Influence of the metal content in the optical constants of silver-photodoped As33S67 amorphous thin films

Ag-x(As033S0.67)(100-x) amorphous chalcogenide thin films have been prepare d by the process of photodissolution or photodoping, reaching silver concen trations of up to 16.5 at. %. The optical constants df the photodoped thin- film samples have been calculated from the envelopes of the transmission sp ectra, taken at normal incidence. The dispersion of the refractive index wa s analysed on the basis of the single-oscillator model proposed by Wemple a nd DiDomenico. This model allo cvs obtaining structural information of the silver-photodoped layers from optical data. The optical absorption edge is described using the non-direct transition model suggested by Tauc, and a cl ear decrease of the optical gay of the photodoped product, with the silver content, has been found.