンチゲートは、前記第1のトレンチゲートまたは前記第2のトレンチゲートとの接続部の全てにおいて、前記第1のトレンチゲートまたは前記第2のトレンチゲートとT字状に接続されている請求項1から4のいずれか1項に記載の半導体装置。
- 前記第1のトレンチの延伸方向と交差する方向に延伸し互いに隣接する前記第1のトレンチを接続した第3のトレンチ内に、絶縁膜を介して前記ドリフト層に対向して設けられた第3のトレンチ電極を有する第3のトレンチゲートと、
前記第2のトレンチの延伸方向と交差する方向に延伸し互いに隣接する前記第2のトレンチを接続した第4のトレンチ内に、絶縁膜を介して前記ドリフト層に対向して設けられた第4のトレンチ電極を有する第4のトレンチゲートと、
をさらに備えた請求項1から6のいずれか1項に記載の半導体装置。
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