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Kinetics Of Silver Photodiffusion Into Amorphous S-Rich Germanium Sulphide – Neutron And Optical Reflectivity, Yoshifumi Sakaguchi, Hidehito Asaoka, Maria Mitkova

Electrical and Computer Engineering Faculty Publications and Presentations

Silver photodiffusion is one of the attractive photo-induced changes observed in amorphous chalcogenides. In this research, we focus on amorphous S-rich germanium sulphide and study the kinetics of the silver photodiffusion by neutron reflectivity, as well as optical reflectivity. It was found from the neutron reflectivity profiles with 30 s time resolution that silver dissolved into the germanium sulphide layer, forming a metastable reaction layer between the Ag and the germanium sulphide layers, within 2 min of light exposure. Subsequently, silver slowly diffused from the metastable reaction layer to the germanium sulphide host layer until the Ag concentration in both …