Enhancement of thermoelectric performance by tuning selenium content in the Cu2SnSe3 compound

Gurukrishna, K and Rao, Ashok and Jiang, Zhao-Ze and Kuo, Yung-Kango (2020) Enhancement of thermoelectric performance by tuning selenium content in the Cu2SnSe3 compound. Intermetallics, 122. ISSN 0966-9795

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Abstract

To investigate the thermoelectric properties, we have attempted to tune selenium content in Cu2SnSe3-δ ( 0.04 � δ �0.1) compounds synthesized via the conventional solid-state reaction. Electrical and thermal properties are presented in the low and near room temperature regime (10–350 K). The lowest electrical resistivity is observed for the compound with δ ¼ 0.08. The electron-phonon coupling and the presence of small polarons are experimentally validated from temperature-dependent electrical and thermal transport data. A decrease in the Seebeck coefficient along with carrier concentration is observed, verifying the linear electron band dispersion. A downward shift of the Fermi level deep into the valence band is realized in the case of non-stoichiometric samples, thereby reducing the Seebeck coefficient. A maximum power factor of ~50 μWmK 2 is achieved for the sample with δ ¼ 0.04, which is about twice that of the pristine compound. The highest ZT of ~0.01 is obtained for the compound with δ ¼ 0.08. The observed results suggest that stoichiometry plays a vital role in tuning the thermoelectric properties in the Cu2SnSe3 compound.

Item Type: Article
Uncontrolled Keywords: Functional alloys Thermoelectric properties Powder metallurgy Point defects
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 03 Sep 2020 05:06
Last Modified: 03 Sep 2020 05:06
URI: http://eprints.manipal.edu/id/eprint/155594

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