Optical and electrical properties of Ag-As-S glasses

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Abstract
Physical properties of Ag2S‐As2S3 glassy alloys have been studied as a function of the Ag atomic concentration x. With an increase in x, the optical‐absorption edge exhibits a red shift, while the steepness of the Urbach tail changes little. In the glasses with x≥15, the electrical conductivity is governed by Ag+ ionic conduction. The ionic conductivity exponentially increases with x, and in contrast the hole conductivity hardly changes with x; however, the activation energies for the ionic and the hole conductivity are nearly the same at about 0.4 eV for compositions with 15 ≤x≤35. These observations are discussed on the basis of atomic and electronic structures in Ag2S‐As2S3 glasses.

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