This article is cited in 11 papers

XVI International conference ''Thermoelectrics and their applications" - 2018 (ISCTA 2018), St. Petersburg, October, 2018

On the power factor of bismuth-telluride-based alloys near topological phase transitions at high pressures

I. Korobeynikov^a, N. V. Morozova^a, L. N. Luk'yanova^b, O. A. Usov^b, S. V. Ovsyannikov<sup>cd

a</sup> Institute of Metal Physics, Ural Division of the Russian Academy of Sciences, Ekaterinburg
^b Ioffe Institute, St. Petersburg
^c Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth, Germany
^d Institute of Solid State Chemistry, Urals Branch of the Russian Academy of Sciences, Ekaterinburg

Abstract: The Seebeck coefficient $S$ and electrical conductivity $\sigma$ of bismuth-telluride-based alloys with substituents in the Bi and Te sublattices are studied at pressures up to 12 GPa at room temperature. It is shown that the electrical conductivity increases with pressure and, despite a decrease in the Seebeck coefficient, the power factor $S^2\sigma$ increases in $p$-Bi$_{0.5}$Sb$_{1.5}$Te$_{3}$ and $n$-Bi$_{2}$Te$_{1.65}$Se$_{0.65}$S$_{0.7}$ alloys. A maximum increase in the power factor is observed for $n$-Bi$_{2}$Te$_{1.65}$Se$_{0.65}$S$_{0.7}$ in the pressure range of 3–4 GPa corresponding to the electronic topological phase transition. The studied alloys are used in modeling the thermoelectric module with adjustable mechanical stress applied to thermoelements.

Received: 07.02.2019

DOI: 10.21883/FTP.2019.06.47719.28

 English version: Semiconductors, 2019, 53:6, 732–736

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