Optical properties of In2S3:Co2+ single crystals

β⋅In2 S3 and β⋅In2S3 :Co2+ 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 β⋅In2 S3 single crystal decreased as cobalt was introduced into the samples and that the cobalt atoms were located at the Td symmetry site of the β⋅In2 S3 host lattice as Co2+ ion.