Jump to main content
Jump to site search

Issue 7, 2016
Previous Article Next Article

Effect of Zn substitution at a Cu site on the transport behavior and thermoelectric properties in Cu3SbSe4

Author affiliations

Abstract

An attempt is made in this study to find the effect of substitution of Zn at a Cu site in copper antimony selenide (Cu3−xZnxSbSe4; x = 0, 0.5, 1.0), prepared using a conventional melt growth followed by spark plasma sintering, with the aim of investigating the transport behavior and thermoelectric properties. A single parabolic band model with acoustic phonon scattering approximation was used to explain the transport phenomenon and density of states effective mass. The intrinsic samples (x = 0) show unipolar transport with holes as majority charge carriers. It was found that both the effective mass and carrier concentration decreased with increase in Zn concentration. From thermal conductivity measurements, evidence of bipolar carrier transport is found above 475 K in Zn containing samples and thus the possibility of involvement of other scattering mechanisms along with acoustic phonons is not ruled out. The Seebeck coefficient of the samples containing Zn show a negative value above 600 K whereby it is observed that substitution of Cu with Zn contributes electronic charge carriers in Cu3−xZnxSbSe4. The value of the thermoelectric figure of merit (ZT) in Zn substituted samples first increases till 475 K and then starts to decrease sharply due to bipolar charge transport, however, Cu2.5Zn0.5SbSe4 (x = 0.5) shows the highest ZT compared to other samples.

Graphical abstract: Effect of Zn substitution at a Cu site on the transport behavior and thermoelectric properties in Cu3SbSe4

Back to tab navigation

Supplementary files

Article information


Submitted
12 Oct 2015
Accepted
04 Jan 2016
First published
07 Jan 2016

RSC Adv., 2016,6, 5528-5534
Article type
Paper

Effect of Zn substitution at a Cu site on the transport behavior and thermoelectric properties in Cu3SbSe4

A. Kumar, P. Dhama, D. S. Saini and P. Banerji, RSC Adv., 2016, 6, 5528
DOI: 10.1039/C5RA21165D

Social activity

Search articles by author

Spotlight

Advertisements