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Research Article | Open Access

Enhanced thermoelectric properties of hydrothermally synthesized n-type Se&Lu-codoped Bi2Te3

Xiaolei SHIa,†, Xin AIb,†, Qihao ZHANGc,d( ), Xiaofang LUa, Shijia GUe, Li SUa, Lianjun WANGa,f( ), Wan JIANGa,e
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
College of Information Science and Technology, Donghua University, Shanghai 201620, China
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Institute of Functional Materials, Donghua University, Shanghai 201620, China
Engineering Research Center of Advanced Glasses Manufacturing Technology, Ministry of Education, Shanghai 201620, China

† Xiaolei Shi and Xin Ai contributed equally to this work.

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Abstract

N-type Se&Lu-codoped Bi2Te3 nanopowders were prepared by hydrothermal method and sintered by spark plasma sintering technology to form dense samples. By further doping Se element into Lu-doped Bi2Te3 samples, the thickness of the nanosheets has the tendency to become thinner. The electrical conductivity of Lu0.1Bi1.9Te3-xSex material is reduced with the increasing Se content due to the reduced carrier concentration, while the Seeback coefficient values are enhanced. The lattice thermal conductivity of the Lu0.1Bi1.9Te3-xSex is greatly reduced due to the introduced point defects and atomic mass fluctuation. Finally, the Lu0.1Bi1.9Te2.7Se0.3 sample obtained a maximum ZT value of 0.85 at 420 K. This study provides a low-cost and simple low-temperature method to mass production of Se&Lu-codoped Bi2Te3 with high thermoelectric performance for practical applications.

Keywords

thermoelectric materialn-typebismuth telluridehydrothermal synthesisco-doping

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Journal of Advanced Ceramics
Volume 9 Issue 4,
August 2020
Pages 424-431
DOI: 10.1007/s40145-020-0382-9

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SHI X, AI X, ZHANG Q, et al. Enhanced thermoelectric properties of hydrothermally synthesized n-type Se&Lu-codoped Bi2Te3. Journal of Advanced Ceramics, 2020, 9(4): 424-431. https://doi.org/10.1007/s40145-020-0382-9

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Received: 20 January 2020
Revised: 10 April 2020
Accepted: 22 April 2020
Published: 15 May 2020
© The Author(s) 2020

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