Effect of Ag additive on the photoconductive properties of (Se80Te20)100−xAgx (1 ≤ x ≤ 4) thin filmsD. Singh, S. Kumar, S. Kaur and R. ThangarajEur. Phys. J. Appl. Phys., 55 3 (2011) 30301DOI: https://doi.org/10.1051/epjap/2011110127