An approximation to the optical absorption spectra of the ternary compound ZnSe_xTe_1-x

The band structure of II-VI ternary solid solutions are calculated by using a tight-binding method combined with the virtual crystal approximation and bowing parameter. The density of states is calculated in the whole concentration range with anion substitution, emphasizing the fundamental bandgap (E_gap) dependence. The orbital distribution at the band edges and its dependence on composition x is calculated. Finally, the joint density of states is obtained in order to predict absorption spectra. A comparison with optical experimental recent reports is made.