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

Min Hong, Zhi Gang Chen, Lei Yang, Thomas C. Chasapis, Stephen Dongmin Kang, Yichao Zou, Graeme John Auchterlonie, Mercouri G Kanatzidis, G. Jeffrey Snyder, Jin Zou

Research output: Contribution to journalArticle

29 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)10713-10721
Number of pages9
JournalJournal of Materials Chemistry A
Volume5
Issue number21
DOIs
Publication statusPublished - 2017

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Carrier concentration
Density (optical)
Alloying
Band structure
Vacancies
Density functional theory
Thermal conductivity
Optical properties
Microwaves
Temperature
Direction compound

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Hong, M., Chen, Z. G., Yang, L., Chasapis, T. C., Kang, S. D., Zou, Y., ... Zou, J. (2017). Enhancing the thermoelectric performance of SnSe1-xTex nanoplates through band engineering. Journal of Materials Chemistry A, 5(21), 10713-10721. https://doi.org/10.1039/c7ta02677c

Enhancing the thermoelectric performance of SnSe1-xTex nanoplates through band engineering. / Hong, Min; Chen, Zhi Gang; Yang, Lei; Chasapis, Thomas C.; Kang, Stephen Dongmin; Zou, Yichao; Auchterlonie, Graeme John; Kanatzidis, Mercouri G; Snyder, G. Jeffrey; Zou, Jin.

In: Journal of Materials Chemistry A, Vol. 5, No. 21, 2017, p. 10713-10721.

Research output: Contribution to journalArticle

Hong, M, Chen, ZG, Yang, L, Chasapis, TC, Kang, SD, Zou, Y, Auchterlonie, GJ, Kanatzidis, MG, Snyder, GJ & Zou, J 2017, 'Enhancing the thermoelectric performance of SnSe1-xTex nanoplates through band engineering', Journal of Materials Chemistry A, vol. 5, no. 21, pp. 10713-10721. https://doi.org/10.1039/c7ta02677c
Hong, Min ; Chen, Zhi Gang ; Yang, Lei ; Chasapis, Thomas C. ; Kang, Stephen Dongmin ; Zou, Yichao ; Auchterlonie, Graeme John ; Kanatzidis, Mercouri G ; Snyder, G. Jeffrey ; Zou, Jin. / Enhancing the thermoelectric performance of SnSe1-xTex nanoplates through band engineering. In: Journal of Materials Chemistry A. 2017 ; Vol. 5, No. 21. pp. 10713-10721.
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