Enhanced Thermoelectric Performance of Ultrathin Bi2Se3 Nanosheets through Thickness Control. (20th April 2015)

• Record Type: Journal Article
• Authors: Hong, Min; Chen, Zhi‐Gang; Yang, Lei; Han, Guang; Zou, Jin
• Is Part Of: Advanced Electronic Materials. Volume 1:Number 6(2015:Jun.)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2015-04-20
• Subjects: Materials -- Electric properties -- Periodicals; Materials science -- Periodicals; Magnetic materials -- Periodicals; Electronic apparatus and appliances -- Periodicals; 537
• DOI: 10.1002/aelm.201500025
• Languages: English
• ISSNs: 2199-160X

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>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.</p> </abstract>