Realizing high thermoelectric properties of SnTe via synergistic band engineering and structure engineering

Moshwan, Raza and Liu, Wei-Di and Shi, Xiao-Lei and Wang, Yun-Peng and Zou, Jin and Chen, Zhi-Gang (2019) Realizing high thermoelectric properties of SnTe via synergistic band engineering and structure engineering. Nano Energy, 65. pp. 1-9. ISSN 2211-2855

Abstract

Lead-free tin telluride (SnTe) has been drawn enormous attention recently due to their potential applications in the mid-temperature thermoelectric power generation. In this study, we systematically investigated the thermoelectric properties of In/Sr co-doped SnTe via first principles density functional theory calculation, coupled with extensive structural characterizations and property measurements. From which, we found that the co-doping of In and Sr in SnTe can significantly improve the electrical transport properties through unique interplay of band structure modifications, and the reduced lattice thermal conductivity can be achieved via strong phonon scattering by point defects, nanoprecipitates, and grain boundaries. Consequently, a record high power factor of ~33.88 μWcm−1K−2 and a peak figure of merit of ~1.31 have been achieved at 823 K for the Sn0.925In0.025Sr0.05Te pellet. This study indicates that In/Sr co-doping can effectively make incorporation of resonant levels, band degeneracy, band gap tuning and nanostructuring, leading to the achieving high thermoelectric performance of SnTe material.


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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: 22 Jan 2020 02:00
Last Modified: 29 Jan 2020 05:48
Uncontrolled Keywords: Thermoelectric; SnTe; In/Sr co-doping; Band engineering; Nanostructuring
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Socio-Economic Objective: D Environment > 96 Environment > 9606 Environmental and Natural Resource Evaluation > 960601 Economic Incentives for Environmental Protection
Funding Details:
Identification Number or DOI: 10.1016/j.nanoen.2019.104056
URI: http://eprints.usq.edu.au/id/eprint/37353

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