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 language | English |
|---|---|
| Pages (from-to) | 10713-10721 |
| Number of pages | 9 |
| Journal | Journal of Materials Chemistry A |
| Volume | 5 |
| Issue number | 21 |
| DOIs | |
| Publication status | Published - 2017 |
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ASJC Scopus subject areas
- Chemistry(all)
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
Cite this
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 journal › Article
}
TY - JOUR
T1 - Enhancing the thermoelectric performance of SnSe1-xTex nanoplates through band engineering
AU - Hong, Min
AU - Chen, Zhi Gang
AU - Yang, Lei
AU - Chasapis, Thomas C.
AU - Kang, Stephen Dongmin
AU - Zou, Yichao
AU - Auchterlonie, Graeme John
AU - Kanatzidis, Mercouri G
AU - Snyder, G. Jeffrey
AU - Zou, Jin
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85021682132&partnerID=8YFLogxK
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U2 - 10.1039/c7ta02677c
DO - 10.1039/c7ta02677c
M3 - Article
VL - 5
SP - 10713
EP - 10721
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
SN - 2050-7488
IS - 21
ER -