材料科学技术(英文版)2022，Vol.106Issue(11) ：249-256.

Se-alloying reducing lattice thermal conductivity of Geo.95Bio.05Te

De-Zhuang Wang Wei-Di Liu Xiao-Lei Shi Han Gao Hao Wu Liang-Cao Yin Yuewen Zhang Yifeng Wang Xueping Wu Qingfeng Liu Zhi-Gang Chen
材料科学技术(英文版)2022，Vol.106Issue(11) ：249-256.
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Se-alloying reducing lattice thermal conductivity of Geo.95Bio.05Te

De-Zhuang Wang 1Wei-Di Liu 2Xiao-Lei Shi 2Han Gao 3Hao Wu 1Liang-Cao Yin 1Yuewen Zhang 3Yifeng Wang 4Xueping Wu 5Qingfeng Liu 6Zhi-Gang Chen2
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作者信息

  • 1. State Key Laboratory of Materials-Oriented Chemical Engineering,College of Chemical Engineering,Nanjing Tech University,Nanjing,211800,China
  • 2. Centre for Future Materials,University of Southern Queensland,Springfield Central,QLD 4300,Australia;School of Mechanical and Mining Engineering,The University of Queensland,Brisbane,QLD 4072,Australia
  • 3. Key Laboratory of Material Physics of Ministry of Education,School of Physics and Microelectronics,Zhengzhou University,Zhengzhou,450052,China
  • 4. College of Materials science and engineering,Nanjing Tech University,Nanjing,211800,China
  • 5. School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei,230009,China
  • 6. State Key Laboratory of Materials-Oriented Chemical Engineering,College of Chemical Engineering,Nanjing Tech University,Nanjing,211800,China;CAS Key Laboratory of Carbon Materials,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan,030001,China
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Abstract

High lattice thermal conductivity of intrinsic GeTe limits the wide application of GeTe-based thermo-electrics.Recently,the optimization of GeTe-based thermoelectric materials has been focusing on re-ducing lattice thermal conductivity via strengthening phonon scattering.In this study,we systematically studied thermoelectric properties of Se-alloyed Ge0.95Bi0.05Te via theoretical calculations,structural char-acterizations,and performance evaluations.Our results indicate that Se-alloying can induce dense point defects with mass/strain-field fluctuations and correspondingly enhance point defect phonon scattering of the Ge0.95Bi0.05Te matrix.Se-alloying might also change chemical bonding strength to introduce resonant states in the base frequency of Ge0.95Bi0.05Te matrix,which can strengthen Umklapp phonon scattering.Finally,a decreased lattice thermal conductivity from～1.02 W m-1 K-1 to～0.65 W mr1 K-1 at 723 K is obtained in Ge0.95Bi0.05Te1-xSex pellets with increasing the Se content from 0 to 0.3.A peak figure of merit of～1.6 at 723 K is achieved in Ge0.95Bi0.05Te0.7Se0.3 pellet,which is～77％higher than that of pris-tine GeTe.This study extends the understanding on the thermoelectric performance of GeTe.

Key words

Thermoelectric/GeTe/Se-alloying/Lattice thermal conductivity

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基金项目

National Natural Science Foundation of China(51972170)

State Key Laboratory of Materials-Oriented Chemical Engineering(ZK201812)

CAS Key Laboratory of Carbon Materials(KLCMKFU2002)

Pri-ority Academic Program Development of Jiangsu Higher Education InstitutionsPAPD()

Jiangsu Specially-Appointed Professor Pro-gramZGC thanks the finacial support from the Australian Research Council,USQ start()

出版年

2022
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58
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