Abstract
β-In2S3 and β-In2S3:Co2+ singlecrystals were grown by the chemical transport reaction method usingIn2S3, S, and ZnS as starting materials and (ZnCl2 + I2) asa transport agent. The single crystals crystallized into a tetragonalstructure. The indirect optical energy band gaps of the single crystals at 298 Kwere found to be 2.240 eV and 1.814 eV for β-In2S3 andβ-In2S3:Co2+, respectively. The direct opticalenergy band gaps were found to be 2.639 eV and 2.175 eV for β-In2S3and β-In2S3:Co2+, respectively. Impurity optical absorptionpeaks were observed for the β-In2S3:Co2+ single crystal.These impurity absorption peaks were assigned, based on the crystal fieldtheory, to the electron transitions between the energy levels of the Co2+ion sited in Td symmetry.
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