Limit of zT enhancement in rocksalt structured chalcogenides by band convergence
Article
Article Title | Limit of zT enhancement in rocksalt structured chalcogenides by band convergence |
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ERA Journal ID | 1131 |
Article Category | Article |
Authors | Hong, Min (Author), Chen, Zhi-Gang (Author), Pei, Yanzhong (Author), Yang, Lei (Author) and Zou, Jin (Author) |
Journal Title | Physical Review B: Covering condensed matter and materials physics |
Journal Citation | 94 (16) |
Number of Pages | 5 |
Year | 2016 |
Place of Publication | United States |
ISSN | 1098-0121 |
1550-235X | |
2469-9950 | |
2469-9969 | |
Digital Object Identifier (DOI) | https://doi.org/10.1103/PhysRevB.94.161201 |
Web Address (URL) | https://journals.aps.org/prb/abstract/10.1103/PhysRevB.94.161201 |
Abstract | Rocksalt structured chalcogenides, such as PbTe, PbSe, and SnTe, are the top candidates for midtemperature thermoelectric applications, and their p-type thermoelectric efficiencies can be enhanced via aligning the valence bands. Here, we provided comprehensive numerical investigations on the effects of band convergence on electronic properties. We found that the extra valance band can indeed significantly enhance the power factor. Nevertheless, the extra valance band can also increase the electronic thermal conductivity, which partially offsets the enhanced power factor for the overall figure of merit. Finally, we predicted that the maximum figure of merit for PbTe, PbSe, and SnTe can reach 2.2, 1.8, and 1.6, respectively, without relying on the reduction in lattice thermal conductivity. |
Keywords | Rocksalt structured chalcogenides; PbTe, PbSe, and SnTe; midtemperature thermoelectric applications; valence bands; band convergence; power factor; electronic thermal conductivity; lattice thermal conductivity |
ANZSRC Field of Research 2020 | 340399. Macromolecular and materials chemistry not elsewhere classified |
519999. Other physical sciences not elsewhere classified | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Queensland |
Tongji University, China | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4145/limit-of-zt-enhancement-in-rocksalt-structured-chalcogenides-by-band-convergence
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