Mutual Solubility and Band Gap Energy of the (CdTe)<SUB>1−<I>x</I></SUB>-(ZnSe)<I><SUB>x</SUB></I> System

Mutual solubility and band gap energy (Eg) as a function of composition for the (CdTe)1−x-(ZnSe)x system were determined by X-ray diffraction and diffuse refrectance measurement. The results are as follows.(1) X-ray diffraction study showed that CdTe and ZnSe were completely missible above 733°C, but two phases separation took place below this temperature. Two-phase ranges were found to be 0.20<x<0.85, 0.31<x<0.82, and 0.52<x<0.75 at 500, 600 and 700°C, respectively. Peak position of the missibility gap was estimated to be x=0.68±0.05 and 733±10°C.(2) The dependence of Eg on composition for the (CdTe)1−x-(ZnSe)x solid solution annealed at 900°C was found to deviate downward from linearity.(3) The following equation for the composition dependence of the Eg of the (CdTe)1−x(ZnSe)x system was derived from the experimental Eg data of the CdTe-ZnTe, CdSe-ZnSe, CdTe-CdSe, and ZnTe-ZnSe systems.(This article is not displayable. Please see full text pdf.) \ oindentthis equation is in good agreement with experimental data for the (CdTe)1−x-(ZnSe)x system within an error of 4%.

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