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

Hong, Min ORCID: https://orcid.org/0000-0002-6469-9194 and Chen, Zhi-Gang ORCID: https://orcid.org/0000-0002-9309-7993 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 mid-temperature range. The enhanced power-factor is caused by the high preferential orientation, large carrier concentration, and the band convergence of multiplevalences. The as-synthesized two-dimensional 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: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 15 Jun 2022 03:08
Last Modified: 15 Jun 2022 23:33
Uncontrolled Keywords: Band engineering; Figure of merits; Microwave assisted; Preferential orientation; Solvothermal method; Structure evolution; Temperature range; Thermoelectric performance
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401605 Functional materials
40 ENGINEERING > 4016 Materials engineering > 401699 Materials engineering not elsewhere classified
Identification Number or DOI: https://doi.org/10.1039/c7ta02677c
URI: http://eprints.usq.edu.au/id/eprint/49051

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