Abstract
Two effects of an additional increase in the Hall density are revealed in the intermetallic semiconductor ZnSb doped with elements of groups I (copper, silver) and IV (lead, tin, germanium). The first effect is observed in the temperature range of 500–600 K in samples doped with impurities of both these groups. Additional doping is provided using a small additive of a Group-I element; it can be accompanied by the formation of acceptor states inside the band gap, the filling of which becomes efficient at high temperatures. The second effect occurs in doped samples at a temperature of about 600 K, independent of the acceptor additive composition and the hole density; in undoped samples it starts at approximately 400 K. This effect precedes the generation of intrinsic carriers. The intrinsic defects of the material can form localized states near the conduction-band bottom inside the band gap. Materials with optimal thermoelectric properties in a wide temperature range are obtained via double doping. The thermoelectric efficiency ZT of the samples with a low Cu concentration is not lower than 0.8 at 600 K and decreases by only 10% in the range of 575–725 K. In the Ag-doped samples this parameter exceeds 0.9 at 635 K.
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Original Russian Text © M.I. Fedorov, L.V. Prokofieva, Yu.I. Ravich, P.P. Konstantinov, D.A. Pshenay-Severin, A.A. Shabaldin, 2014, published in Fizika i Tekhnika Poluprovodnikov, 2014, Vol. 48, No. 4, pp. 448–453.
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Fedorov, M.I., Prokofieva, L.V., Ravich, Y.I. et al. Thermoelectric efficiency of intermetallic compound ZnSb. Semiconductors 48, 432–437 (2014). https://doi.org/10.1134/S1063782614040095
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DOI: https://doi.org/10.1134/S1063782614040095