JP2021044517A - 半導体装置、半導体装置の製造方法、インバータ回路、駆動装置、車両、及び、昇降機 - Google Patents
半導体装置、半導体装置の製造方法、インバータ回路、駆動装置、車両、及び、昇降機 Download PDFInfo
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 154
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- 229910052782 aluminium Inorganic materials 0.000 description 12
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Abstract
Description
第1の実施形態の半導体装置は、第1の方向及び第1の方向に直交する第2の方向に平行な第1の面と、第1の面に対向する第2の面と、を有する炭化珪素層であって、第1の面の側に位置し、第1の方向に延びる第1のトレンチと、第1の面の側に位置し、第1の方向に延びる第2のトレンチと、n型の第1の炭化珪素領域と、第1の炭化珪素領域と第1の面との間に位置し、第1のトレンチと第2のトレンチとの間に位置するp型の第2の炭化珪素領域と、第2の炭化珪素領域と第1の面との間に位置し、第1のトレンチと第2のトレンチとの間に位置するn型の第3の炭化珪素領域と、第2のトレンチと第1の炭化珪素領域との間に位置し、第2のトレンチと第2の炭化珪素領域との間に位置し、第2の炭化珪素領域よりもp型不純物濃度の高いp型の第4の炭化珪素領域と、を有する炭化珪素層と、第1のトレンチの中に位置するゲート電極と、ゲート電極と炭化珪素層との間に位置するゲート絶縁層と、炭化珪素層の第1の面の側に位置し、一部が第2のトレンチの中に位置し、一部が第3の炭化珪素領域及び第4の炭化珪素領域と接する第1の電極と、炭化珪素層の第2の面の側に位置する第2の電極と、ゲート電極と第1の電極との間に位置する層間絶縁層と、を備え、第1の電極と層間絶縁層との界面が、第1の面よりも第2の面の側に位置する。
電界緩和領域32は、コンタクトトレンチ22の側面に接する。
第2の実施形態の半導体装置の製造方法は、第2の炭化珪素領域を形成した後に、第1のトレンチを形成する点で、第1の実施形態の半導体装置の製造方法と異なる。以下、第1の実施形態と重複する内容については、一部記述を省略する。
第3の実施形態の半導体装置は、第1のトレンチと第1の炭化珪素領域との間に位置するp型の第5の炭化珪素領域を、更に備える点で第1の実施形態の半導体装置と異なる。以下、第1の実施形態と重複する内容については、一部記述を省略する。
第4の実施形態の半導体装置は、第1のトレンチの第2の方向の幅は、第2のトレンチの第2の方向の幅よりも小さい点で、第1の実施形態の半導体装置と異なる。また、第2の面から第1のトレンチまでの距離が、第2の面から第2のトレンチまでの距離よりも大きい点で、第1の実施形態の半導体装置と異なる。以下、第1の実施形態と重複する内容については、一部記述を省略する。
第5の実施形態のインバータ回路及び駆動装置は、第1の実施形態の半導体装置を備える駆動装置である。
第6の実施形態の車両は、第1の実施形態の半導体装置を備える車両である。
第7の実施形態の車両は、第1の実施形態の半導体装置を備える車両である。
第8の実施形態の昇降機は、第1の実施形態の半導体装置を備える昇降機である。
12 ソース電極(第1の電極)
12a コンタクト領域(一部)
14 ドレイン電極(第2の電極)
16 ゲート電極
18 ゲート絶縁層
20 層間絶縁層
21 ゲートトレンチ(第1のトレンチ)
22 コンタクトトレンチ(第2のトレンチ)
26 ドリフト領域(第1の炭化珪素領域)
28 ボディ領域(第2の炭化珪素領域)
30 ソース領域(第3の炭化珪素領域)
32 電界緩和領域(第4の炭化珪素領域)
34 ゲートトレンチ底部領域(第5の炭化珪素領域)
100 MOSFET(半導体装置)
150 インバータ回路
200 MOSFET(半導体装置)
300 MOSFET(半導体装置)
1000 駆動装置
1100 車両
1200 車両
1300 昇降機
K0 界面
K1 第1の境界
K2 第2の境界
P1 第1の面
P2 第2の面
d1 第1の距離
d2 第2の距離
d3 第3の距離
θ1 第1の角度
θ2 第2の角度
Claims (16)
- 第1の方向及び前記第1の方向に直交する第2の方向に平行な第1の面と、前記第1の面に対向する第2の面と、を有する炭化珪素層であって、
前記第1の面の側に位置し、前記第1の方向に延びる第1のトレンチと、
前記第1の面の側に位置し、前記第1の方向に延びる第2のトレンチと、
n型の第1の炭化珪素領域と、
前記第1の炭化珪素領域と前記第1の面との間に位置し、前記第1のトレンチと前記第2のトレンチとの間に位置するp型の第2の炭化珪素領域と、
前記第2の炭化珪素領域と前記第1の面との間に位置し、前記第1のトレンチと前記第2のトレンチとの間に位置するn型の第3の炭化珪素領域と、
前記第2のトレンチと前記第1の炭化珪素領域との間に位置し、前記第2のトレンチと前記第2の炭化珪素領域との間に位置し、前記第2の炭化珪素領域よりもp型不純物濃度の高いp型の第4の炭化珪素領域と、
を有する炭化珪素層と、
前記第1のトレンチの中に位置するゲート電極と、
前記ゲート電極と前記炭化珪素層との間に位置するゲート絶縁層と、
前記炭化珪素層の前記第1の面の側に位置し、一部が前記第2のトレンチの中に位置し、前記一部が前記第3の炭化珪素領域及び前記第4の炭化珪素領域と接する第1の電極と、
前記炭化珪素層の前記第2の面の側に位置する第2の電極と、
前記ゲート電極と前記第1の電極との間に位置する層間絶縁層と、
を備え、
前記第1の電極と前記層間絶縁層との界面が、前記第1の面よりも前記第2の面の側に位置する半導体装置。 - 前記第2の炭化珪素領域と前記第3の炭化珪素領域との間の境界を第1の境界、
前記第1の面から前記第1の境界までの距離を第1の距離、
前記第1の炭化珪素領域と前記第2の炭化珪素領域との間の境界を第2の境界、
前記第1の境界から前記第2の境界までの距離を第2の距離、とした場合に、
前記第1の距離が一定であり、
前記ゲート絶縁層に沿った前記第1の距離が、前記ゲート絶縁層に沿った前記第2の距離よりも大きい請求項1記載の半導体装置。 - 前記第1の炭化珪素領域と前記第2の炭化珪素領域との間の境界を第2の境界、
前記第1の面から前記第2の境界までの距離を第3の距離、とした場合に、
前記第3の距離が前記第1のトレンチから前記第2のトレンチに向かって大きくなる請求項1又は請求項2記載の半導体装置。 - 前記第2の炭化珪素領域のp型不純物の前記第2の方向の不純物濃度分布が前記第1のトレンチと前記第2のトレンチとの間で濃度ピークを有する請求項1ないし請求項3いずれか一項記載の半導体装置。
- 前記第1のトレンチと前記第2のトレンチとの間の距離は、前記第1のトレンチの前記第2の方向の幅よりも小さい請求項1ないし請求項4いずれか一項記載の半導体装置。
- 前記第2の面から前記第1のトレンチまでの距離と、前記第2の面から前記第2のトレンチまでの距離は等しい請求項1ないし請求項5いずれか一項記載の半導体装置。
- 前記第1のトレンチと前記第1の炭化珪素領域との間に位置するp型の第5の炭化珪素領域を、更に備える請求項1ないし請求項6いずれか一項記載の半導体装置。
- 前記第1のトレンチの前記第2の方向の幅は、前記第2のトレンチの前記第2の方向の幅よりも小さい請求項1ないし請求項7いずれか一項記載の半導体装置。
- 請求項1ないし請求項8いずれか一項記載の半導体装置を備えるインバータ回路。
- 請求項1ないし請求項8いずれか一項記載の半導体装置を備える駆動装置。
- 請求項1ないし請求項8いずれか一項記載の半導体装置を備える車両。
- 請求項1ないし請求項8いずれか一項記載の半導体装置を備える昇降機。
- 第1の面と、前記第1の面に対向する第2の面と、前記第2の面と前記第1の面との間に位置するn型の第1の炭化珪素領域を有する炭化珪素層の前記第1の面の側に、第1のトレンチを形成し、
前記炭化珪素層の前記第1の面の側に、第2のトレンチを形成し、
前記第2のトレンチに、前記第1の面の法線に対して第1の角度で傾く方向でp型不純物をイオン注入し、p型の第2の炭化珪素領域を形成し、
前記第1のトレンチの中にゲート絶縁層を形成し、
前記第1のトレンチの中の前記ゲート絶縁層の上にゲート電極を形成し、
前記ゲート電極の上に、絶縁膜を形成し、
前記第1のトレンチの中の前記絶縁膜の上面が前記第1の面よりも下がるように前記絶縁膜をエッチングし、
前記第2のトレンチの中、及び、前記絶縁膜の上に電極を形成する半導体装置の製造方法であって、
前記第1のトレンチの側面に前記第2の炭化珪素領域が接する半導体装置の製造方法。 - 前記第2の炭化珪素領域を形成した後に、前記第1のトレンチを形成する請求項13記載の半導体装置の製造方法。
- 前記第2の炭化珪素領域を形成する前に、前記炭化珪素層の前記第1の面の側に前記第2の炭化珪素領域よりも浅い、n形の第3の炭化珪素領域を、更に形成する請求項13又は請求項14記載の半導体装置の製造方法。
- 前記第2のトレンチに、前記第1の面の法線に対して前記第1の角度よりも小さい第2の角度で傾く方向でp型不純物をイオン注入し、前記第2の炭化珪素領域よりもp型不純物濃度の高いp型の第4の炭化珪素領域を、更に形成する請求項13ないし請求項15いずれか一項記載の半導体装置の製造方法。
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