JP6791312B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP6791312B2 JP6791312B2 JP2019127251A JP2019127251A JP6791312B2 JP 6791312 B2 JP6791312 B2 JP 6791312B2 JP 2019127251 A JP2019127251 A JP 2019127251A JP 2019127251 A JP2019127251 A JP 2019127251A JP 6791312 B2 JP6791312 B2 JP 6791312B2
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- 230000007547 defect Effects 0.000 claims description 8
- 238000009825 accumulation Methods 0.000 description 35
- 239000000969 carrier Substances 0.000 description 15
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- 238000011084 recovery Methods 0.000 description 8
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- 230000006378 damage Effects 0.000 description 5
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- 239000004020 conductor Substances 0.000 description 4
- 239000000852 hydrogen donor Substances 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 4
- 229920005591 polysilicon Polymers 0.000 description 4
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- 239000000463 material Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
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- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229910002601 GaN Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
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- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
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Description
特開2015−135954号公報
Claims (23)
- 第1導電型のドリフト領域および前記ドリフト領域の上方に設けられた第2導電型のベース領域を有する半導体基板と、
前記半導体基板に形成されたトランジスタ部と、
前記トランジスタ部と隣接して前記半導体基板に形成されたダイオード部と
を備え、
前記トランジスタ部および前記ダイオード部には、
それぞれ予め定められた配列方向に沿って配列された複数のトレンチ部と、
それぞれのトレンチ部の間に形成された複数のメサ部と
が形成され、
前記トランジスタ部は、
前記ベース領域の上方において、前記半導体基板の上面に露出し、前記ドリフト領域よりも高濃度の第1導電型のエミッタ領域と、
前記ベース領域の上方において、前記半導体基板の上面に露出し、前記ベース領域よりも高濃度の第2導電型のコンタクト領域と
を有し、
それぞれの前記トレンチ部は、前記半導体基板の上面において、前記配列方向とは異なる延伸方向に延伸して形成されており、
前記複数のメサ部のうち、前記トランジスタ部および前記ダイオード部との境界における少なくとも1つの境界メサ部を有し、
前記複数のトレンチ部のうち、前記境界メサ部に隣接するトレンチ部よりも前記トランジスタ部側に隣接して設けられた少なくとも一つのトレンチ部が、ダミートレンチ部であり、
前記境界メサ部は、前記半導体基板の上面に前記ベース領域が露出するベース境界メサ部を有し、
前記ベース境界メサ部の前記ベース領域は、前記トランジスタ部の前記エミッタ領域が露出した前記延伸方向における位置で、前記半導体基板の上面に露出する
半導体装置。 - 前記ベース境界メサ部を複数備える
請求項1に記載の半導体装置。 - 前記ベース境界メサ部は前記ダイオード部に隣接する
請求項1または2に記載の半導体装置。 - 前記ベース境界メサ部は前記ダミートレンチ部に挟まれる
請求項1から3のいずれか一項に記載の半導体装置。 - 前記境界メサ部は、前記半導体基板の上面において前記コンタクト領域を有する高濃度境界メサ部を備え、
当該高濃度境界メサ部は前記ダミートレンチ部に挟まれ、
前記高濃度境界メサ部は、前記ベース境界メサ部と、前記トランジスタ部側の前記メサ部の間に設けられる
請求項1から4のいずれか一項に記載の半導体装置。 - 前記高濃度境界メサ部を複数備える
請求項5に記載の半導体装置。 - 前記高濃度境界メサ部の少なくとも一つは、前記半導体基板の上面に前記ベース領域が露出し、
前記露出するベース領域の面積が、前記コンタクト領域の露出する面積よりも小さい
請求項5または6に記載の半導体装置。 - 前記ベース境界メサ部の少なくとも一つは、前記半導体基板の上面に前記コンタクト領域を備え、
前記半導体基板の上面に露出する前記ベース領域の面積が、前記コンタクト領域の露出する面積よりも大きい
請求項5または6に記載の半導体装置。 - 前記ダイオード部および前記境界メサ部は、前記半導体基板の上面側にライフタイムキラーを有する
請求項5から8のいずれか一項に記載の半導体装置。 - 前記境界メサ部よりも前記トランジスタ部側の前記メサ部は、前記半導体基板の上面において、前記エミッタ領域を有し、
前記複数のトレンチ部のうち、前記境界メサ部と前記トランジスタ部のメサ部との間のトレンチ部は、前記ダミートレンチ部であり、
当該ダミートレンチ部は、前記エミッタ領域と接する
請求項5から9のいずれか一項に記載の半導体装置。 - 前記エミッタ領域と接し、前記境界メサ部と前記トランジスタ部側のメサ部との間の前記ダミートレンチ部から、前記高濃度境界メサ部と前記ベース境界メサ部との間の前記ダミートレンチ部までの距離(Dd)は、
前記高濃度境界メサ部と前記ベース境界メサ部との間の前記ダミートレンチ部から、前記ベース境界メサ部と前記ダイオード部との境界までの距離(De)よりも小さい
請求項10に記載の半導体装置。 - 前記エミッタ領域と接し、前記境界メサ部と前記トランジスタ部側のメサ部との間の前記ダミートレンチ部から、前記高濃度境界メサ部と前記ベース境界メサ部との間の前記ダミートレンチ部までの距離(Dd)は、
前記高濃度境界メサ部と前記ベース境界メサ部との間の前記ダミートレンチ部から、前記ベース境界メサ部と前記ダイオード部との境界までの距離(De)よりも大きい
請求項10に記載の半導体装置。 - 前記高濃度境界メサ部と前記ベース境界メサ部との間の前記ダミートレンチ部から、前記ベース境界メサ部と前記ダイオード部との境界までの距離(De)は、
前記ベース領域の底面から前記ライフタイムキラーの欠陥濃度のピーク位置までの距離(Dh)よりも大きい
請求項9に記載の半導体装置。 - 前記境界メサ部よりも前記トランジスタ部側の前記メサ部は、前記半導体基板の上面において、前記エミッタ領域を有し、
前記複数のトレンチ部のうち、前記境界メサ部と前記トランジスタ部のメサ部との間のトレンチ部は、前記ダミートレンチ部であり、
当該ダミートレンチ部は、前記エミッタ領域と接し、
前記エミッタ領域と接し、前記境界メサ部と前記トランジスタ部側のメサ部との間の前記ダミートレンチ部から、前記高濃度境界メサ部と前記ベース境界メサ部との間の前記ダミートレンチ部までの距離(Dd)は、
前記ベース領域の底面から前記ライフタイムキラーの欠陥濃度のピーク位置までの距離(Dh)よりも大きい
請求項9に記載の半導体装置。 - 前記ドリフト領域と前記半導体基板の下面との間に第1導電型のバッファ領域を備え、
前記エミッタ領域と接し、前記境界メサ部と前記トランジスタ部側のメサ部との間の前記ダミートレンチ部から、前記高濃度境界メサ部と前記ベース境界メサ部との間の前記ダミートレンチ部までの距離(Dd)と、
前記高濃度境界メサ部と前記ベース境界メサ部との間の前記ダミートレンチ部から、前記ベース境界メサ部と前記ダイオード部との境界までの距離(De)との和(Dd+De)は、
前記ベース領域の底面から、前記バッファ領域のドーピング濃度において、前記半導体基板の最も上面側のピーク濃度の位置までの距離(Dj)よりも大きい
請求項10に記載の半導体装置。 - 前記半導体基板の下面であって、前記トランジスタ部および前記境界メサ部の下方に、第2導電型のコレクタ領域が設けられた
請求項1から15のいずれか一項に記載の半導体装置。 - 前記半導体基板の下面であって、前記ダイオード部の下方の少なくとも一部に、第1導電型のカソード領域が設けられた
請求項16に記載の半導体装置。 - 前記半導体基板の上面に形成された層間絶縁膜を更に備え、
前記層間絶縁膜には、前記半導体基板の上面を露出させるコンタクトホールが形成され、
前記カソード領域は、前記コンタクトホールの前記延伸方向の外側の端を前記半導体基板の下面に投影した位置より、前記延伸方向に沿って内側に設けられ、
前記コンタクトホールの前記延伸方向の外側の端を前記半導体基板の下面に投影した位置には前記コレクタ領域が設けられる、
請求項17に記載の半導体装置。 - 前記ダイオード部は、前記カソード領域の前記延伸方向の外側に隣接して前記コレクタ領域を備える
請求項18に記載の半導体装置。 - 前記トランジスタ部に形成された前記メサ部の少なくとも一つには、前記ベース領域および前記ドリフト領域の間に、前記ドリフト領域よりも高濃度の第1導電型の蓄積領域が設けられる、
請求項16から19のいずれか一項に記載の半導体装置。 - 前記ダイオード部の前記コレクタ領域の、前記延伸方向に沿った内側の端部は、前記トランジスタ部の前記蓄積領域の前記延伸方向に沿った外側の端部よりも内側に位置する
請求項20に記載の半導体装置。 - 前記境界メサ部のうち少なくとも一つは、前記トランジスタ部に設けられる
請求項1から21のいずれか一項に記載の半導体装置。 - 前記トランジスタ部に設けられる複数の前記トレンチ部のうち、前記エミッタ領域に接するトレンチ部の少なくとも一部がゲートトレンチ部である
請求項10から12、または15のいずれか一項に記載の半導体装置。
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