Issue 34, 2013

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

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 Cu1.9Bi4.6Se8.

Graphical abstract: Cu–Bi–Se-based pavonite homologue: a promising thermoelectric material with low lattice thermal conductivity

Article information

Article type
Paper
Submitted
11 Apr 2013
Accepted
05 Jun 2013
First published
05 Jun 2013

J. Mater. Chem. A, 2013,1, 9768-9774

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

J. Y. Cho, H. Mun, B. Ryu, S. I. Kim, S. Hwang, J. W. Roh, D. J. Yang, W. H. Shin, S. M. Lee, S. Choi, D. J. Kang, S. W. Kim and K. H. Lee, J. Mater. Chem. A, 2013, 1, 9768 DOI: 10.1039/C3TA11457K

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