Prasad, K. Shyam and Rao, Ashok and Tyagi, Kriti and Chauhan, Nagendra Singh and Gahtori, Bhasker and Dhar, Ajay (2017) Enhanced thermoelectric performance of Pb doped Cu2SnSe3 synthesized employing spark plasma sintering. Physica B: Condensed Matter, 512. pp. 39-44. ISSN 0921-4526

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Abstract

We report an enhancement in the thermoelectric performance of Cu2SnSe3 alloy on Pb doping, owing to a sharp increase in its power factor. The powder XRD pattern of all samples of Cu2Sn1-xPbxSe3 (0 <= x <= 0.03), prepared using solid state reaction, exhibited a cubic structure with a space group of F (4) over bar 3m. The results show that temperature dependent electricalresistivity, rho(T) increases with increasing temperature thereby demonstrating that the samples display heavily doped semiconducting nature, which could be satisfactorily described by small polaron hopping model in the whole temperature range of measurement for all the samples. Both the resistivity and the Seebeck coefficient are reduced with 2 vol% Pb doping. The thermal conductivity of all the samples reduces with increasing temperature. Despite a decrease in Seebeck coefficient the power factor shows an increase on Pb doping, owing to a sharp surge in the electrical conductivity which results in an enhanced Z(Tmax) similar to 0.64 at 700 K for an optimized composition of Cu2Sn0.98Pb0.02Se3, which is nearly twice the value of the corresponding undoped counterpart.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	06 Sep 2018 11:14
Last Modified:	06 Sep 2018 11:14
URI:	http://npl.csircentral.net/id/eprint/2701

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