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2 + single crystals were grown by the chemical transport reaction method. The optical absorption and photoconductivity measurements carried out at the temperature region 20--300 K and the photoacoustic spectrum was done at 292 K. The results showed that the structural defects of the p. In 2S 3 single crystal decreased as cobalt was introduced into the samples and that the cobalt atoms were located at the Td symmetry site of the /3' In 2 S 3 host lattice as Co 2 + ion.