JP7070303B2 - 半導体装置 - Google Patents
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- JP7070303B2 JP7070303B2 JP2018189414A JP2018189414A JP7070303B2 JP 7070303 B2 JP7070303 B2 JP 7070303B2 JP 2018189414 A JP2018189414 A JP 2018189414A JP 2018189414 A JP2018189414 A JP 2018189414A JP 7070303 B2 JP7070303 B2 JP 7070303B2
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- 239000004065 semiconductor Substances 0.000 title claims description 71
- 239000000758 substrate Substances 0.000 claims description 57
- 239000012535 impurity Substances 0.000 claims description 7
- 230000015556 catabolic process Effects 0.000 description 16
- 238000010438 heat treatment Methods 0.000 description 5
- JJWKPURADFRFRB-UHFFFAOYSA-N carbonyl sulfide Chemical compound O=C=S JJWKPURADFRFRB-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005224 laser annealing Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon 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
- 238000009825 accumulation Methods 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000005855 radiation Effects 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
- 230000003068 static effect Effects 0.000 description 1
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Description
本発明に係る他の半導体装置は、セル領域と前記セル領域の周囲に設けられた終端領域を有するn型半導体基板と、前記セル領域において前記n型半導体基板の上面に設けられたp型アノード層と、前記n型半導体基板の下面に設けられたn型バッファ層と、前記n型半導体基板の下面に設けられ、前記n型バッファ層よりも深さが浅いp型コレクタ層とを備え、前記終端領域の一部のみにおいて前記n型バッファ層が形成されていない領域が有り、その領域に前記p型コレクタ層が設けられていることを特徴とする。
図1は、実施の形態1に係る半導体装置を示す断面図である。n-型半導体基板1は、セル領域と、セル領域の周囲に設けられた終端領域を有する。なお、n-型半導体基板1はn型ドリフト層として機能する。
図3は、実施の形態2に係る半導体装置を示す断面図である。本実施の形態では、実施の形態1の深いp-型層13の代わりに、終端領域においてn型バッファ層10が形成されていない領域が有り、その領域にn型バッファ層10よりも浅いp型コレクタ層11が設けられている。この領域は、n型バッファ層10を形成する時に写真製版プロセス又は遮蔽マスクを使用して形成する。
図4は、実施の形態3に係る半導体装置を示す断面図である。終端領域においてもn型バッファ層10の下面にn+型カソード層12が設けられている。これにより、静耐圧測定でアバランシェブレークダウンした瞬間に2次降伏状態に移行して破壊する動作現象を抑えることができる。
図5は、実施の形態4に係る半導体装置を示す断面図である。n型バッファ層10は、セル領域のp型コレクタ層11の中央領域に向かって、不純物濃度が薄くなり、n-型半導体基板1の下面からの深さが局所的に浅くなる。これにより、p型コレクタ層11からのホールの注入効率がセル領域のp型コレクタ層11の中央領域で高くなり、周辺領域で低くなる。セル領域のp型コレクタ層11の中央領域は、順方向動作時のキャリアの蓄積が少なく、リカバリ時に空乏化しやすい。このため、中央領域のホール注入効率を高くすることでリカバリ発振耐量を向上することができる。その他、実施の形態3と同様の効果を得ることができる。
Claims (5)
- セル領域と前記セル領域の周囲に設けられた領域を有するn型半導体基板と、
前記セル領域において前記n型半導体基板の上面に設けられたp型アノード層と、
前記n型半導体基板の下面に設けられたn型バッファ層と、
前記セル領域の周囲の領域のみにおいて前記n型半導体基板の下面に設けられ、前記n型バッファ層よりも深さが深いp型層とを備えることを特徴とする半導体装置。 - セル領域と前記セル領域の周囲に設けられた終端領域を有するn型半導体基板と、
前記セル領域において前記n型半導体基板の上面に設けられたp型アノード層と、
前記n型半導体基板の下面に設けられたn型バッファ層と、
前記n型半導体基板の下面に設けられ、前記n型バッファ層よりも深さが浅いp型コレクタ層とを備え、
前記終端領域の一部のみにおいて前記n型バッファ層が形成されていない領域が有り、その領域に前記p型コレクタ層が設けられていることを特徴とする半導体装置。 - 前記n型バッファ層の下面に設けられたn型カソード層を更に備え、
前記p型コレクタ層は、前記n型カソード層よりも深さが浅く、
前記終端領域において前記n型バッファ層及び前記n型カソード層が形成されていない領域が有り、その領域に前記p型コレクタ層が設けられていることを特徴とする請求項2に記載の半導体装置。 - 前記n型バッファ層は、前記セル領域の前記p型コレクタ層の中央領域に向かって、不純物濃度が薄くなり、深さが局所的に浅くなることを特徴とする請求項2又は3に記載の半導体装置。
- 前記n型半導体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1~4の何れか1項に記載の半導体装置。
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JP2018189414A JP7070303B2 (ja) | 2018-10-04 | 2018-10-04 | 半導体装置 |
US16/441,366 US11107887B2 (en) | 2018-10-04 | 2019-06-14 | Semiconductor device |
DE102019125976.2A DE102019125976A1 (de) | 2018-10-04 | 2019-09-26 | Halbleitervorrichtung |
CN201910926528.4A CN111009571B (zh) | 2018-10-04 | 2019-09-27 | 半导体装置 |
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KR101052639B1 (ko) * | 2003-02-17 | 2011-07-28 | 파텐트-트로이한트-게젤샤프트 퓌어 엘렉트리쉐 글뤼람펜 엠베하 | 저압 방전 램프 |
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JP2018107479A (ja) | 2018-04-05 | 2018-07-05 | 三菱電機株式会社 | 半導体装置 |
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DE4240027A1 (de) * | 1992-11-28 | 1994-06-01 | Asea Brown Boveri | MOS-gesteuerte Diode |
JPH11204789A (ja) * | 1998-01-08 | 1999-07-30 | Sanken Electric Co Ltd | 絶縁ゲ−ト形トランジスタ |
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JP5309360B2 (ja) | 2008-07-31 | 2013-10-09 | 三菱電機株式会社 | 半導体装置およびその製造方法 |
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