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Boosted carrier mobility and enhanced thermoelectric properties of polycrystalline Na0.03Sn0.97Se by liquid-phase hot deformation

Abstract

SnSe emerges as a promising thermoelectric material due to an ultrahigh ZT value in its single crystal while polycrystalline SnSe offers much lower ZTs resulting from the weak texturing degree. Here, we report a novel liquid-phase hot deformation technique to enhance the texturing degree of polycrystalline Na0.03Sn0.97Se, leading to a significantly boosted carrier mobility of 30.1 cm2 V-1 s-1 at room temperature and a remarkable average power factor of 5.73 µW cm-1 K-2 between 300 and 830 K. Moreover, the liquid-phase hot deformation procedure introduces dense dislocation defects and realizes an obviously reduced lattice thermal conductivity of 0.40 W m-1 K-1 at 747 K. Consequently, a peak ZT of 0.9 at 780 K and a high average ZTave of 0.49 from 300 to 830 K were obtained for the polycrystalline Na0.03Sn0.97Se sample. This work presents that the liquid-phase hot deformation is a convenient and energy-saving strategy to enhance the texturing degree and improve the thermoelectric performance in polycrystalline SnSe materials.

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Supplementary files

Article information


Submitted
10 Jun 2020
Accepted
29 Jun 2020
First published
30 Jun 2020

This article is Open Access

Mater. Adv., 2020, Accepted Manuscript
Article type
Paper

Boosted carrier mobility and enhanced thermoelectric properties of polycrystalline Na0.03Sn0.97Se by liquid-phase hot deformation

H. Sun, C. Tan, X. Tan, H. Wang, Y. Yin, Y. Song, G. Liu, J. G. Noudem, Q. Jiang, J. Zhang, H. Huang and J. Jiang, Mater. Adv., 2020, Accepted Manuscript , DOI: 10.1039/D0MA00405G

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