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The unique evolution of transport bands and thermoelectric performance enhancement by extending low-symmetry phase to high temperature in tin selenide

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Abstract

Thermoelectric conversion is a promising route to convert heat into electricity. In this process, phase transition may induce an unexpected consequence under certain conditions. In this work, we find that the extension of a low-temperature phase with a low-symmetry lattice structure, which has excellent electrical properties and low thermal conductivity, enhances the thermoelectric performance via a sulfur solid solution in SnSe-based thermoelectric materials. Peak zT values of 1.14 and 0.94 are obtained along the b- and c-axes of the SnSe0.7S0.3 single crystal at 820 K, which are about 41% and 27% higher than those of the undoped SnSe single crystals, by extending the low-symmetry structure in this experiment. Band structure calculations and angle-resolved photoemission spectroscopy (ARPES) suggest that the unique evolution of the transport bands with temperature in the SnSe-based materials should be responsible for the abnormal electrical behavior and large Seebeck coefficient in the low-symmetry structure.

Graphical abstract: The unique evolution of transport bands and thermoelectric performance enhancement by extending low-symmetry phase to high temperature in tin selenide

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Supplementary files

Article information


Submitted
13 Mar 2020
Accepted
20 May 2020
First published
21 May 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

The unique evolution of transport bands and thermoelectric performance enhancement by extending low-symmetry phase to high temperature in tin selenide

K. Peng, B. Zhang, H. Wu, H. Che, X. Sun, J. Ying, G. Wang, Z. Sun, G. Wang, X. Zhou and X. Chen, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC01318H

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