Abstract
The novel infrared Tl1-xIn1-xGexSe2 single crystals were synthesized by the modified Bridgman-Stockbarger method. The parameters of their energy band structure were determined. The temperature changes of the infrared parameters were studied and the phonon subsystem were evaluated. Analysis of the data is performed following the model of intrinsic defect states. The band structure calculation have established a principal role of the phonon subsystem for the observed effects. (C) 2014 Elsevier B.V. All rights reserved.