Infrared reflectivity ofp-type CuInTe2

An infrared reflectivity study of the lattice vibrational frequencies has been made of the chalcopyrite-structured ternary semiconductor CuIn${\mathrm{Te}}_2$. The results are more comprehensive than previously reported, enabling a fuller interpretation of the lattice vibrational spectrum to be made. Four modes with $E$ symmetry have been observed, at 172, 157, 126, and 50 ${\mathrm{cm}}^{-1\mathrm{}}$. Three $B_2$ modes were observed at 170, 101, and 46 ${\mathrm{cm}}^{-1\mathrm{}}$. A simple tetra-atomic linear chain model has been used to help classify the frequencies and also to resolve the discrepancies in previous studies of CuIn${\mathrm{Se}}_2$.