Cu-Bi-Se-based pavonite homologue: A promising thermoelectric material with low lattice thermal conductivity

Jung Young Cho, Hyeona Mun, Byungki Ryu, Sang Il Kim, Sungwoo Hwang, Jong Wook Roh, Dae Jin Yang, Weon Ho Shin, Sang Mock Lee, Soon Mok Choi, Dae Joon Kang, Sung Wng Kim, Kyu Hyoung Lee

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Pavonite homologues, Cux+yBi5-ySe8 (1.2 ≤ x ≤ 1.5, 0.1 ≤ y ≤ 0.4), in a polycrystalline bulk form have been synthesized using a conventional solid state sintering technique. Their thermal and electronic transport properties were evaluated for mid-temperature thermoelectric power generation applications. Structural complexity, based on unique substitutional and interstitial Cu atoms in the structure, makes this system attractive as an intrinsic low thermal conductivity material; also the band structure calculations revealed that interstitial Cu atoms generate n-type carrier conduction. Room temperature lattice thermal conductivities ranging between 0.41 W m-1 K-1 and 0.55 W m-1 K -1 were found for Cux+yBi5-ySe8; these values are comparable to those of the state-of-the-art low lattice thermal conductivity systems. These extremely low thermal conductivities combined with the power factors result in the highest ZT = 0.27 at 560 K for Cu 1.9Bi4.6Se8.

Original languageEnglish
Pages (from-to)9768-9774
Number of pages7
JournalJournal of Materials Chemistry A
Volume1
Issue number34
DOIs
Publication statusPublished - 2013 Sep 14

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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