Thermoelectric properties of Cu2Se1-: XTex solid solutions

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

DOI

  • Kunpeng Zhao, Shanghai Institute of Ceramics Chinese Academy of Sciences, Chinese Academy of Sciences
  • ,
  • Mengjia Guan, Shanghai Institute of Ceramics Chinese Academy of Sciences, Chinese Academy of Sciences
  • ,
  • Pengfei Qiu, Shanghai Institute of Ceramics Chinese Academy of Sciences
  • ,
  • Anders B. Blichfeld, Norges teknisk-naturvitenskapelige universitet, Trondheim
  • ,
  • Espen Eikeland
  • Chenxi Zhu, Shanghai Institute of Ceramics Chinese Academy of Sciences
  • ,
  • Dudi Ren, Shanghai Institute of Ceramics Chinese Academy of Sciences
  • ,
  • Fangfang Xu, Shanghai Institute of Ceramics Chinese Academy of Sciences
  • ,
  • Bo B. Iversen
  • Xun Shi, Shanghai Institute of Ceramics Chinese Academy of Sciences
  • ,
  • Lidong Chen, Shanghai Institute of Ceramics Chinese Academy of Sciences

Binary Cu2Se and Cu2Te have gained great attention recently because of their interesting and abnormal physical properties, such as ultralow thermal conductivity, high carrier mobility, large effective mass of carriers and excellent thermoelectric performance. In this study, we find that these two compounds are completely miscible throughout the studied composition range. The trigonal structure of Cu2Se is maintained when the Te content x is 0.2, but a new trigonal structure is formed when the Te content x is between 0.3 and 0.7. The carrier concentration is greatly improved when increasing the Te content in Cu2Se1-xTex solid solutions, resulting in a much reduced electrical resistivity and Seebeck coefficient in the whole temperature range as compared with those of binary Cu2Se. The total thermal conductivity is inversely increased due to the contribution from enhanced carrier thermal conductivity. As a result, the overall thermoelectric performance of Cu2Se1-xTex solid solutions lies between Cu2Se and Cu2Te. We also find that the quality factor of Cu2Se1-xTex is higher than those of most typical thermoelectric materials. Thus the thermoelectric performance can be further improved if the intrinsically high hole carrier concentrations can be reduced in Cu2Se1-xTex.

Original languageEnglish
JournalJournal of Materials Chemistry A
Volume6
Issue16
Pages (from-to)6977-6986
Number of pages10
ISSN2050-7488
DOIs
Publication statusPublished - 1 Jan 2018

See relations at Aarhus University Citationformats

ID: 126957119