Solvent-free synthesis of Cu2ZnSnS4 nanocrystals: A facile, green, up-scalable route for low cost photovoltaic cells

Bo In Park, Yoonjung Hwang, Seung Yong Lee, Jae-Seung Lee, Jong Ku Park, Jeunghyun Jeong, Jin Young Kim, Bongsoo Kim, So Hye Cho, Doh Kwon Lee

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Efficient Cu2ZnSnSe4 (CZTSe) solar cells were fabricated with a simple, environmentally friendly, and scalable synthetic method for Cu2ZnSnS4 (CZTS) nanocrystals. CZTS nanoparticles were mechanochemically synthesized from elemental precursors on a relatively large scale (∼20 g), during which no solvents or additives were used, thus alleviating the complex process of particle synthesis. An analysis of the time evolution of the crystalline phase and morphology of precursor powders revealed that the formation of the CZTS compound was completed in 0.5 h once initiated, suggesting that the mechanochemically induced self-propagating reaction prevails. CZTS ink was prepared by dispersing the as-synthesized nanoparticles in an environmentally benign solvent (160 mg mL-1 in ethanol) without using any additives, after which it was cast onto Mo-coated glass substrates by a doctor-blade method. Subsequent reactive annealing at 560°C under a Se-containing atmosphere resulted in substantial grain growth along with the nearly complete substitution of Se. The CZTSe solar cells therefrom exhibited power conversion efficiency levels as high as 6.1% (based on the active area, 0.44 cm2) with a relatively high open-circuit voltage (0.42 V) in comparison with the bandgap energy of 1.0 eV.

Original languageEnglish
Pages (from-to)11703-11711
Number of pages9
JournalNanoscale
Volume6
Issue number20
DOIs
Publication statusPublished - 2014 Jan 1

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    Park, B. I., Hwang, Y., Lee, S. Y., Lee, J-S., Park, J. K., Jeong, J., Kim, J. Y., Kim, B., Cho, S. H., & Lee, D. K. (2014). Solvent-free synthesis of Cu2ZnSnS4 nanocrystals: A facile, green, up-scalable route for low cost photovoltaic cells. Nanoscale, 6(20), 11703-11711. https://doi.org/10.1039/c4nr02564d