Enhanced thermoelectric properties of nanostructured n-type Bi2Te3 by suppressing Te vacancy through non-equilibrium fast reaction
Article
Article Title | Enhanced thermoelectric properties of nanostructured n-type Bi2Te3 by suppressing Te vacancy through non-equilibrium fast reaction |
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ERA Journal ID | 3854 |
Article Category | Article |
Authors | Wang, Yuan (Author), Liu, Wei-Di (Author), Shi, XIao-Lei (Author), Hong, Min (Author), Wang, Li-Jun (Author), Li, Meng (Author), Wang, Hao (Author), Zou, Jin (Author) and Chen, Zhi-Gang (Author) |
Journal Title | Chemical Engineering Journal |
Journal Citation | 391 |
Article Number | 123513 |
Number of Pages | 7 |
Year | 2020 |
Publisher | Elsevier |
Place of Publication | Switzerland |
ISSN | 1385-8947 |
1873-3212 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.cej.2019.123513 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S1385894719329286 |
Abstract | As one promising low-temperature thermoelectric material, Bi2Te3 suffers from high carrier concentrations beyond the optimal value contributed by excess Te vacancies. In this study, Te vacancies can be effectively suppressed in the n-type nanostructured Bi2Te3 via a non-equilibrium reaction induced by spark plasma sintering. The electron concentration has been greatly reduced from pristinely ~1 × 1020 to ~7 × 1019 cm−3, generating a decent power factor of 12.84 µW cm−1 K−2 at 320 K. Meanwhile, the decreased electronic thermal conductivity due to deteriorated electrical conductivity enables a very low thermal conductivity of 0.48 W m−1 K−1, which ultimately secures a promising peak figure of merit zT of ~1.1 at 420 K and an outstanding average zT of ~1 from 320 to 470 K. Such a high performance is one of the cutting-edge values reported in binary n-type Bi2Te3 so far. Our study provides a new insight into manipulating intrinsic point defects in nanostructured Bi2Te3 thermoelectric materials for achieving higher zT. |
Keywords | thermoelectrics, bismuth telluride, Te vacancy, nanostructure |
ANZSRC Field of Research 2020 | 401605. Functional materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Centre for Future Materials |
University of Queensland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q593q/enhanced-thermoelectric-properties-of-nanostructured-n-type-bi2te3-by-suppressing-te-vacancy-through-non-equilibrium-fast-reaction
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