Study of the A1-xBxC Mixed Crystals by Raman Scattering

Abstract

Observations of Raman scattering associated with vibrational modes in Zn1-xMgxSe and Zn1-xBexSe semiconducting mixed crystals are reported. Measurements were made at room temperature for Zn1-xMgxSe crystals with Mg content in the range 0 < x < 0.43 and Zn1-xBexSe crystals with Be content in the range 0 < x < 0.41. From the polarized Raman spectra the longitudinal optical (LO) and transverse optical (TO) modes which corresponding to ZnSe-, MgSe- and BeSe-like single crystals are distinguished. Theoretical calculations of the frequencies of the ZnSe- and BeSe-like modes were also performed using modified random element isodisplacement (MREI) model. The optical modes of Zn1-xBexSe are compared with those of Zn1-xMgxSe.