Anisotropy Control–Induced Unique Anisotropic Thermoelectric Performance in the n-Type Bi2Te2.7Se0.3 Thin Films
Article
Article Title | Anisotropy Control–Induced Unique Anisotropic Thermoelectric Performance in the n-Type Bi2Te2.7Se0.3 Thin Films |
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ERA Journal ID | 214172 |
Article Category | Article |
Authors | Tan, Ming (Author), Liu, Wei-Di (Author), Shi, Xiao-Lei (Author), Gao, Han (Author), Li, Hui (Author), Li, Cong (Author), Liu, Xiao-Biao (Author), Deng, Yuan (Author) and Chen, Zhi-Gang (Author) |
Journal Title | Small Methods |
Journal Citation | 3 (11), pp. 1-8 |
Article Number | 1900582 |
Number of Pages | 8 |
Year | 2019 |
Publisher | Wiley-VCH Verlag GmbH & Co. KGaA |
Place of Publication | Germany |
ISSN | 2366-9608 |
Digital Object Identifier (DOI) | https://doi.org/10.1002/smtd.201900582 |
Web Address (URL) | https://onlinelibrary.wiley.com/doi/full/10.1002/smtd.201900582 |
Abstract | Anisotropic Bi2Te3‐based thermoelectric materials have drawn extensive interest in the past decades. Here, n‐type Bi2Te2.7Se0.3 films with superhigh figure of merit are developed through anisotropy control via tuning an external electric field and deposition anisotropy. It is found that the angle of interplanar grain boundaries between (0 1 5) and (0 1 11) planes can be tuned by the applied external electric field, which leads to the strengthened anisotropy of electron mobility and simultaneously maintains low lattice thermal conductivity. Dominated by the unique change in the anisotropy of both lattice thermal conductivity and electron mobility, a record‐high zT value of ≈1.6 at room temperature can be achieved in the as‐deposited n‐type Bi2Te2.7Se0.3 film under 20 V external electric field. This work indicates that the electric field–induced deposition anisotropy control can be used to develop high‐performance Bi2Te3‐based thermoelectric films. |
Keywords | anisotropy, films, grain boundaries, n-type Bi2Te2.7Se0.3, thermoelectricity |
ANZSRC Field of Research 2020 | 401605. Functional materials |
Byline Affiliations | Henan Agricultural University, China |
University of Queensland | |
Centre for Future Materials | |
Beihang University, China | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q595q/anisotropy-control-induced-unique-anisotropic-thermoelectric-performance-in-the-n-type-bi2te2-7se0-3-thin-films
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