中国物理B ›› 2018, Vol. 27 ›› Issue (6): 67201-067201.doi: 10.1088/1674-1056/27/6/067201

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Complex alloying effect on thermoelectric transport properties of Cu2Ge(Se1-xTex)3

Ruifeng Wang(王瑞峰), Lu Dai(戴璐), Yanci Yan(闫艳慈), Kunling Peng(彭坤岭), Xu Lu(卢旭), Xiaoyuan Zhou(周小元), Guoyu Wang(王国玉)   

  1. 1 Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China;
    2 College of Physics, Chongqing University, Chongqing 401331, China;
    3 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2018-03-05 修回日期:2018-04-03 出版日期:2018-06-05 发布日期:2018-06-05
  • 通讯作者: Guoyu Wang E-mail:guoyuw@cigit.ac.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos.51672270,11674040,and 11404044),the Key Research Program of Frontier Sciences,Chinese Academy of Sciences (Grant No.QYZDB-SSW-SLH016),and the Project for Fundamental and Frontier Research in Chongqing City (Grant No.CSTC2015JCYJBX0026).

Complex alloying effect on thermoelectric transport properties of Cu2Ge(Se1-xTex)3

Ruifeng Wang(王瑞峰)1,3, Lu Dai(戴璐)1,3, Yanci Yan(闫艳慈)1,2, Kunling Peng(彭坤岭)1,2, Xu Lu(卢旭)2, Xiaoyuan Zhou(周小元)2, Guoyu Wang(王国玉)1,3   

  1. 1 Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China;
    2 College of Physics, Chongqing University, Chongqing 401331, China;
    3 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-03-05 Revised:2018-04-03 Online:2018-06-05 Published:2018-06-05
  • Contact: Guoyu Wang E-mail:guoyuw@cigit.ac.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos.51672270,11674040,and 11404044),the Key Research Program of Frontier Sciences,Chinese Academy of Sciences (Grant No.QYZDB-SSW-SLH016),and the Project for Fundamental and Frontier Research in Chongqing City (Grant No.CSTC2015JCYJBX0026).

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摘要：

To enhance the thermoelectric performance of Cu2GeSe3, a series of Te-alloyed samples Cu2Ge(Se1-xTex)3 are synthesized and investigated in this work. It is found that the lattice thermal conductivity is reduced drastically for x=0.1 sample, which may be attributed to the point defects introduced by alloying. However, for samples with x ≥ 0.2, the lattice thermal conductivity increases with increasing x, which is related to a less distorted structure. The structure evolution, together with the change in carrier concentration, also leads to a systemically change in electrical properties. Finally, a zT of 0.55@750 K is obtained for the sample with x=0.3, about 62% higher than that for the pristine sample.

关键词: thermoelectric, Cu2GeSe3, alloying, distorted structure

Abstract:

To enhance the thermoelectric performance of Cu2GeSe3, a series of Te-alloyed samples Cu2Ge(Se1-xTex)3 are synthesized and investigated in this work. It is found that the lattice thermal conductivity is reduced drastically for x=0.1 sample, which may be attributed to the point defects introduced by alloying. However, for samples with x ≥ 0.2, the lattice thermal conductivity increases with increasing x, which is related to a less distorted structure. The structure evolution, together with the change in carrier concentration, also leads to a systemically change in electrical properties. Finally, a zT of 0.55@750 K is obtained for the sample with x=0.3, about 62% higher than that for the pristine sample.

Key words: thermoelectric, Cu2GeSe3, alloying, distorted structure

中图分类号:  (Thermoelectric and thermomagnetic effects)

  • 72.15.Jf
61.66.Dk (Alloys ) 72.20.Pa (Thermoelectric and thermomagnetic effects) 66.70.Df (Metals, alloys, and semiconductors)