Silver photo-diffusion and photo-induced macroscopic surface deformation of GeS/Ag/Si substrate

GeS/Ag/Siにおける銀の光拡散と表面変形

坂口 佳史*; 朝岡 秀人  ; 魚住 雄輝; 近藤 啓悦  ; 山崎 大  ; 曽山 和彦  ; Ailavajhala, M.*; Mitkova, M.*

Sakaguchi, Yoshifumi*; Asaoka, Hidehito; Uozumi, Yuki; Kondo, Keietsu; Yamazaki, Dai; Soyama, Kazuhiko; Ailavajhala, M.*; Mitkova, M.*

Ge-chalcogenide films show various photo-induced changes, and silver photo-diffusion is one of them which attracts lots of interest. In this paper, we report how silver and Ge-chalcogenide layers in GeS/Ag/Si substrate stacks change under light exposure in the depth by measuring time-resolved neutron reflectivity. It was found from the measurement that Ag ions diffuse all over the matrix GeS layer once Ag dissolves into the layer. We also found that the surface was macro-scopically deformed by the extended light exposure. Its structural origin was investigated by a scanning electron microscopy.