A study of the mechanisms underlying the origin of near-band-edge photoreflectance (PR) in CdTe is reported. We find that multiple transitions, including excitons, must be considered to correctly interpret PR signals at 80 and 296 K near the E₀ energy in CdTe. Spectra were measured for both undoped and iodine-doped n-type CdTe. Comparisons with photoluminescence recombination energies and line shapes are made. Free exciton and donor-related transitions dominate the PR signal from CdTe at 80 K, while the 296-K PR spectra is primarily excitonic in nature, even in the n-type material.
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Yu et al. (1995) studied this question.
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