Synergistic effect approaching to record-high figure of merit in the shear exfoliated n-type Bi2O2-2xTe2xSe

Pan, Lin and Liu, Wei-Di and Zhang, Jie-Yun and Shi, Xiao-Lei ORCID: https://orcid.org/0000-0003-0905-2547 and Gao, Han and Liu, Qing-feng and Shen, Xiaodong and Lu, Chunhua and Wang, Yi-Feng and Chen, Zhi-Gang (2020) Synergistic effect approaching to record-high figure of merit in the shear exfoliated n-type Bi2O2-2xTe2xSe. Nano Energy, 69 (Article 104394). ISSN 2211-2855


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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 03 Mar 2020 23:55
Last Modified: 08 May 2020 01:57
Uncontrolled Keywords: Bi2O2-2xTe2xSe, synergistic, thermoelectric, shear exfoliation
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Identification Number or DOI: 10.1016/j.nanoen.2019.104394
URI: http://eprints.usq.edu.au/id/eprint/37946

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