The effect of multisubstitution on the thermoelectric properties of chalcogenide-based Cu2.1Zn0.9Sn1-xInxSe4 (0 <= x <= 0.1)

Chetty, Raju and Falmbigl, Matthias and Rogl, Peter and Heinrich, Patrick and Royanian, Esmaeil and Bauer, Ernst and Suwas, Satyam and Mallik, Ramesh Chandra (2013) The effect of multisubstitution on the thermoelectric properties of chalcogenide-based Cu2.1Zn0.9Sn1-xInxSe4 (0 <= x <= 0.1). In: PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 210 (11). pp. 2471-2478.

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Abstract

Quinary chalcogenide compounds Cu2.1Zn0.9Sn1-xInxSe4 (0 <= x <= 0.1) were prepared by melting (1170K) followed by annealing (773 K) for 172 h. Powder X-ray diffraction (XRD) data accompanied by electron probe microanalysis (EPMA) and Raman spectra of all the samples confirmed the formation of a tetragonal kesterite structure with Cu2FeSnS4-type. The thermoelectric properties of all the samples were measured as a function of temperature in the range of 300-780K. The electrical resistivity of all the samples exhibits metallic-like behavior. The positive values of the Seebeck coefficient and the Hall coefficient reveal that holes are the majority charge carriers. The codoping of copper and indium leads to a significant increase of the electrical resistivity and the Seebeck coefficient as a function of temperature above 650 K. The thermal conductivity of all the samples decreases with increasing temperature. Lattice thermal conductivity is not significantly modified as the doping content may infer negligible mass fluctuation scattering for copper/zinc and indium/tin substitution. Even though, the power factors (S-2/rho) of indium-doped samples Cu2.1Zn0.9Sn1-xInxSe4 (x = 0.05, 0.075) are almost the same, the maximum zT = 0.45 at 773K was obtained for Cu2.1Zn0.9Sn0.925In0.075Se4 due to its smaller value of thermal conductivity. (C) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Item Type:	Journal Article
Publication:	PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Publisher:	WILEY-V C H VERLAG GMBH
Additional Information:	Copyright for this article belongs to the WILEY-V C H VERLAG GMBH, GERMANY
Keywords:	Hall effect; Raman spectra; stoichiometry; thermoelectric effect
Department/Centre:	Division of Physical & Mathematical Sciences > Mathematics Division of Physical & Mathematical Sciences > Physics
Date Deposited:	07 Mar 2014 07:45
Last Modified:	07 Mar 2014 07:46
URI:	http://eprints.iisc.ac.in/id/eprint/48511

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