OPTICAL-PROPERTIES OF SILVER-DOPED AS33S67

Spectral dependence of the linear optical parameters (index of refract ion, absorption coefficient) of Ag-doped AS33S67 thin films in the vis ible and near infrared region is reported. The data are analysed on th e basis of a single-effective-oscillator model proposed by Wemple and DiDomenico. It is found that the oscillator energy E0 scales with the optical gap E(g)opt and decreases with increasing silver content, whil e the oscillator strength E(d) increases at the same time. It is argue d that this latter observation indicates an increase in the effective cation coordination in the system with increasing silver content.