材料科学技术(英文版)2021，Vol.86Issue(27) ：204-209.

Synergistic band convergence and defect engineering boost thermoelectric performance of SnTe

Ximeng Dong Wenlin Cui Wei-Di Liu Shuqi Zheng Lei Gao Luo Yue Yue Wu Boyi Wang Zipei Zhang Liqiang Chen Zhi-Gang Chen
材料科学技术(英文版)2021，Vol.86Issue(27) ：204-209.
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Synergistic band convergence and defect engineering boost thermoelectric performance of SnTe

Ximeng Dong 1Wenlin Cui 2Wei-Di Liu 3Shuqi Zheng 2Lei Gao 4Luo Yue 5Yue Wu 2Boyi Wang 2Zipei Zhang 2Liqiang Chen 6Zhi-Gang Chen7
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作者信息

  • 1. State Key Laboratory of Heavy Oil Processing,College of New Energy and Materials,China University of Petroleum,Beijing 120049,PR China;State Key Laboratory of Heavy Oil Processing,College of Science,China University of Petroleum,Beijing 102249,PR China
  • 2. State Key Laboratory of Heavy Oil Processing,College of New Energy and Materials,China University of Petroleum,Beijing 120049,PR China
  • 3. Centre for Future Materials,University of Southern Queensland,Springfield Central,Queensland 4300,Australia;School of Mechanical and Mining Engineering,The University of Queensland,Brisbane,Queensland 4072,Australia
  • 4. State Key Laboratory of Heavy Oil Processing,College of Science,China University of Petroleum,Beijing 102249,PR China
  • 5. State Key Laboratory of Advanced Power Transmission Technology,Global Energy Interconnection Research Institute Co.,Ltd.,Changping District,Beijing 102211,PR China
  • 6. State Key Laboratory of Heavy Oil Processing,College of New Energy and Materials,China University of Petroleum,Beijing 120049,PR China;Beijing Key Laboratory of Failure,Corrosion and Protection of Oil/gas Facilities and Department of Materials Science and Engineering,College of New Energy and Materials,China University of Petroleum,Beijing 102249,PR China
  • 7. Centre for Future Materials,University of Southern Queensland,Springfield Central,Queensland 4300,Australia
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Abstract

As an eco-friendly thermoelectric material,SnTe has attracted extensive attention.In this study,we use a stepwise strategy to enhance the thermoelectric performance of SnTe.Firstly,AgCl is doped into SnTe to realize band convergence and enlarge the band gap of AgCl-doped SnTe.AgCl-doping also induces dense point defects,strengthens the phonon scattering,and reduces the lattice thermal conductivity.Secondly,Sb is alloyed into AgCl-doped SnTe to further optimize the carrier concentration and simultaneously reduce the lattice thermal conductivity,leading to improved thermoelectric dimensionless figure of merit,ZT.Finally,(Sn0.81Sb0.19Te)0.93(AgCl)0.07 has approached the ZT value as high as～0.87 at 773 K,which is 272％higher than that of pristine SnTe.This study indicates that stepwise AgCl-doping and Sb-alloying can significantly improve thermoelectric performance of SnTe due to synergistic band engineering,carrier concentration optimization and defect engineering.

Key words

Thermoelectric/SnTe/Stepwise optimize/Band structure/Lattice thermal conductivity

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基金项目

This work was financially supported by the National Natural Sci-ence Foundation of China(51871240)

and Australian Research Council.Calculations were carried out in Shenzhen Cloud Comput-ing Center,National Supercomputing Center()

出版年

2021
材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI
影响因子：0.657
ISSN：1005-0302
参考文献量69
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