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放射光光電子分光を用いたAl/Ti/n-GaNオーミック接合の界面反応分析

Synchrotron radiation X-ray photoelectron spectroscopy study of interface reactions in Al/Ti/GaN Ohmic contacts

野崎 幹人*; 吉越 章隆; 伊藤 丈予*; 淺原 亮平*; 中澤 敏志*; 石田 昌宏*; 上田 哲三*; 細井 卓治*; 志村 考功*; 渡部 平司*

Nozaki, Mikito*; Yoshigoe, Akitaka; Ito, Joyo*; Asahara, Ryohei*; Nakazawa, Satoshi*; Ishida, Masahiro*; Ueda, Tetsuzo*; Hosoi, Takuji*; Shimura, Takayoshi*; Watanabe, Heiji*

Ti単層およびAl/Ti積層構造をn-GaN上に形成し、放射光光電子分光分析によりTi/GaN接合界面の構造変化を調べた。Alキャップ層は酸素バリア層として働くだけでなく、Ti中の酸素を取り込むことで界面反応を促進し、室温においてもTi/GaN界面構造を顕著に変化させることを明らかにした。

Structural changes at Ti/GaN or Al/Ti/GaN interfaces were studied by using synchrotron radiation photoelectron spectroscopy. It was found that the Al capping layer plays an important role for oxygen diffusion barriers. The Al layer also stimulates interfacial reactions via introducing oxygen into Ti layers. We found that this reaction dramatically changes Ti/GaN interface structures.

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