Enhancing the thermoelectric performance of SnSe1-xTex nanoplates through band engineering

Hong, Min and Chen, Zhi-Gang and Yang, Lei and Chasapis, Thomas C. and Kang, Stephen Dongmin and Zou, Yichao and Auchterlonie, Graeme John and Kanatzidis, Mercouri G. and Snyder, G. Jeffrey and Zou, Jin (2017) Enhancing the thermoelectric performance of SnSe1-xTex nanoplates through band engineering. Journal of Materials Chemistry A, 5 (21). pp. 10713-10721. ISSN 2050-7488

Abstract

We developed a facile microwave-assisted solvothermal method to produce large-scale SnSe1_xTex nanoplates with tens of microns in length and several hundred nanometers in thickness. Enhancements in both peak figure-of-merit (1.1) at 800 K and average figure-of-merit (0.56) from 300 to 800 K were achieved in the p-type SnSe0.9Te0.1 pellet. In addition to the decreased thermal conductivity, the enhancement in figure-of-merit was mainly due to the increase in the power-factor over the midtemperature range. The enhanced power-factor is caused by the high preferential orientation, large carrier concentration, and the band convergence of multiplevalences. The as-synthesized twodimensional SnSe1_xTex structures with a large size ratio between the lateral and axial directions secure high preferential orientation in the correspondingly sintered pellet, and the produced Sn vacancies increase the carrier concentration. Based on the optical properties and density functional calculations, we examined the band structure evolution of SnSe1_xTex with increasing Te ratio to confirm the band convergence. This study of alloying with Te provides an alternative approach to enhance the thermoelectric performance of SnSe.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © The Royal Society of Chemistry 2017.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - No Department
Date Deposited: 21 Jan 2019 05:55
Last Modified: 24 Jan 2019 04:44
Uncontrolled Keywords: thermoelectricity; thermoelectric equipment; thermoelectric material
Fields of Research : 03 Chemical Sciences > 0302 Inorganic Chemistry > 030206 Solid State Chemistry
10 Technology > 1007 Nanotechnology > 100708 Nanomaterials
02 Physical Sciences > 0204 Condensed Matter Physics > 020403 Condensed Matter Modelling and Density Functional Theory
09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Identification Number or DOI: 10.1039/c7ta02677c
URI: http://eprints.usq.edu.au/id/eprint/35472

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