Enhancing thermoelectric properties of InTe nanoprecipitates-embedded Sn1-xInxTe microcrystals through anharmonicity and strain engineering
Article
Article Title | Enhancing thermoelectric properties of InTe nanoprecipitates-embedded Sn1-xInxTe microcrystals through anharmonicity and strain engineering |
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ERA Journal ID | 211583 |
Article Category | Article |
Authors | Moshwan, Raza (Author), Shi, Xiao-Lei (Author), Liu, Wei-Di (Author), Wang, Yuan (Author), Xu, Shengduo (Author), Zou, Jin (Author) and Chen, Zhi-Gang (Author) |
Journal Title | ACS Applied Energy Materials |
Journal Citation | 2 (4), pp. 2965-2971 |
Number of Pages | 7 |
Year | 2019 |
Publisher | American Chemical Society |
Place of Publication | Washington, United States |
ISSN | 2574-0962 |
Digital Object Identifier (DOI) | https://doi.org/10.1021/acsaem.9b00399 |
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. |
Keywords | thermoelectric, SnTe, InTe nanoprecipitate, anharmonicity, strain engineering |
ANZSRC Field of Research 2020 | 401605. Functional materials |
Public Notes | © 2019 American Chemical Society. |
Byline Affiliations | University of Queensland |
Centre for Future Materials | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5952/enhancing-thermoelectric-properties-of-inte-nanoprecipitates-embedded-sn1-xinxte-microcrystals-through-anharmonicity-and-strain-engineering
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