“…In particular, amorphous chalcogenides are known to exhibit semiconducting properties due to their narrow band-gaps with typical E g values of ~2 eV for sulfides and ~1.5 eV for selenides, compared to those characteristic (> 3eV) of oxide glasses [1,6]. On the far end, telluride glasses can reach band-gap energies below 1 eV and can therefore exhibit unusually high electronic conductivities, especially when alloyed with metals such as Cu, Ag, Tl or Pb [7][8][9][10][11][12]. Within these metal-telluride systems the Cu-As-Te ternary shows one of the widest glassformation domain and highest metal solubility [13,14].…”