THERMOCHEMICAL MODEL OF PHYSICAL VAPOR TRANSPORT OF CADMIUM-ZINC TELLURIDE

A theoretical model for the diffusive mass transport of the ternary co mpound cadmium-zinc telluride by physical vapor transport (PVT) is pre sented. Considerable differences between the composition of the source and deposited material, and a steep decrease in the mass flu with an increase in ZnTe content in Cd(1-x)ZnxTe crystals have been found for X < 0.1. The difference in composition between the crystal and the sou rce decreases with a decrease in undercooling Delta T and/or with an i ncrease in the excess of metal constituents (Cd + Zn) in the vapor pha se.