Enhancing the thermoelectric performance of SnSe1-xTex nanoplates through band engineering
Article
Article Title | Enhancing the thermoelectric performance of SnSe1-xTex nanoplates through band engineering |
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ERA Journal ID | 201058 |
Article Category | Article |
Authors | Hong, Min (Author), Chen, Zhi-Gang (Author), Yang, Lei (Author), Chasapis, Thomas C. (Author), Kang, Stephen Dongmin (Animator), Zou, Yichao (Author), Auchterlonie, Graeme John (Author), Kanatzidis, Mercouri G. (Author), Snyder, G. Jeffrey (Author) and Zou, Jin (Author) |
Journal Title | Journal of Materials Chemistry A |
Journal Citation | 5 (21), pp. 10713-10721 |
Number of Pages | 9 |
Year | 2017 |
Publisher | The Royal Society of Chemistry |
Place of Publication | Cambridge, United Kingdom |
ISSN | 2050-7488 |
2050-7496 | |
Digital Object Identifier (DOI) | https://doi.org/10.1039/c7ta02677c |
Web Address (URL) | https://pubs.rsc.org/en/Content/ArticleLanding/2017/TA/C7TA02677C#!divAbstract |
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. |
Keywords | thermoelectricity; thermoelectric equipment; thermoelectric material |
ANZSRC Field of Research 2020 | 340210. Solid state chemistry |
401807. Nanomaterials | |
510403. Condensed matter modelling and density functional theory | |
401605. Functional materials | |
Public Notes | © The Royal Society of Chemistry 2017. |
Byline Affiliations | University of Queensland |
Centre for Future Materials | |
Northwestern University, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5051/enhancing-the-thermoelectric-performance-of-snse1-xtex-nanoplates-through-band-engineering
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