Enhanced thermoelectric performance of ultrathin Bi2Se3 nanosheets through thickness control

Hong, Min and Chen, Zhi-Gang and Yang, Lei and Han, Guang and Zou, Jin (2015) Enhanced thermoelectric performance of ultrathin Bi2Se3 nanosheets through thickness control. Advanced Electronic Materials, 1 (6).

Abstract

Large-scale Bi2Se3 nanosheets with controllable thickness have been synthesized by a microwave-assisted solvothermal method. Through detailed structural characterizations, high-quality Bi2Se3 nanosheets with average thickness of 1, 4, 7, and 13 nm have been fabricated. Their thermoelectric performance has been detailed investigated by experiments and fundamental nonparabolic Kane models. A significantly reduced thermal conductivity (only 0.41 W m-1K-1), and enhanced powder factor (4.71 × 10-4 W m-1K-2 with a Seebeck coefficient of –155.32 μV K-1 and an electrical conductivity of 1.96 × 104 S m-1) are observed in the pellet composed of single-layered Bi2Se3 nanosheets. Such an enhanced thermoelectric performance is ascribed to the broadened bandgap and optimized Fermi level in ultrathin Bi2Se3 nanosheets.


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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 / Department / School: No Faculty
Date Deposited: 13 Jun 2017 06:23
Last Modified: 18 Dec 2017 05:33
Uncontrolled Keywords: band structures; Bi2Se3 nanosheets; Kane band models; thermoelectric; thickness controls
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Identification Number or DOI: 10.1002/aelm.201500025
URI: http://eprints.usq.edu.au/id/eprint/31685

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