Optical Reflectivity and Band Structure ofZnS1−xSexMixed Crystals

Abstract

Optical reflectivity measurements on mixed crystals of the system ${\mathrm{ZnS}}_{1-x}{\mathrm{Se}}_x (0\mathrm{}<~x<~1)$ were made at room temperature in the energy region of 2.5 to 9.5 eV. Indirect as well as direct optical transitions were observed in the ${\epsilon }_2$ spectra computed by a Kramers-Kronig analysis. Considering the complete series of mixed crystals, the very complex structure of the observed spectra can only be explained assuming separated energy bands for the different components of these mixed crystals.