Stoichiometry related defects in CdTe crystals

n this work, we report on the structural analyses of undoped CdTe samples grown by the vapor phase and the Bridgman methods. Different techniques were used for determining the structural defects: wet etching, high resolution X-ray diffraction, double crystal X-ray topography and monochromatic SEM-cathodoluminescence mapping. The density and the nature of the structural defects were found to be cor-related to the stoichiometry of the samples, as determined by a detailed analysis of the temperature de-pendence of the partial pressure of the vapors in equilibrium with the solid