The effect of zinc concentration upon optical and dielectric properties of Cd1−xZnxSe

• DOI: 10.1016/j.physb.2010.02.024
• Publication Date: 2010-02-11T11:53:40Z
• Authors: F. Mezrag; W. Kara Mohamed; N. Bouarissa
• Keywords: Pseudopotential; Crystal (programming language)

Abstract Theoretical investigations of the optical and dielectric properties of Cd 1− x Zn x Se with zinc-blende crystal structure are reported. The calculations are mainly based on the pseudopotential framework within the virtual crystal approximation in which the effect of compositional disorder is involved. A meaningful agreement with the experimental optical band-gap bowing parameter is only obtained when the disorder effect is included in the calculation. The zinc concentration dependence of the selected features of Cd 1− x Zn x Se , such as energy band-gaps, refractive index and dielectric constants has been examined. All studied quantities are found to vary monotonically with zinc concentration x . The high-frequency and static dielectric constants have been scaled with the fundamental band-gap energy ( E g ). Such scaling showed that the variation of the dielectric constants versus E g exhibits a non-linear behavior.