Electronic and Optical Properties of ZnIn$_2$Te$_4$

Band structure and optical properties of defect- Chalcopyrite type semiconductor ZnIn$_2$Te$_4$ have been studied by TB-LMTO first principle technique. The optical absorption calculation suggest that ZnIn$_2$Te$_4$ is a direct-gap semiconductor having a band gap of 1.40 eV., which confirms the experimentally measured value. The calculated complex dielectric-function $\epsilon(E) = \epsilon_1(E) + i\epsilon_2(E)$ reveal distinct structures at energies of the critical points in the Brillouin zone.