Results
Title

Thermoelectric and Galvanomagnetic Properties of Layered n-Bi<sub>2 –</sub><sub>x</sub>Sb<sub>x</sub>Te<sub>3 –</sub><sub>y</sub>Se<sub>y</sub> Films.

Authors

Lukyanova, L. N.; Usov, O. A.; Volkov, M. P.

Abstract

The thermoelectric properties in the temperature range 4.2–300 K and magnetoresistance oscillations in strong magnetic fields at low temperatures are studied in nanostructured layered films of topological thermoelectric materials n-Bi2 –xSbxTe3 –ySey. It is shown that the thermoelectric figure of merit in layered n-Bi2 –xSbxTe3 –ySey films is larger than that in the bulk material due both to an increase in the Seebeck coefficient below room temperature and to a decrease in the thermal conductivity and its weaker temperature dependence. Analysis of the magnetoresistance oscillations is used to determine the parameters of the topological surface states of Dirac fermions and estimate their influence on the thermoelectric properties.

Subjects

FERROELECTRIC thin films; SEMIMETALS; THERMOELECTRIC materials; SEEBECK coefficient; BULK solids; MAGNETIC fields; THERMAL conductivity

Publication

Semiconductors, 2019, Vol 53, Issue 5, p620

ISSN

1063-7826

Publication type

Academic Journal

DOI

10.1134/S1063782619050154