Backscattering measurements on Ag photodoping effect in As2S3 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.