Enhancing thermoelectric properties of InTe nanoprecipitates-embedded Sn1-xInxTe microcrystals through anharmonicity and strain engineering

Moshwan, Raza and Shi, Xiao-Lei ORCID: https://orcid.org/0000-0003-0905-2547 and Liu, Wei-Di and Wang, Yuan and Xu, Shengduo and Zou, Jin and Chen, Zhi-Gang (2019) Enhancing thermoelectric properties of InTe nanoprecipitates-embedded Sn1-xInxTe microcrystals through anharmonicity and strain engineering. ACS Applied Energy Materials, 2 (4). pp. 2965-2971.


Abstract

As one of Pb-free thermoelectric materials, tin telluride (SnTe) has received extensive attention. Here, we report InTe nanoprecipi-tates embedded Sn1-xInxTe microcrystals with an improved thermoelectric performance prepared via a facile solvothermal method. In dopants can strikingly enhance the room-temperature thermopower from ~ 23 μV K-1 to ~ 88 μV K-1, which is attributed to the distortion of density of states near the Fermi level in the valence band of Sn1-xInxTe. Our detailed structural characterizations indi-cate that point defects, anharmonic-bonding, dislocations and strain around nanoprecipitates can effectively strengthen phonon scattering, and in turn significantly reduce lattice thermal conductivity. Raman spectroscopy analysis shows that optical phonon modes shifts toward higher wavenumber, indicating the change of the bonding force and the chemical environment in the system, which facilitates additional resistance to propagate heat carrying phonons. Finally, a high power factor of ~ 21.8 μW cm-1 K-2 and a corresponding figure of merit, ZT of ~ 0.78 are obtained in Sn0.99In0.01Te at 773 K. This study explores the fundamental In-doping mechanisms in a SnTe matrix, and demonstrates anharmonicity and strain engineering as effective approaches to boosting thermoe-lectric performance, which provides a new avenue in achieving high-performance thermoelectric properties of materials.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2019 American Chemical Society.
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: 05 Mar 2020 04:27
Last Modified: 13 Mar 2020 06:30
Uncontrolled Keywords: thermoelectric, SnTe, InTe nanoprecipitate, anharmonicity, strain engineering
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Identification Number or DOI: 10.1021/acsaem.9b00399
URI: http://eprints.usq.edu.au/id/eprint/37930

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