VISIBLE PHOTOLUMINESCENCE IN UNDOPED AND ZN-DOPED CUALS2

Photoluminescence (PL) properties of undoped and Zn-doped CuAlS2 cryst als have been studied. The Zn-doped crystals have been found to exhibi t several strong emissions in the green-to-violet spectral region, the dominant emission being determined by the concentration of Zn-dopant. On the basis of the detailed PL studies we have determined the activa tion energies of the donor-like Zn(Cu)- and the acceptor-like V(Cu)-de fects, the last result being confirmed by the ESR experiments.