JP6995187B2 - パワーmosfetデバイス - Google Patents
パワーmosfetデバイス Download PDFInfo
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- JP6995187B2 JP6995187B2 JP2020510097A JP2020510097A JP6995187B2 JP 6995187 B2 JP6995187 B2 JP 6995187B2 JP 2020510097 A JP2020510097 A JP 2020510097A JP 2020510097 A JP2020510097 A JP 2020510097A JP 6995187 B2 JP6995187 B2 JP 6995187B2
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- 229910052710 silicon Inorganic materials 0.000 claims description 14
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Description
Claims (11)
- ソースと、ドレインと、第1のゲートと、第2のゲートと、ボディダイオードと、ボディコンタクトダイオードとを含み、前記ソースと、ドレインと、第1のゲートとは、第1のMOSFET構造に構成され、前記ソースと、ドレインと、第2のゲートとは、第2のMOSFET構造に構成され、前記ボディダイオードの陰極は前記ドレインに接続され、前記ボディコンタクトダイオードの陽極は前記ボディダイオードの陽極に接続され、前記ボディコンタクトダイオードの陰極は前記ソースに接続され、前記第1のゲートはゲート電圧によって前記第1のMOSFET構造のオン/オフを制御し、前記第2のゲートは前記ソースに接続され、前記第2のゲートはソース電圧によって前記第2のMOSFET構造のオン/オフを制御する、パワー金属酸化物半導体型電界効果トランジスタ(MOSFET)デバイス。
- 前記第1のMOSFET構造の閾値電圧は前記第2のMOSFET構造の閾値電圧よりも大きい、請求項1に記載のパワーMOSFETデバイス。
- n型ドレイン領域と前記n型ドレイン領域の上に位置するn型ドリフト領域であって、前記n型ドリフト領域内にp型ボディ領域が設けられ、前記p型ボディ領域内に、p型ボディコンタクト領域と第1のn型ソース領域と第2のn型ソース領域とが設けられている、n型ドリフト領域と、
前記p型ボディコンタクト領域の上に位置する導電層であって、前記導電層と前記p型ボディコンタクト領域とが前記ボディコンタクトダイオードを形成し、前記導電層は前記ボディコンタクトダイオードの陰極であり、前記p型ボディコンタクト領域は前記ボディコンタクトダイオードの陽極である、導電層と、
前記p型ボディ領域内に位置し、且つ前記第1のn型ソース領域と前記n型ドリフト領域との間に介在する第1の電流チャネルであって、
前記第1のゲートとゲート誘電体層とが前記第1の電流チャネルを被覆し、前記第1のゲートはゲート電圧によって前記第1の電流チャネルのオン/オフを制御するように構成される、第1の電流チャネルと、
前記p型ボディ領域内に位置し、且つ前記第2のn型ソース領域と前記n型ドリフト領域との間に介在する第2の電流チャネルであって、前記第2のゲートと前記ゲート誘電体層とが前記第2の電流チャネルを被覆し、前記第2のゲートと前記第1のn型ソース領域と前記第2のn型ソース領域と前記導電層との間は互いに電気的に接続され、且ついずれもソース電圧に接続され、前記第2のゲートはソース電圧によって前記第2の電流チャネルのオン/オフを制御するように構成される、第2の電流チャネルと、
を含む、請求項1に記載のパワーMOSFETデバイス。 - 前記導電層は前記p型ボディ領域の上に位置するソース金属コンタクト層であり、前記p型ボディコンタクト領域のドーピング濃度は、前記p型ボディ領域のドーピング濃度の最大ピークよりも低く、前記p型ボディコンタクト領域と前記ソース金属コンタクト層とは、ショットキーバリアダイオード構造を形成する、請求項3に記載のパワーMOSFETデバイス。
- 前記第2のゲートは前記ソース金属コンタクト層によって前記第1のn型ソース領域と前記第2のn型ソース領域と接続され、前記ソース金属コンタクト層はソース電圧に外部接続されている、請求項4に記載のパワーMOSFETデバイス。
- 前記導電層は前記p型ボディ領域の上に位置するn型ポリシリコン層であり、前記n型ポリシリコン層と前記p型ボディコンタクト領域とは、シリコンベースのボディコンタクトダイオード構造を形成する、請求項3に記載のパワーMOSFETデバイス。
- 前記n型ポリシリコン層は前記第2のゲートと、前記第1のn型ソース領域と、前記第2のn型ソース領域と直接接続され、前記n型ポリシリコン層はソース金属コンタクト層によってソース電圧に外部接続されている、請求項6に記載のパワーMOSFETデバイス。
- 前記導電層は前記p型ボディ領域内に位置するn型ドープ領域であり、前記n型ドープ領域と前記p型ボディコンタクト領域とは、シリコンベースのボディコンタクトダイオード構造を形成する、請求項3に記載のパワーMOSFETデバイス。
- 前記第2のゲートはソース金属コンタクト層によって前記第1のn型ソース領域と、前記第2のn型ソース領域と、前記n型ドープ領域と接続され、前記ソース金属コンタクト層はソース電圧に外部接続されている、請求項8に記載のパワーMOSFETデバイス。
- 前記第1の電流チャネルのオン電圧は前記第2の電流チャネルのオン電圧よりも大きい、請求項3に記載のパワーMOSFETデバイス。
- p型ボディ領域の下方に位置するp型柱状エピタキシャルドープ領域を更に含み、前記p型柱状エピタキシャルドープ領域のドープ不純物と、隣接する前記n型ドリフト領域内のドープ不純物とは、スーパージャンクション構造を形成するように電荷バランスを形成する、請求項3に記載のパワーMOSFETデバイス。
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