Achieving high Figure of Merit in p-type polycrystalline Sn0.98Se via self-doping and anisotropy-strengthening

Shi, Xiaolei, Chen, Zhi-Gang, Liu, Weidi, Yang, Lei, Hong, Min, Moshwan, Raza, Huang, Liqing and Zou, Jin (2018) Achieving high Figure of Merit in p-type polycrystalline Sn0.98Se via self-doping and anisotropy-strengthening. Energy Storage Materials, 10 130-138. doi:10.1016/j.ensm.2017.08.014


Author Shi, Xiaolei
Chen, Zhi-Gang
Liu, Weidi
Yang, Lei
Hong, Min
Moshwan, Raza
Huang, Liqing
Zou, Jin
Title Achieving high Figure of Merit in p-type polycrystalline Sn0.98Se via self-doping and anisotropy-strengthening
Formatted title
Achieving high Figure of Merit in p-type polycrystalline Sn0.98Se via self-doping and anisotropy-strengthening
Journal name Energy Storage Materials
ISSN 2405-8297
2405-8289
Publication date 2018-01-01
Year available 2018
Sub-type Article (original research)
DOI 10.1016/j.ensm.2017.08.014
Open Access Status Not yet assessed
Volume 10
Start page 130
End page 138
Total pages 9
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Subject 2105 Renewable Energy, Sustainability and the Environment
2500 Materials Science
2102 Energy Engineering and Power Technology
Abstract In this study, we report a record peak Figure of Merit (ZT) of 1.36 ± 0.12 in polycrystalline SnSe macro-sized plates, fabricated via a facile solvothermal method. The obtained exceptional thermoelectric performance comes from their high power factor of 6.95 μWcmK and ultra-low thermal conductivity of 0.42 WmK at 823 K. Through our Hall measurements, we found the high carrier concentration of 1.5 × 10 cm derived from the self-doping, which contributes to a high electrical conductivity and a moderate Seebeck coefficient. Moreover, detailed structural characterizations reveal a strong preferred orientation in our sintered SnSe pellets. The phonon scattering sources such as grain boundaries, synergistically coupled with the anharmonicity boding of SnSe crystals with a high density of 98.5%, result in an intrinsic ultra-low thermal conductivity. This study provides a new perspective to achieve high thermoelectric performance in polycrystalline SnSe materials.
Keyword Anisotropy-strengthening
Self-doping
Solvothermal synthesis
Thermoelectric materials
Tin selenide
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
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Centre for Microscopy and Microanalysis Publications
 
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