Abstract. We report the results of experimental studies for the optical absorption in TlGaSe 2 :Zn 2+ single crystals grown using a modified Bridgman-Stockbarger technique. The absorption measurements at different temperatures are performed with the steps 50 K. The analysis of the experimental data yield in the absorption coefficients of TlGaSe 2 :Zn varying from 20 to 800 cm -1 in the temperature region 100-300 K. Direct and indirect bandgap values for TlGaSe 2 :Zn 2+ are calculated as functions of temperature. These values are respectively equal to 2.22 and 2.04 eV at 100 K. It is revealed that the spectral dependences of the absorption coefficient in the region 60-130 cm -1 follow the Urbach rule, whereas the corresponding steepness parameter and the Urbach energy increase with increasing temperature.
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