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나노 구조 물리 연구단
나노구조물리 연구단
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Cu–Bi–Se-based pavonite homologue: a promising thermoelectric material with low lattice thermal conductivity

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Title
Cu–Bi–Se-based pavonite homologue: a promising thermoelectric material with low lattice thermal conductivity
Author(s)
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 Cho; Dae Joon Kang; Sung Wng Kim; Kyu Hyoung Lee
Publication Date
2013-09
Journal
JOURNAL OF MATERIALS CHEMISTRY A, v.1, no.34, pp.9768 - 9774
Publisher
ROYAL SOC CHEMISTRYROYAL SOC CHEMISTRY
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.
URI
https://pr.ibs.re.kr/handle/8788114/1254
ISSN
2050-7488
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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