A strategy for boosting the thermoelectric performance of famatinite Cu3SbS4

Taiki Tanishita, Koichiro Suekuni, Hirotaka Nishiate, Chul Ho Lee, Michitaka Ohtaki

Research output: Contribution to journalArticle

Abstract

Famatinite Cu3SbS4 has attracted attention for its potential application in thermoelectric (TE) contexts. In this work, we report the impacts of co-substituting Ge and P for Sb on TE properties. Melting and heat treatment methods were adopted to synthesize samples of Cu3Sb1-x-yGexPyS4 (x ≤ 0.4, y ≤ 0.3). In this system, Ge functioned as an acceptor for doping a hole to the valence band, which led to enhancement of the TE power factor. Contrastingly, P barely altered the electronic structure. Furthermore, both Ge and P acted as point defects, which effectively decreased lattice thermal conductivity. The combined effects of the co-substitution gave rise to an enhanced dimensionless figure of merit, ZT, of 0.67 at 673 K.

Original languageEnglish
Pages (from-to)2081-2086
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume22
Issue number4
DOIs
Publication statusPublished - Jan 1 2020

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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