An approximation to the optical absorption spectra of the ternary compoundZnSexTe1-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 concent ration range with anion substitution, emphasizing the fundamental bandgap ( E-gap) dependence. The orbital distribution at the band edges and its depen dence on composition a: is calculated. Finally, the joint density of states is obtained in order to predict absorption spectra. A comparison with opti cal experimental recent reports is made.