Photoluminescence spectra of the AgGaTe2 single crystals doped with hydrogen

The photoluminescence spectra of single crystals of the ternary AgGaTe2 com pound obtained by the Bridgman-Stockbarger method are studied before and af ter bombardment by the 100-eV hydrogen ions of dose 10(15) cm(-2). The spec tra were detected in the temperature range from 10 to 300 K at various powe rs of laser excitation. The spectra exhibit emission bands related to the d onor-acceptor recombination, free, and bound excitons. The intensity of the se bands in crystals doped with hydrogen is higher than that in undoped cry stals. This is explained by the passivation of defects in a crystal lattice by hydrogen. The binding energy of a free exciton and the band gap in AgGa Te2 crystals are calculated at 10 K. (C) 2000 MAIK "Nauka/Interperiodica".