Composition dependence of Ag photodoping into amorphous Ge-S films

Photodoping kinetic studies of thin sample of Ag/GexS100−x (21≤x≤45) were made through optical transmission measurements. The initial photodoping rate increases with increasing S content, whereas the total amount of dissolved Ag shows a maximum around the stoichiometric composition GeS2. The results are similar to those of the Ag/Ge-Se system but different from the Ag/As-S system. The composition dependencies are qualitatively explained by the structure of Ge-S bulk glass and the glass-forming ability of Ag-Ge-S bulk glass. In this study it was also found that aging effect is considerable within several hours after sample preparation and a reciprocity law holds between the initial rate and illumination power.