Abstract
Single-crystal and polycrystalline CdTe-CdI2 solid solutions containing 0.016 to 0.350 mol % CdI2 have been studied using microwave photoconductivity measurements. The results demonstrate that the magnitude of their photoresponse and the shape of the photoresponse decay curve depend on the doping level and the degree of dispersion. The observed effect of doping level on the photogenerated electron decay kinetics in cadmium telluride is interpreted in terms of self-compensation, which leads to redistribution of trap energies. The recombination rate constant for free electrons and holes in CdTe is determined to be (3 ± 1) × 10−11 cm3/s, independent of the doping level and the degree of dispersion of the samples.
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