Enhanced thermoelectric performance of ultrathin Bi2Se3 nanosheets through thickness control

Hong, Min, Chen, Zhi-Gang, Yang, Lei, Han, Guang and Zou, Jin (2015) Enhanced thermoelectric performance of ultrathin Bi2Se3 nanosheets through thickness control. Advanced Electronic Materials, 1 6: 1500025-1-1500025-9. doi:10.1002/aelm.201500025


Author Hong, Min
Chen, Zhi-Gang
Yang, Lei
Han, Guang
Zou, Jin
Title Enhanced thermoelectric performance of ultrathin Bi2Se3 nanosheets through thickness control
Formatted title
Enhanced thermoelectric performance of ultrathin Bi2Se3 nanosheets through thickness control
Journal name Advanced Electronic Materials   Check publisher's open access policy
ISSN 2199-160X
Publication date 2015-06-01
Year available 2015
Sub-type Article (original research)
DOI 10.1002/aelm.201500025
Open Access Status Not Open Access
Volume 1
Issue 6
Start page 1500025-1
End page 1500025-9
Total pages 9
Place of publication Weinheim, Germany
Publisher Wiley
Language eng
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(-1) K-1), and enhanced powder factor (4.71 x 10(-4) W m(-1) K-2 with a Seebeck coeffi cient of -155.32 mu V K-1 and an electrical conductivity of 1.96 x 10(4) 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.
Formatted 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.
Keyword Bi2Te3 nanosheets
Band structures
Kane band models
Thickness controls
Thermoelectric
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID DP150100056
2011002414
Institutional Status UQ

 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 19 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 12 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Sun, 16 Aug 2015, 10:15:42 EST by System User on behalf of Centre for Microscopy and Microanalysis