Abstract
Microphotoluminescence methods of spectral analysis and topography are used to study the properties of polycrystalline CdTe with grain size 10–20 μm; the polycrystals were grown by a nonequilibrium reaction of direct synthesis in the vapor flow of components at a relatively low temperature. The presence of the Y and Z bands in the luminescence spectra was indicative of clearly nonequilibrium types of crystallization processes. Superlinear dependences of the intensities of these bands on the level of the band-to-band excitation, unusually weak electron-phonon interaction, and also data of monochromatic microluminescence topography correspond to the model of radiation of excitons bound by delocalized potential at various extended defects (elements of dislocations, lamellas twins, and packing faults) generated in the studied samples by the concentration and thermal fluctuations at growth surface as a result of dynamic instabilities in the vapor phase in the crystallization zone.
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Original Russian Text © V.V. Ushakov, Yu.V. Klevkov, 2008, published in Fizika i Tekhnika Poluprovodnikov, 2008, Vol. 42, No. 5, pp. 536–541.
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Ushakov, V.V., Klevkov, Y.V. Y and Z luminescence of polycrystalline cadmium telluride grown by a nonequilibrium reaction of the direct synthesis of components. Semiconductors 42, 522–527 (2008). https://doi.org/10.1134/S1063782608050060
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DOI: https://doi.org/10.1134/S1063782608050060