Synergistic effect approaching to record-high figure of merit in the shear exfoliated n-type Bi2O2-2xTe2xSe
Article
Article Title | Synergistic effect approaching to record-high figure of merit in the shear exfoliated n-type Bi2O2-2xTe2xSe |
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ERA Journal ID | 201288 |
Article Category | Article |
Authors | Pan, Lin (Author), Liu, Wei-Di (Author), Zhang, Jie-Yun (Author), Shi, Xiao-Lei (Author), Gao, Han (Author), Liu, Qing-feng (Author), Shen, Xiaodong (Author), Lu, Chunhua (Author), Wang, Yi-Feng (Author) and Chen, Zhi-Gang (Author) |
Journal Title | Nano Energy |
Journal Citation | 69, pp. 1-7 |
Article Number | 104394 |
Number of Pages | 7 |
Year | 2020 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 2211-2855 |
2211-3282 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.nanoen.2019.104394 |
Web Address (URL) | https://www.sciencedirect.com/science/article/abs/pii/S2211285519311085 |
Abstract | Due to the nature of high stability and eco-friendliness, layered n-type Bi2O2Se-based thermoelectric materials have attracted extensive research interest. In order to reduce lattice thermal conductivity and enhance thermoelectric performance of Bi2O2Se-based thermoelectric materials, here, we introduced Te substitution at O site into Bi2O2-2xTe2xSe prepared by a shear exfoliation method. The induced high-density nanosized Bi2O2Se grains and point defects can effectively scatter both mid and short-wavelength phonons, leading to a low lattice thermal conductivity of ~0.57 W m−1 K−1 at ~773 K. Furthermore, Se vacancies generated by the shear exfoliation induced a high carrier concentration approaching the optimized level, and in turn lead to relatively high electrical performance. The synergistic high electrical performance and low lattice thermal conductivity secured a record-high dimensionless figure of merit, zT, of ~0.69 at ~773 K. This study indicates that shear exfoliation method and Te substitution are promising methods to optimize the thermoelectric properties of Bi2O2Se-based thermoelectric materials. |
Keywords | Bi2O2-2xTe2xSe, synergistic, thermoelectric, shear exfoliation |
ANZSRC Field of Research 2020 | 401605. Functional materials |
Byline Affiliations | Nanjing Tech University, China |
Centre for Future Materials | |
University of Queensland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5961/synergistic-effect-approaching-to-record-high-figure-of-merit-in-the-shear-exfoliated-n-type-bi2o2-2xte2xse
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