Thermoelectric properties of copper selenide with ordered selenium layer and disordered copper layer

Yu, Bo; Liu, Weishu; Chen, Shuo; Wang, Hui; Wang, Hengzhi; Chen, Gang; Ren, Zhifeng

doi:10.1016/j.nanoen.2012.02.010

Thermoelectric properties of copper selenide with ordered selenium layer and disordered copper layer

Journal Article · Tue Mar 06 00:00:00 EST 2012 · Nano Energy

DOI:https://doi.org/10.1016/j.nanoen.2012.02.010· OSTI ID:1386802

Yu, Bo ^[1]; Liu, Weishu ^[1]; Chen, Shuo ^[1]; Wang, Hui ^[1]; Wang, Hengzhi ^[1]; Chen, Gang ^[2]; Ren, Zhifeng ^[1]

Boston College, Chestnut Hill, MA (United States). Dept. of Physics
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Mechanical Engineering

Thermoelectric figure-of-merit (ZT) of ~1.6 at 700 °C is achieved in β-phase copper selenide (Cu₂Se) made by ball milling and hot pressing. The β-phase of such material possesses a natural superlattice-like structure that combines ordered selenium (Se) and disordered copper (Cu) layers in its unit cell, resulting in a low lattice thermal conductivity of 0.4–0.5 W m^-1 K^-1. A λ-shaped specific heat peak indicates a phase transition from cubic β-phase to tetragonal α-phase at around 140 °C upon cooling and vice versa. An abnormal decrease in specific heat with increasing temperature was also observed here due to the increased random motion of disordered Cu atoms. These features indicate that β-phase Cu₂Se could be potentially an interesting thermoelectric material, competing with other conventional thermoelectric materials.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0001299

OSTI ID:: 1386802

Alternate ID(s):: OSTI ID: 1066934

Journal Information:: Nano Energy, Journal Name: Nano Energy Journal Issue: 3 Vol. 1; ISSN 2211-2855

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Thermoelectric properties of copper selenide with ordered selenium layer and disordered copper layer

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