Backscattering measurements on Ag photodoping effect in As 2S3 glass

Abstract

350-keV He+ backscattering analysis was applied to the investigation of Ag photoinduced diffusion into As2S3 glass and proved to be suitable for the present purposes. Silver atoms diffuse into As2S3 by photoirradiation (termed "photodoping"). Photodoped Ag concentration is nearly uniform and falls abruptly beyond a certain depth. The concentration of S in the photodoped region is nearly equivalent to that in As2S3. Preirradiation of As2S3 before Ag deposition enhances Ag diffusion, which results in a tailing of the Ag concentration. The preirradiation effect disappears after a long period. Thermal diffusion of materials was also investigated for comparison.