Optical studies of doped amorphous arsenic triselenide

Abstract

Photoconductivity of As2Se3:Alx and As2Se3:Cux was investigated using light of visible spectrum of wavelengths A. = 0.67 um & 0.47 urn. Two regimes were observed: regime 1, the high temperature region above maximum photoconductivity where photoconductivity (crph) is less than dark conductivity (crd), and regime 2, the intermediate temperature region below the maximum photoconductivity where crph > crd' Maximum crph for A. =0. 67 urn occurred at Tm= 313 K for all samples while for A. = 0.47 urn, it occurred at Tm= 323 K for pure As2Se3, 303 for As2Se3:Cux and at 318 K for As2Se3:A Ix. Activation energies of crph were lower than those from crd and those of doped samples were lower than those of pure sample