JP7210490B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP7210490B2 JP7210490B2 JP2020006048A JP2020006048A JP7210490B2 JP 7210490 B2 JP7210490 B2 JP 7210490B2 JP 2020006048 A JP2020006048 A JP 2020006048A JP 2020006048 A JP2020006048 A JP 2020006048A JP 7210490 B2 JP7210490 B2 JP 7210490B2
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- 239000004065 semiconductor Substances 0.000 title claims description 76
- 238000009792 diffusion process Methods 0.000 claims description 212
- 239000000758 substrate Substances 0.000 claims description 67
- 238000002955 isolation Methods 0.000 claims description 56
- 239000012535 impurity Substances 0.000 claims description 28
- 230000015556 catabolic process Effects 0.000 claims description 27
- 230000007423 decrease Effects 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 description 18
- 239000002184 metal Substances 0.000 description 18
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 16
- 229920005591 polysilicon Polymers 0.000 description 16
- 230000003071 parasitic effect Effects 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 238000002513 implantation Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 230000008054 signal transmission Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 241000293849 Cordylanthus Species 0.000 description 1
- 229910002601 GaN Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000000926 separation method Methods 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
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Description
図1は、実施の形態1に係る半導体装置を示す図である。この半導体装置は、ハーフブリッジを構成するパワーチップ1,2を駆動するHVIC(High Voltage IC)3である。HVIC3は、パワーチップ1を駆動するハイサイド回路領域4と、パワーチップ2を駆動するローサイド回路領域5と、ローサイド回路領域5とハイサイド回路領域4との間の信号伝達を行うレベルシフト回路6とを有する。
図14は、実施の形態2に係る半導体装置を示す平面図である。P型拡散層39がP型拡散層12の端部とP型拡散層11との間においてP型拡散層12の端部に接するようにP型基板8の主面に形成されている。P型拡散層39の不純物濃度は、P型拡散層12よりも低く、P型基板8よりも高い。
図16は、実施の形態3に係る半導体装置を示す平面図である。実施の形態2ではP型拡散層39はローサイド側のP型拡散層11から離れていたが、本実施の形態ではP型拡散層39はローサイド側のP型拡散層11に接する
図18は、実施の形態4に係る半導体装置を示す平面図である。実施の形態1ではP型拡散層39の幅はP型拡散層12の幅と同一であったが、本実施の形態ではP型拡散層39の幅はP型拡散層12の幅よりも広い。
図20は、実施の形態5に係る半導体装置の製造工程を示す平面図である。複数のドット状の注入ウィンドウからP型基板8に不純物を注入して複数のドット40を形成する。このドット40の不純物を拡散することでP型拡散層39を形成する。
図21は、実施の形態6に係る半導体装置を示す平面図である。P型拡散層39の幅は、ハイサイド回路領域からローサイド回路領域に向かって徐々に狭くなる。これにより、実施の形態5と同様の効果を得ることができる。また、ドット状の注入ウィンドウを用いる場合に比べて簡単なレイアウト設計で実現することができる。なお、P型拡散層39のローサイド側の端部は、ローサイド回路領域のP型拡散層11の電位をGNDとしてハイサイド回路領域のN+型拡散層19,20に高電圧を印加した際に空乏化される程度の幅であり、P型拡散層11に接していてもよい。
図22は、実施の形態7に係る半導体装置を示す平面図である。実施の形態1では、N型拡散層9とN型拡散層10の間で露出したP型基板8の幅が一定であった。これに対して、本実施の形態では、当該幅がハイサイド回路領域からローサイド回路領域に向かって徐々に狭くなる。ローサイド側の幅をWL、ハイサイド側の幅をWHとするとWL<WHとなる。空乏化が必要なP型基板8の幅をローサイド回路領域に向かって狭くする。これより、ローサイド回路領域のP型拡散層11の電位をGNDとして、ハイサイド回路領域のN+型拡散層19,20に高電圧を印加した際に、P型基板8とN型拡散層9,10との間のPN接合界面からP型基板8側へ広がる空乏層がピンチオフしやすくなる。従って、更に耐圧低下を抑制することができる。
Claims (8)
- ハイサイド回路領域と、
ローサイド回路領域と、
前記ハイサイド回路領域の外周を囲い、前記ハイサイド回路領域と前記ローサイド回路領域を分離するリサーフ分離構造とを備え、
前記ハイサイド回路領域、前記ローサイド回路領域及び前記リサーフ分離構造は第1導電型の単一の半導体基板に形成され、
前記リサーフ分離構造は高耐圧分離領域と高耐圧MOSを有し、
前記高耐圧分離領域は、前記半導体基板の主面に形成された第2導電型の第1の拡散層を有し、
前記高耐圧MOSは、前記半導体基板の主面に形成された第2導電型の第2の拡散層を有し、
前記ローサイド回路領域は、前記半導体基板の主面に形成された第1導電型の第3の拡散層を有し、
前記第1の拡散層と前記第2の拡散層の間で露出した前記半導体基板の主面に前記半導体基板より不純物濃度が高い第1導電型の第4の拡散層が形成され、
前記第4の拡散層は、前記ハイサイド回路領域から前記ローサイド回路領域に向かって延び、前記第3の拡散層には接しないことを特徴とする半導体装置。 - 第1導電型の第5の拡散層が前記第4の拡散層の端部と前記第3の拡散層との間において前記第4の拡散層の端部に接するように前記半導体基板の主面に形成され、
前記第5の拡散層の不純物濃度は、前記第4の拡散層よりも低く、前記半導体基板よりも高いことを特徴とする請求項1に記載の半導体装置。 - 前記第5の拡散層は前記第3の拡散層に接することを特徴とする請求項2に記載の半導体装置。
- 前記第5の拡散層の幅は前記第4の拡散層の幅よりも広いことを特徴とする請求項2又は3に記載の半導体装置。
- 前記第5の拡散層の不純物濃度は、前記ハイサイド回路領域から前記ローサイド回路領域に向かって徐々に低くなることを特徴とする請求項2~4の何れか1項に記載の半導体装置。
- 第1導電型の第5の拡散層が前記第4の拡散層の端部と前記第3の拡散層との間で前記半導体基板の主面に形成され、
前記第5の拡散層の幅は、前記ハイサイド回路領域から前記ローサイド回路領域に向かって徐々に狭くなることを特徴とする請求項1に記載の半導体装置。 - 前記第1の拡散層と前記第2の拡散層の間で露出した前記半導体基板の幅は、前記ハイサイド回路領域から前記ローサイド回路領域に向かって徐々に狭くなることを特徴とする請求項1~6の何れか1項に記載の半導体装置。
- 前記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1~7の何れか1項に記載の半導体装置。
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WO2014054319A1 (ja) | 2012-10-02 | 2014-04-10 | 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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