Silver photodiffusion in thin Ge30Se70 films is investigated in order to understand the structure forming in the Ge-Se host after introduction of Ag in it. Optical micrographs point towards formation of homogeneous films after deposition of the Ge-Se material on glass substrate. This structure changes and occurrence of heterogeneous regions is imaged after Ag is introduced into the Ge-Se host. Raman spectroscopy provides data about the development of the structural organization in the host in depth. It confirms that while the initial non-doped films are organized in a structure corresponding to the bulk material with analogous composition, after Ag photodiffusion, the structure on the interface Ag/Ge30Se70 film is identified as being amorphous Ag8GeSe6 which continuously changes in depth to structure of Ge-rich material. Raman spectra testify that Ag distribution reaches the bottom of the hosting Ge30Se70 films.
Jin, Mingji; Boolchand, Punit; and Mitkova, Maria. (2008). "Heterogeneity of Molecular Structure of Ag Photo-Diffused Ge30Se70 Thin Films". Journal of Non-Crystalline Solids, 354(19-25), 2719-2723. http://dx.doi.org/10.1016/j.jnoncrysol.2007.10.091