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Specific features of the low-temperature conductivity and photoconductivity of CuInSe2-ZnIn2Se4 alloys

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Abstract

n-type CuInSe2-ZnIn2Se4 alloy single crystals are grown by the horizontal variant of the Bridgman method. The slight temperature dependence of the conductivity, high electron concentration, and the low photoconductivity of single crystals containing a low (5–10 mol %) fraction of ZnIn2Se4 are indicative of the nearly degenerate state of the crystals. It is established that, in the CuInSe2-ZnIn2Se4 single crystals containing 15 and 20 mol % of ZnIn2Se4, the hopping mechanism of conductivity is dominant at temperatures of T ∼ 27–110 K. At T ≥ 110 K, hopping conductivity gives way to activated conductivity. It is found that the specific feature of the low-temperature (27–77 K) photoconductivity spectrum of single crystals with ∼15 and 20 mol % of ZnIn2Se4 is a single narrow peak at a wavelength of λmax = 1190–1160 nm.

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Correspondence to O. V. Novosad.

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Original Russian Text © V.V. Bozhko, O.V. Novosad, O.V. Parasyuk, N. Vainorius, A. Sakaviciues, V. Janonis, V. Kazukauskas, A.V. Chichurin, 2014, published in Fizika i Tekhnika Poluprovodnikov, 2014, Vol. 48, No. 6, pp. 747–752.

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Bozhko, V.V., Novosad, O.V., Parasyuk, O.V. et al. Specific features of the low-temperature conductivity and photoconductivity of CuInSe2-ZnIn2Se4 alloys. Semiconductors 48, 727–732 (2014). https://doi.org/10.1134/S1063782614060086

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  • DOI: https://doi.org/10.1134/S1063782614060086

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