Issue 5, 2016
From the journal:

Journal of Materials Chemistry A

Studies on thermoelectric figure of merit of Na-doped p-type polycrystalline SnSe

Eyob K. Chere,†a   Qian Zhang,†a   Keshab Dahal,a   Feng Cao,a   Jun Maoa  and  Zhifeng Ren*a  

* Corresponding authors

a Department of Physics and TcSUH, University of Houston, Houston, Texas 77204, USA

Abstract

SnSe has attracted some attention due to the recent report of record high thermoelectric figure-of-merit (ZT) of ∼2.6 at about 923 K in single crystals. Even though the ZT is high in single crystal SnSe, it was very low in its polycrystalline form due to the very low electrical conductivity (<103 S m−1) from 300 K to 700 K. In this work, we report studies on enhancement of electrical conductivity by Na doping to optimize the carrier concentration in polycrystalline SnSe prepared by melting and hot pressing. A room temperature carrier concentration of ∼2.7 × 1019 cm−3 was obtained in 2 atm% Na-doped SnSe samples with the highest power factor obtained in 1.5 atm% Na-doping. A peak ZT of ∼0.8 was achieved at 773 K along the hot pressing direction and the average ZT was improved.

Graphical abstract: Studies on thermoelectric figure of merit of Na-doped p-type polycrystalline SnSe

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Article information

DOI
https://doi.org/10.1039/C5TA08847J
Article type
Paper
Submitted
03 Nov 2015
Accepted
31 Dec 2015
First published
04 Jan 2016

J. Mater. Chem. A, 2016,4, 1848-1854

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Studies on thermoelectric figure of merit of Na-doped p-type polycrystalline SnSe

E. K. Chere, Q. Zhang, K. Dahal, F. Cao, J. Mao and Z. Ren, J. Mater. Chem. A, 2016, 4, 1848 DOI: 10.1039/C5TA08847J

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