Processes of silver photodiffusion into Ge‐chalcogenide probed by neutron reflectivity technique
Abstract
We performed time‐resolved neutron reflectivity measurement for stacks of Ag 500 Å/Ge25S75 1500 Å/Si substrate and Ge33S67 1500 Å/Ag 500 Å/Si substrate to clarify silver photodiffusion process into Ge‐chalcogenide layer. For Ag 500 Å/Ge25S75 1500 Å/Si substrate stack, it was found that the silver layer dissolves into Ge‐chalcogenide layer within 2 min by the light exposure, and Ag‐doped reaction layer forms. However, two‐layer structure with thicknesses of 800 and 1100 Å was established by a prolonged light exposure for 70 min and it did not change to form one homogeneous layer. For Ge33S67 1500 Å/Ag 500 Å/Si substrate stack, silver rapidly dissolves into Ge33S67layer leaving a thin silver layer in the first 2 min, and then, silver slowly dissolves from the silver layer as the next reaction process. At approximately 25 min light exposure, an anomalous decrease in the neutron reflectivity, suggesting a formation of macroscopic surface roughness, was observed.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 22, 2016
- Source ID
- 10.1002/pssa.201533037
Entities
People
- Dai Yamazaki
- Gaurav Sheoran
- Hidehito Asaoka
- Kazuhiko Soyama
- Maria Mitkova
- Masato Kubota
- Takayoshi Ito
- Yoshifumi Sakaguchi
- Yuki Uozumi
- Yukinobu Kawakita
Organizations
- Boise State University
- Comprehensive Research Organization for Science and Society
- Defense Threat Reduction Agency
- Japan Atomic Energy Agency
- Japan Society for the Promotion of Science