Reflectivity and Band Structure of Zn1-Xybxte Crystals

The reflectivity spectra of ZnTe and Zn0.97Yb0.03Te single crystals were obtained in the 2 - 6eV photon energy range at room temperature. The introduction of Yb affects the band structure of ZnTe material. Its provides to the spectra revealed distinct structures at energies of E1, E1+ and E2 critical points and to the remarkable blurring of the maximum E2, and to the disappearance of the maxima e1 and ' E0 . The observed changes in the shapes of the spectra, caused by the presence of ytterbium Yb, have been compared with the calculated band structure of binary compound ZnTe available in the literature. The intraatomic transitions, due to ytterbium introduced as an impurity to the ZnTe crystal, in the Zn0.97Yb0.03Te material were also discussed.