JP2021153167A - 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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Abstract
Description
第1の実施形態の半導体装置は、炭化珪素層と、酸化シリコン層と、炭化珪素層と酸化シリコン層との間に位置し、窒素の濃度が1×1021cm−3以上の領域と、を備え、炭化珪素層、酸化シリコン層、及び、領域の中の窒素の濃度分布が、上記領域にピークを有し、ピークから酸化シリコン層の側に1nm離れた位置における窒素の濃度が1×1018cm−3以下であり、上記位置における炭素の濃度が1×1018cm−3以下である。
C+CO2→2CO ・・・(1)
第2の実施形態の半導体装置の製造方法は、酸化シリコン膜は、酸素ガス、又は、水蒸気と、二酸化炭素ガスとを含む雰囲気で、熱酸化により形成する点で、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。
C+CO2→2CO ・・・(1)
第3の実施形態の半導体装置の製造方法は、酸化シリコン膜は、窒素酸化物ガスと二酸化炭素ガスとを含む雰囲気で、熱酸化により形成する点、及び、第1の熱処理を含まないで、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。
C+CO2→2CO ・・・(1)
第4の実施形態の半導体装置の製造方法は、第1の熱処理の前に、窒素酸化物ガスを含む雰囲気中で、1050℃以上1450℃以下の温度で第2の熱処理を更に行う点、及び、第1の熱処理が、酸素ガス又は水蒸気と、二酸化炭素ガスとを含む雰囲気で行われる点で、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。
C+CO2→2CO ・・・(1)
SiO2+CO→Vo:SiO2+CO2 ・・・(2)
第5の実施形態の半導体装置の製造方法は、第1の熱処理が、窒素酸化物ガスと二酸化炭素ガスとを含む雰囲気で行われる点で、第4の実施形態の半導体装置の製造方法と異なる。以下、第4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。
C+CO2→2CO ・・・(1)
SiO2+CO→Vo:SiO2+CO2 ・・・(2)
第6の実施形態の半導体装置の製造方法は、第1の熱処理が酸素ガス、又は、水蒸気と、二酸化炭素ガスとを含む雰囲気で行われる点で、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。
C+CO2→2CO ・・・(1)
第7の実施形態の半導体装置は、トレンチ内にゲート電極を備えるトレンチゲート型のMOSFETである点で、第1の実施形態と異なっている。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8の実施形態の半導体装置は、MOSFETの終端領域にゲート絶縁層が存在する点で第1の実施形態と異なっている。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9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インバータ回路及び駆動装置である。
第10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11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12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。
28 ゲート絶縁層(酸化シリコン層)
30 ゲート電極
40 界面終端領域(領域)
100 MOSFET(半導体装置)
200 MOSFET(半導体装置)
300 MOSFET(半導体装置)
700 駆動装置
800 車両
900 車両
1000 昇降機
Claims (25)
- 炭化珪素層と、
酸化シリコン層と、
前記炭化珪素層と前記酸化シリコン層との間に位置し、窒素の濃度が1×1021cm−3以上の領域と、を備え、
前記炭化珪素層、前記酸化シリコン層、及び、前記領域の中の窒素の濃度分布が、前記領域にピークを有し、
前記ピークから前記酸化シリコン層の側に1nm離れた位置における窒素の濃度が1×1018cm−3以下であり、
前記位置における炭素の濃度が1×1018cm−3以下である半導体装置。 - 前記ピークの窒素の濃度は1×1022cm−3以上である請求項1記載の半導体装置。
- 酸素原子に結合する炭素原子と、前記酸素原子に結合する窒素原子とを含む複合体の前記位置における濃度が1×1018cm−3以下である請求項1又は請求項2記載の半導体装置。
- 前記炭化珪素層との間に前記酸化シリコン層を挟むゲート電極を、更に備える請求項1ないし請求項3いずれか一項記載の半導体装置。
- 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を備えるインバータ回路。
- 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を備える駆動装置。
- 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を備える車両。
- 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を備える昇降機。
- 炭化珪素層の表面に酸化シリコン膜を形成し、
窒素酸化物ガス、酸素ガス、及び、水蒸気からなる群から選ばれる少なくとも一つの酸化性ガスと、二酸化炭素ガスとを含む雰囲気で、第1の熱処理を行う半導体装置の製造方法。 - 前記酸化シリコン膜は気相成長により形成する請求項9記載の半導体装置の製造方法。
- 前記第1の熱処理は、窒素酸化物ガスと二酸化炭素ガスとを含む雰囲気で、1050℃以上1450℃以下の温度で行う請求項10記載の半導体装置の製造方法。
- 前記第1の熱処理は、酸素ガス又は水蒸気と、二酸化炭素ガスとを含む雰囲気で、1050℃以上1450℃以下の温度で行う請求項10記載の半導体装置の製造方法。
- 前記第1の熱処理の前に、窒素酸化物ガスを含む雰囲気で、1050℃以上1450℃以下の温度で第2の熱処理を更に行い、
前記第1の熱処理は750℃以上1050℃未満の温度で行う請求項10記載の半導体装置の製造方法。 - 前記第1の熱処理は、窒素酸化物ガスと二酸化炭素ガスとを含む雰囲気で行う請求項13記載の半導体装置の製造方法。
- 前記酸化シリコン膜は、酸素ガスと二酸化炭素ガスとを含む雰囲気で、熱酸化により形成し、
前記第1の熱処理は、窒素酸化物ガスと二酸化炭素ガスとを含む雰囲気で、1050℃以上1450℃以下の温度で行う請求項9記載の半導体装置の製造方法。 - 前記第1の熱処理の前記雰囲気の二酸化炭素ガスの分圧は10%以上である請求項9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。
- 前記第1の熱処理の前記雰囲気の酸化性ガスの分圧は10%以上である請求項9ないし請求項16いずれか一項記載の半導体装置の製造方法。
- 前記酸化シリコン膜の厚さは30nm以上100nm以下である請求項9ないし請求項17いずれか一項記載の半導体装置の製造方法。
- 前記酸化シリコン膜の上にゲート電極を更に形成する請求項9ないし請求項18いずれか一項記載の半導体装置の製造方法。
- 炭化珪素層の表面に、窒素酸化物ガス、酸素ガス、及び、水蒸気からなる群から選ばれる少なくとも一つの酸化性ガスと、二酸化炭素ガスとを含む雰囲気で、熱酸化により酸化シリコン膜を形成する半導体装置の製造方法。
- 前記熱酸化は、窒素酸化物ガスと二酸化炭素ガスとを含む雰囲気で、1050℃以上1450℃以下の温度で行う請求項20記載の半導体装置の製造方法。
- 前記雰囲気の二酸化炭素ガスの分圧は10%以上である請求項20又は請求項21記載の半導体装置の製造方法。
- 前記雰囲気の酸化性ガスの分圧は10%以上である請求項20ないし請求項22いずれか一項記載の半導体装置の製造方法。
- 前記酸化シリコン膜の厚さは30nm以上100nm以下である請求項20ないし請求項23いずれか一項記載の半導体装置の製造方法。
- 前記酸化シリコン膜の上にゲート電極を更に形成する請求項20ないし請求項24いずれか一項記載の半導体装置の製造方法。
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