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Research Article

Thermoelectric properties of solution-synthesized n-type Bi2Te3 nanocomposites modulated by Se: An experimental and theoretical study

Haiyu Fang1,†, Je-Hyeong Bahk2,‡, Tianli Feng3, Zhe Cheng4, Amr M. S. Mohammed2, Xinwei Wang4, Xiulin Ruan3, Ali Shakouri2, Yue Wu5( )
School of Chemical EngineeringPurdue UniversityWest LafayetteIN47907USA
Birck Nanotechnology CenterPurdue UniversityWest LafayetteIN47907USA
School of Mechanical EngineeringPurdue UniversityWest LafayetteIN47907USA
Department of Mechanical EngineeringIowa State UniversityAmesIA50011USA
Department of Chemical and Biological EngineeringIowa State UniversityAmesIA50011USA

† Present address: Materials Research Laboratory, UC Santa Barbara, Santa Barbara, CA 93106, USA

‡ Present address: Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221, USA

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Abstract

We report the investigation of the thermoelectric properties of large-scale solution-synthesized Bi2Te3 nanocomposites prepared from nanowires hotpressed into bulk pellets. A third element, Se, is introduced to tune the carrier concentration of the nanocomposites. Due to the Se doping, the thermoelectric figure of merit (ZT) of the nanocomposites is significantly enhanced due to the increased power factor and reduced thermal conductivity. We also find that thermal transport in our hot-pressed pellets is anisotropic, which results in different thermal conductivities along the in-plane and cross-plane directions. Theoretical calculations for both electronic and thermal transport are carried out to establish fundamental understanding of the material system and provide directions for further ZT optimization with adjustments to carrier concentration and mobility.

Keywords

Bi2Te3Se dopingsolution synthesisnanostructurethermoelectric

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Nano Research
Volume 9 Issue 1,
January 2016
Pages 117-127
DOI: 10.1007/s12274-015-0892-x
Cite this article:
Fang H, Bahk J-H, Feng T, et al. Thermoelectric properties of solution-synthesized n-type Bi2Te3 nanocomposites modulated by Se: An experimental and theoretical study. Nano Research, 2016, 9(1): 117-127. https://doi.org/10.1007/s12274-015-0892-x
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Received: 20 July 2015
Revised: 18 August 2015
Accepted: 05 September 2015
Published: 29 October 2015
© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2015
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