Growth and characterization of Cd1-xZnxTe crystals with high Zn concentrations

The crystalline quality of large grain size Cd1-xZnxTe with high Zn concent rations(0.45 < x < 0.85) grown by a zone melting process was investigated u sing photoluminescence, X-ray diffraction, optical transmission and micro-R aman measurements. We have found that extrinsic and intrinsic factors lead to Zn segregation encountered in both the radial and the longitudinal direc tions. The degree of segregation depends on the nominal Zn concentration. I n addition, small precipitates of tellurium are found in the regions with l ow Zn concentrations in the solid solution. Such precipitates are absent in regions with high Zn concentrations. (C) 2000 Elsevier Science B.V. All ri ghts reserved.