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Fabrication and Characterization of Low-Cost, Large-Area Spray Deposited Cu2ZnSnS4 Thin Films for Heterojunction Solar Cells

Published online by Cambridge University Press:  28 August 2013

Sandip Das ,
Kelvin J. Zavalla ,
M. A. Mannan  and
Krishna C Mandal
Sandip Das
Affiliation:
Department of Electrical Engineering, University of South Carolina, Columbia, SC 29208, USA.
Kelvin J. Zavalla
Affiliation:
Department of Electrical Engineering, University of South Carolina, Columbia, SC 29208, USA.
M. A. Mannan
Affiliation:
Department of Electrical Engineering, University of South Carolina, Columbia, SC 29208, USA.
Krishna C Mandal*
Affiliation:
Department of Electrical Engineering, University of South Carolina, Columbia, SC 29208, USA.
*
*Email: mandalk@cec.sc.edu
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Abstract

Large-area Cu2ZnSnS4 (CZTS) thin films were deposited by low-cost spray pyrolysis technique on Mo-coated soda-lime glass (SLG) substrates at varied substrate temperatures of 563-703°K. Deposition conditions were optimized to obtain best quality films and effect of post deposition thermal processing of the as-deposited films under H2S ambient were investigated. Structural, morphological, and compositional characterization of as-deposited and H2S treated CZTS absorber layers were carried out by x-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and energy dispersive x-ray analysis (EDX). Optical and electrical properties were measured by UV-Vis spectroscopy, van der Pauw, and Hall-effect measurements. Films grown at ∼360°C substrate temperature showed superior optoelectronic properties, improved stoichiometry and smoother morphology compared to films grown at much higher or lower temperatures. Film properties were significantly improved after the H2S processing. Our results show that large area high quality CZTS films can be fabricated by low-cost spray pyrolysis technique for high throughput commercial production of CZTS based heterojunction solar cells.

Keywords

thin filmspray depositionphotovoltaic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1538: Symposium C – Compound Semiconductors: Thin-Film Photovoltaics, LEDs and Smart Energy Controls , 2013 , pp. 115 - 121
Copyright
Copyright © Materials Research Society 2013 

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