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Improving thermoelectric performance of p-type PbSe via synergistically enhancing Seebeck coefficient and reducing electronic thermal conductivity

Abstract

In this work, the thermoelectric performance of p-type PbSe was improved dramatically by enhancing Seebeck coefficient and reducing electronic thermal conductivity through alloying CdTe. CdTe alloying effectively increased the effective mass of p-type Pb0.98Na0.02Se due to band flattening and promoting the valence band convergence, which contributed to a high Seebeck coefficient of ~ 238 μV K-1 at 860 K and large power factor of ~ 18.2 μW cm-1 K-2 at 860 K for Pb0.98Na0.02Se+4%CdTe. Furthermore, CdTe alloying reduced the carrier mobility of Pb0.98Na0.02Se due to the enhanced scattering of impurity atoms, which results in a remarkable reduction of electronic thermal conductivity. As a result, due to higher power factor and lower thermal conductivity, a high thermoelectric figure of merit ZT ~ 1.5 at 860 K was achieved in Pb0.98Na0.02Se+4%CdTe. This paper provides one novel approach to enhance thermoelectric performance of p-type PbSe through synergistically manipulating electrical and thermal transport properties.

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Supplementary files

Article information


Submitted
20 Dec 2019
Accepted
11 Feb 2020
First published
11 Feb 2020

J. Mater. Chem. A, 2020, Accepted Manuscript
Article type
Paper

Improving thermoelectric performance of p-type PbSe via synergistically enhancing Seebeck coefficient and reducing electronic thermal conductivity

Z. Huang, D. Wang, C. Li, J. Wang, G. Wang and L. Zhao, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/C9TA13927C

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