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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