Iron pyrite thin films deposited via non-vacuum direct coating of iron-salt/ethanol-based precursor solutions

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We report a new approach for fabricating pyrite (cubic FeS2) thin films via a non-vacuum direct solution coating route using iron-acetate dissolved in ethanol as a precursor solution. The precursor ink is deposited by spin coating and annealed in air at 300 degrees C to produce amorphous iron oxide films. Subsequent heat treatment of the iron oxide films in a sulfur environment at 450 degrees C results in the formation of phase-pure, carbon-free, large-grained pyrite films. In particular, the phase evolution during sulfurization is systematically investigated, focusing on the effects of the principal experimental variables such as temperature and pressure. As the temperature increases, iron oxide first begins to transform into marcasite (orthorhombic FeS2) and then is completely converted to pyrite. Further increasing the temperature above 500 degrees C induces the decomposition of pyrite into pyrrhotite (Fe1-xS) and sulfur vapor. The decomposition is also strongly dependent on the partial pressure of sulfur: as the pressure decreases, the decomposition occurs at lower temperature. The synthesized single-phase pyrite films show an indirect band gap of 0.94 eV, a strong anodic photocurrent based on photo-electrochemical measurements, and n-type semiconducting properties based on Mott-Schottky analysis. Thus, the films demonstrate great potential for use as absorbing layers in solar cells.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2014-11
Language
English
Article Type
Article
Keywords

CHEMICAL-VAPOR-DEPOSITION; SOL-GEL METHOD; FES2 FILMS; OPTICAL-PROPERTIES; N-FES2 PYRITE; CELLS; SULFURIZATION; NANOCRYSTALS; TEMPERATURE; EFFICIENCY

Citation

JOURNAL OF MATERIALS CHEMISTRY A, v.2, no.42, pp.17779 - 17786

ISSN
2050-7488
DOI
10.1039/c4ta03397c
URI
http://hdl.handle.net/10203/194720
Appears in Collection
MS-Journal Papers(저널논문)
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