JP7367440B2 - 高電子移動度トランジスタの製造方法及び高電子移動度トランジスタ - Google Patents
高電子移動度トランジスタの製造方法及び高電子移動度トランジスタ Download PDFInfo
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Description
最初に、本開示の実施形態を列記して説明する。一実施形態に係るHEMTの製造方法は、窒化物半導体によって構成されバリア層を含む半導体積層の表面上に、第1SiN膜を、成膜炉の炉内温度を700℃以上900℃以下の第1の温度に設定した状態で減圧CVD法により形成する第1工程と、成膜炉内を真空引きして炉内圧力を1Pa以下とし、且つ成膜炉の炉内温度を700℃以上900℃以下の第2の温度に設定した状態で成膜炉内の水分および酸素により第1SiN膜上に界面酸化層を形成する第2工程と、第2SiN膜を、成膜炉の炉内温度を700℃以上900℃以下の第3の温度に設定した状態で減圧CVD法により界面酸化層上に形成する第3工程とを含む。
本開示のHEMTの製造方法及びHEMTの具体例を、以下に図面を参照しつつ説明する。なお、本開示はこれらの例示に限定されるものではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。以下の説明では、図面の説明において同一の要素には同一の符号を付し、重複する説明を省略する。
Claims (6)
- 窒化物半導体によって構成されバリア層を含む半導体積層の表面上に、第1SiN膜を、成膜炉の炉内温度を700℃以上900℃以下の第1の温度に設定した状態で減圧CVD法により形成する第1工程と、
前記成膜炉内を真空引きして炉内圧力を1Pa以下とし、且つ前記成膜炉の炉内温度を700℃以上900℃以下の第2の温度に設定した状態で前記成膜炉内の水分および酸素により前記第1SiN膜上に界面酸化層を1nm以下の厚さに形成する第2工程と、
第2SiN膜を、前記成膜炉の炉内温度を700℃以上900℃以下の第3の温度に設定した状態で減圧CVD法により前記界面酸化層上に形成する第3工程と、
を含む、高電子移動度トランジスタの製造方法。 - 前記第2工程は、前記成膜炉内を真空引きして炉内圧力を1Pa以下とし、且つ前記成膜炉の炉内温度を700℃以上900℃以下の第2の温度に設定した状態で、少なくとも30秒間継続される、請求項1に記載の高電子移動度トランジスタの製造方法。
- 前記第1工程及び前記第3工程では、シリコン原料としてのジクロロシランガスの流量と、窒素原料としてのアンモニアガスの流量との比率を1:1に設定する、請求項1または請求項2に記載の高電子移動度トランジスタの製造方法。
- 前記第2の温度及び前記第3の温度を前記第1の温度と等しくする、請求項1から請求項3のいずれか1項に記載の高電子移動度トランジスタの製造方法。
- 窒化物半導体によって構成されバリア層を含む半導体積層と、
前記半導体積層の表面上に設けられた第1SiN膜、及び前記第1SiN膜上に設けられた第2SiN膜を含む表面保護膜とを備え、
前記表面保護膜は、前記第1SiN膜と前記第2SiN膜との間に界面酸化層を更に含み、前記界面酸化層は、5×1021cm-3を超える酸素原子、及び1×1020cm-3を超える塩素原子を含み、1nm以下の厚さを有する、高電子移動度トランジスタ。 - 前記第1SiN膜及び前記第2SiN膜は1×1020cm-3を超える塩素原子を含む、請求項5に記載の高電子移動度トランジスタ。
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