Highly (00l)-oriented Bi2Te3/Te heterostructure thin films with enhanced power factor

Shang, Hong-Jing and Ding, Fa-Zhu and Deng, Yuan and Zhang, He and Dong, Ze-Bin and Xu, Wen-Juan and Huang, Da-Xing and Gu, Hong-Wei and Chen, Zhi-Gang (2018) Highly (00l)-oriented Bi2Te3/Te heterostructure thin films with enhanced power factor. Nanoscale, 10 (43). pp. 20189-20195. ISSN 2040-3364

Abstract

Introducing nanoscale heterostructure interfaces into material matrix is an effective strategy to optimize the thermoelectric performance by energy-dependent carrier filtering effect. In this study, highly (00l)-oriented Bi2Te3/Te heterostructure thin films have been fabricated on single-crystal MgO substrates using a facile magnetron co-sputtering method. Bi2Te3/Te heterostructure thin films with Te contents of 63.8 at% show an optimized thermoelectric performance, which possess a Seebeck coefficient of -157.7 μV K-1 and an electrical conductivity of 9.72 × 104 S m-1, leading to a high power factor approaching 25 μW cm-1 K-2. The partially decoupled behavior of the Seebeck coefficient and electrical conductivity is contributed to Bi2Te3/Te heterostructure interfaces, which causes interfacial barrier filtering and scattering effects; thus, a high level of the Seebeck coefficient is obtained. Meanwhile, carrier transport in a-b plane can benefit from the highly preferred orientation, which guarantees a remarkably high electrical conductivity. We anticipate that our strategy may guide the way for preparing high-performance thermoelectric materials by microstructure design and regulation.


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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
Date Deposited: 04 Mar 2019 02:03
Last Modified: 05 Mar 2019 01:13
Uncontrolled Keywords: thermoelectricity; thermoelectric equipment; antimony telluride
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Funding Details:
Identification Number or DOI: 10.1039/c8nr07112h
URI: http://eprints.usq.edu.au/id/eprint/36061

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