JP2021141094A - 半導体装置及び半導体装置の製造方法 - Google Patents
半導体装置及び半導体装置の製造方法 Download PDFInfo
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Abstract
Description
以下、本実施の形態1に係る半導体装置がIGBT(Insulated Gate Bipolar Transistor)である例を説明する。
以下、本実施の形態1に係る半導体装置の製造方法について説明する。まず、おもて面と裏面(主面)とを有する半導体基板を準備し、当該半導体基板のおもて面側の部分におもて面構造を形成する。なお、おもて面構造の製造方法は、通常のIGBTの製造方法と同様であるため、その説明は省略する。
以上のような本実施の形態1に係る半導体装置によれば、プロトンを注入する加速電圧の変更回数を1回にすることができ、2段階の加速電圧によってバッファ層を形成することができる。このため、加速電圧の変更回数が2回である従来の製造工程と比較して、加速電圧の変更に要する時間を半分程度に短縮することができるので、イオン注入機を用いた生産性を向上させることができる。
図25は、本実施の形態2に係る半導体装置の主要な構造を示す断面図である。実施の形態1に係る半導体装置はIGBTであったが、本実施の形態2に係る半導体装置はダイオードである。
以上のような本実施の形態2に係る半導体装置は、実施の形態1の第1バッファ層8及び第2バッファ層9と実質的に同じである第1バッファ層24及び第2バッファ層25を有する。このため、実施の形態1と同様にイオン注入機を用いた生産性を向上させることができ、かつ、プロトンバッファ層で期待される、ターンオフ時のサージ電圧の抑制を実現することができる。
図25のダイオードにはトレンチが設けられていない。しかしながら、本開示に係る半導体装置は、IGBTのトレンチと同様にアノード層22を貫通してドリフト層21に到達するトレンチが形成され、トレンチの内部に絶縁膜を介してダミーゲート電極が形成されたダイオードであってもよい。また、本開示に係る半導体装置は、アノード層22にPN接合ダイオードとショットキーバリアダイオードとを組み合わせたMPS(Merged PiN Schottky)構造を有するMPSダイオードであってもよい。
Claims (16)
- 主面を有する半導体基板を備え、
前記半導体基板は、
N型のドリフト層と、
前記ドリフト層の前記主面側に前記ドリフト層と隣接して配設され、プロトンをN型不純物として含むN型の第1バッファ層と、
前記第1バッファ層の前記主面側に前記第1バッファ層と隣接して配設され、プロトンと異なるN型不純物を含むN型の第2バッファ層と
を含み、
前記第1バッファ層は、
前記主面から前記半導体基板の厚み方向に位置し、N型不純物濃度の第1ピークを有する第1部分と、
前記主面から前記第1部分よりも遠くに位置し、N型不純物濃度の第2ピークを有する第2部分と
を含み、
前記主面と前記第1部分との間の距離は4.0μm以下であり、
前記第1部分と前記第2部分との間の距離は14.5μm以上であり、
前記第1部分と前記第2部分との間の部分のN型不純物濃度は、前記ドリフト層のN型不純物濃度よりも高い、半導体装置。 - 請求項1に記載の半導体装置であって、
前記第2バッファ層の前記N型不純物はリンを含む、半導体装置。 - 請求項1または請求項2に記載の半導体装置であって、
前記第1ピークは、前記第2ピークよりも高い、半導体装置。 - 請求項3に記載の半導体装置であって、
前記第2バッファ層のN型不純物濃度のピークは、前記第1ピークよりも高い、半導体装置。 - 請求項1から請求項4のうちのいずれか1項に記載の半導体装置であって、
前記第1ピークの半値幅は、前記第2ピークの半値幅よりも小さく、
前記第2バッファ層のN型不純物濃度のピークの半値幅は、前記第1ピークの半値幅よりも小さい、半導体装置。 - 請求項1から請求項4のうちのいずれか1項に記載の半導体装置であって、
前記ドリフト層の比抵抗は、50Ω・cm以上67Ω・cm以下であり、
前記ドリフト層の厚み、前記第1バッファ層の厚み、及び、前記第2バッファ層の厚みの合計は、110μm以上130μm以下である、半導体装置。 - 請求項1から請求項4のうちのいずれか1項に記載の半導体装置であって、
前記ドリフト層の比抵抗は、90Ω・cm以上130Ω・cm以下であり、
前記ドリフト層の厚み、前記第1バッファ層の厚み、及び、前記第2バッファ層の厚みの合計は、170μm以上210μm以下である、半導体装置。 - 請求項1から請求項4のうちのいずれか1項に記載の半導体装置であって、
前記ドリフト層の比抵抗は、130Ω・cm以上180Ω・cm以下であり、
前記ドリフト層の厚み、前記第1バッファ層の厚み、及び、前記第2バッファ層の厚みの合計は、200μm以上260μm以下である、半導体装置。 - 請求項1から請求項4のうちのいずれか1項に記載の半導体装置であって、
前記ドリフト層の比抵抗は、200Ω・cm以上300Ω・cm以下であり、
前記ドリフト層の厚み、前記第1バッファ層の厚み、及び、前記第2バッファ層の厚みの合計は、340μm以上420μm以下である、半導体装置。 - 請求項1から請求項4のうちのいずれか1項に記載の半導体装置であって、
前記ドリフト層の比抵抗は、300Ω・cm以上400Ω・cm以下であり、
前記ドリフト層の厚み、前記第1バッファ層の厚み、及び、前記第2バッファ層の厚みの合計は、420μm以上520μm以下である、半導体装置。 - 請求項1から請求項4のうちのいずれか1項に記載の半導体装置であって、
前記ドリフト層の比抵抗は、600Ω・cm以上800Ω・cm以下であり、
前記ドリフト層の厚み、前記第1バッファ層の厚み、及び、前記第2バッファ層の厚みの合計は、580μm以上720μm以下である、半導体装置。 - 主面を有するN型の半導体基板を準備する工程と、
前記半導体基板の前記主面からプロトンをN型不純物として2つの加速電圧で注入することによって、前記半導体基板の前記主面側の第1面部分にN型の第1不純物層を形成する工程と
を備え、
前記第1不純物層は、
前記主面から前記半導体基板の厚み方向に位置し、N型不純物濃度の第1ピークを有する第1部分と、
前記主面から前記第1部分よりも遠くに位置し、N型不純物濃度の第2ピークを有する第2部分と
を含み、
前記主面と前記第1部分との間の距離は4.0μm以下であり、
前記第1部分と前記第2部分との間の距離は14.5μm以上であり、
アニールでプロトンを活性化することにより、前記第1部分と前記第2部分との間の部分のN型不純物濃度を、前記半導体基板のN型不純物濃度よりも高くして、前記第1不純物層から第1バッファ層を形成する第1活性化を行う工程と、
前記半導体基板の前記主面からプロトンと異なるN型不純物を注入することによって、前記半導体基板の前記第1面部分よりも浅い前記主面側の第2面部分にN型の第2不純物層を形成する工程と、
アニールで前記第2不純物層の前記N型不純物を活性化することにより、前記第2不純物層から第2バッファ層を形成する第2活性化を行う工程と
を備える、半導体装置の製造方法。 - 請求項12に記載の半導体装置の製造方法であって、
前記第2不純物層の前記N型不純物の活性化率は、プロトンの活性化率よりも高い、半導体装置の製造方法。 - 請求項12または請求項13に記載の半導体装置の製造方法であって、
前記第1活性化の工程にて、
アニール温度が340℃以上、アニール時間が120分以上である、半導体装置の製造方法。 - 請求項12または請求項13に記載の半導体装置の製造方法であって、
前記第1活性化の工程にて、
アニール温度が400℃以上、アニール時間が20分以上である、半導体装置の製造方法。 - 請求項12または請求項13に記載の半導体装置の製造方法であって、
前記第1活性化の工程にて、
x℃をアニール温度、y分をアニール時間とした場合に、340≦x≦400が成り立つ範囲で、y≧−1.6667x+686.67が満たされる、半導体装置の製造方法。
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