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

Title
Solvent-free synthesis of Cu2ZnSnS4 nanocrystals: a facile, green, up-scalable route for low cost photovoltaic cells
Authors
박보인황윤정이승용이재승박종구정증현김진영김봉수조소혜이도권
Keywords
CZTS; solar cells; mechanochemical; nanoparticle; CZTSe
Issue Date
2014-10
Publisher
Nanoscale
Citation
VOL 6, NO 20, 11703-11711
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.
URI
http://pubs.kist.re.kr/handle/201004/48188
ISSN
20403364
Appears in Collections:
KIST Publication > Article
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