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A low-cost, sulfurization free approach to control optical and electronic properties of Cu2ZnSnS4 via precursor variation

Gupta, Saatviki; Whittles, Thomas J.; Batra, Yogita; Satsangi, Vibha; Krishnamurthy, Satheesh; Dhanak, Vinod R. and Mehta, Bodh Raj (2016). A low-cost, sulfurization free approach to control optical and electronic properties of Cu2ZnSnS4 via precursor variation. Solar Energy Materials and Solar Cells, 157 pp. 820–830.

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Thin films of Cu2ZnSnS4 (CZTS) were synthesized via a low cost, wet chemical technique of chemical bath deposition (CBD). In the first part of this study, the chemical composition ratio S/(Cu+Zn+Sn) was varied keeping Cu/(Zn + Sn) and Zn/Sn ratios constant to study the effect of sulfur variation. Detailed electrical and optical characterization has been carried out using UV-visible spectroscopy, x-ray diffraction, x-ray photoelectron spectroscopy, Raman spectroscopy and Kelvin probe force microscopy (KPFM) techniques. The results of the present study confirm that near ideal stoichiometry could be achieved in CZTS by adding excess thiourea in a controlled manner which eliminated the need for an additional step of sulfurization. Using the stoichiometric sample as the basis, in the second part of the study Cu/(Zn+Sn) and Zn/Sn was varied and it was found that the electronic properties of CZTS in terms of band gap, work function and valence band edge position could be controlled by precursor variation. KPFM was used to qualitatively evaluate the photoresponse of the films and the Cu-poor, Zn-rich samples showed the best photoresponse out of all the samples which has been attributed to a decrease in the CuZn type defects. The study thus demonstrates a scalable and low-cost technique to grow CZTS absorber layers for solar cells with control over its electronic properties which is important for effective device operation.

Item Type: Journal Item
Copyright Holders: 2016 Elsevier
ISSN: 0927-0248
Project Funding Details:
Funded Project NameProject IDFunding Body
Dye sensitised solar cells with functionalised graphene nanosheets. (XD-13-064-SK)Not SetUKIERI (UK-India Education and Research Initiative)
Keywords: CZTS; Precursor variation; Band structure; Kelvin probe force microscopy
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: International Development & Inclusive Innovation
Item ID: 47285
Depositing User: Satheesh Krishnamurthy
Date Deposited: 13 Sep 2016 13:54
Last Modified: 25 May 2019 06:40
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