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Issue 18, 2014
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Solution-processed Cu2ZnSnS4 absorbers prepared by appropriate inclusion and removal of thiourea for thin film solar cells

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Abstract

We studied how to effectively add/remove organic chemicals to/from CZTS precursor thin films to prepare uniform CZTS thin films that show optimal properties. We used multi-functional thiourea, as both a stabiliser and a source of sulphur, to prepare the precursor solutions. This is because it forms complexes with metal chlorides, which stabilise the CZTS precursor solutions and enable CZTS thin films to be spin-coated onto substrates thereby enabling fabrication of CZTS absorbers. However, the excess thiourea, required to stabilise the CZTS precursor solutions, induced the formation of a ZnS secondary phase in the CZTS thin films, which deteriorated the photovoltaic properties of the CZTS solar cells. We therefore pre-annealed the thin films to inhibit ZnS formation. We used the thiourea-stabilized CZTS precursor solutions and simple solution processing techniques to prepare CZTS precursor thin films, and optimized the pre-annealing temperature to fabricate CZTS solar cells that showed 5.29% efficiency.

Graphical abstract: Solution-processed Cu2ZnSnS4 absorbers prepared by appropriate inclusion and removal of thiourea for thin film solar cells

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Publication details

The article was received on 27 Sep 2013, accepted on 15 Jan 2014 and first published on 16 Jan 2014


Article type: Paper
DOI: 10.1039/C3RA45441J
Author version available: Download Author version (PDF)
Citation: RSC Adv., 2014,4, 9118-9125
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    Solution-processed Cu2ZnSnS4 absorbers prepared by appropriate inclusion and removal of thiourea for thin film solar cells

    S. Park, S. Sung, D. Son, D. Kim, M. Gansukh, H. Cheong and J. Kang, RSC Adv., 2014, 4, 9118
    DOI: 10.1039/C3RA45441J

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