Effect of the Amount of Vacancies on the Thermoelectric Properties of Cu–Ga–Te Ternary Compounds

• Plirdpring Theerayuth

  Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University Thermoelectric and Nanotechnology Research Center, Faculty of Science and Technology, Rajamangala University of Technology Suvarnabhumi

• Kurosaki Ken

  Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University

• Kosuga Atsuko

  Nanoscience and Nanotechnology Research Center, Research Organization for the 21st Century, Osaka Prefecture University

• Ishimaru Manabu

  Institute of Scientific and Industrial Research, Osaka University

• Harnwunggmoung Adul

  Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University Thermoelectric and Nanotechnology Research Center, Faculty of Science and Technology, Rajamangala University of Technology Suvarnabhumi

• Sugahara Tohru

  Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University

• Ohishi Yuji

  Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University

• Muta Hiroaki

  Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University

• Yamanaka Shinsuke

  Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University Research Institute of Nuclear Engineering, University of Fukui

Bibliographic Information

Other Title

• Effect of the Amount of Vacancies on the Thermoelectric Properties of Cu–Ga–Te Ternary Compounds

Abstract

The Cu–Ga–Te ternary compounds: Cu₃Ga₅Te₉, Cu₂Ga₄Te₇, CuGa₃Te₅, CuGa₅Te₈, and CuGaTe₂ have zinc-blende or chalcopyrite structure. The compounds except for CuGaTe₂ contain vacancies in the cation site due to the valence mismatch between cation and anion, and the vacancy concentration is different between these compounds. Here we investigated the effect of the amount of vacancies on the thermoelectric (TE) properties of the Cu–Ga–Te ternary compounds. At room temperature, the presence of vacancies reduced the Hall mobility (μ_H) and the lattice thermal conductivity (κ_lat), showing that the vacancies scattered both carriers and phonons. It was found that the decreasing rate of the μ_H was larger than that of the κ_lat. Therefore, the presence of vacancies degraded the TE performance of the Cu–Ga–Te ternary compounds. In other words, CuGaTe₂ without vacancies would show the best TE figure of merit. The room temperature ZT values for Cu₃Ga₅Te₉, Cu₂Ga₄Te₇, CuGa₃Te₅, CuGa₅Te₈, and CuGaTe₂ were 2.0 × 10⁻², 2.4 × 10⁻², 8.9 × 10⁻³, 1.3 × 10⁻², and 5.6 × 10⁻³, respectively.

Journal

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 53 (7), 1212-1215, 2012

  The Japan Institute of Metals and Materials

Keywords

• thermoelectric
• copper–gallium–tellurium compounds
• vacancy
• thermal conductivity
• electrical resistivity
• Seebeck coefficient

Details

• CRID: 1390282679225668480
• NII Article ID: 10030791694
• NII Article ID: 130004824912
• NII Book ID: AA1151294X
• DOI: 10.2320/matertrans.e-m2012810
• COI: 1:CAS:528:DC%2BC38XhtlansbnO
• ISSN: 13475320
• ISSN: 13459678
• NDL BIB ID: 023781411
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I023781411
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/53/7/53_E-M2012810/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed