Research Article

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2016, 9(1): 117–127

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https://doi.org/10.1007/s12274-015-0892-x

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, and Yue Wu5 (*)

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1 School of Chemical Engineering, Purdue University, West Lafayette, IN 47907, USA
2 Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, USA
3 School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA
4 Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA
5 Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA
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

Keywords: Bi2Te3, Se doping, solution synthesis, nanostructure, thermoelectric
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  • Abstract
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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.
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Thermoelectric properties of solution-synthesized n-type Bi2Te3 nanocomposites modulated by Se: An experimental and theoretical study. Nano Res. 2016, 9(1): 117–127 https://doi.org/10.1007/s12274-015-0892-x

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