The photoemission characteristics of a NEA InGaN photocathode by simultaneously supplying Cs and O2

Masahiro Kashima, Yuya Itokawa, Toshiya Kanai,Daiki Sato,Atsushi Koizumi,Hokuto Iijima,Tomohiro Nishitani,Yoshio Honda,Hiroshi Amano,Takashi Meguro

Applied Surface Science（2022）

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摘要

•The NEA activation of InGaN by simultaneously supplying Cs and O2 is more effective to obtain a high quantum efficiency than the conventional yo-yo method.•The Cs oxide species, which is one of the key compounds for imparting the NEA nature, decomposes at approximately 350 °C.•We suggest that the InGaN-Cs2O2 structure is a possible candidate for NEA photocathodes.

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关键词

Negative electron affinity surface,NEA activation,NEA photocathode,InGaN,Temperature desorption programmed method

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