Abstract
We report a detailed investigation of the temperature dependence of the edge excitonic transitions of three Bridgman-grown wurtzite-type Cd1−x−yBexZnySe-mixed crystals using contactless electroreflectance (CER) and photoreflectance (PR) in the temperature range of 15–400 K. X-ray investigations show that the samples with beryllium (Be) content up to x=0.1 are uniform in composition and exhibit a single wurtzite phase or a wurtzite as the main phase. The transition energies of the A,B, and C excitons of Cd1−x−yBexZnySe are determined via a line-shape fit to the CER and PR spectra. The parameters that describe the temperature dependence of the interband transition energies and the broadening function of the excitonic features are evaluated and discussed.
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