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Tl2GeS3 single crystals belonging to a chalcogenide compound were grown by using the chemical transport reaction method with iodine as a transport agent. The Tl2GeS3 single crystal was crystallized into a triclinic structure. The optical energy gap of the single crystal was found to be 2.529 eV at 13 K. The temperature dependence of the optical energy gaps in the temperature range of 13  298 K was well fitted with the Varshni equation.s


Tl2GeS3 single crystals belonging to a chalcogenide compound were grown by using the chemical transport reaction method with iodine as a transport agent. The Tl2GeS3 single crystal was crystallized into a triclinic structure. The optical energy gap of the single crystal was found to be 2.529 eV at 13 K. The temperature dependence of the optical energy gaps in the temperature range of 13  298 K was well fitted with the Varshni equation.s