Issue 48, 2021

Unusually high Seebeck coefficient arising from temperature-dependent carrier concentration in PbSe–AgSbSe2 alloys

Abstract

The Seebeck coefficient describes the temperature gradient-induced voltage in thermoelectrics. Usually, obtaining a high Seebeck coefficient within a wide temperature range is difficult as it is limited by the Goldsmid-Sharp relationship. In this work, the thermoelectric performance of the PbSe–AgSbSe2 alloy is optimized by SbCl3 doping. Interestingly, the observed Seebeck coefficient hardly varies as temperature increases from 300 K to 830 K, and its absolute value is at a high level of more than 250 μV K−1. By measuring the Hall effect, the anomalous Seebeck coefficient is attributed to the strongly temperature-dependent carrier concentration, which increases from 0.38 × 1019 cm−3 at 300 K to 3.91 × 1019 cm−3 at 830 K. Besides the high Seebeck coefficient, the alloyed compounds exhibit very low thermal conductivity, down to 0.59 W m−1 K−1 at 830 K. Finally, the peak ZT reaches 1.12 at 830 K. It is predicted that the performance of the alloys could be further improved by enhancing the carrier concentration.

Graphical abstract: Unusually high Seebeck coefficient arising from temperature-dependent carrier concentration in PbSe–AgSbSe2 alloys

Supplementary files

Article information

Article type
Paper
Submitted
02 ruj 2021
Accepted
15 stu 2021
First published
16 stu 2021

J. Mater. Chem. C, 2021,9, 17365-17370

Unusually high Seebeck coefficient arising from temperature-dependent carrier concentration in PbSe–AgSbSe2 alloys

X. Wang, G. Wu, J. Cai, Q. Zhang, J. Yang, L. Chen, H. Hu, G. Liu, X. Tan and J. Jiang, J. Mater. Chem. C, 2021, 9, 17365 DOI: 10.1039/D1TC04158D

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