Synthesis, Characterization and Optical Properties of Novel Hierarchical Flower Like Pyrite FeS2 Particles for Low Cost Photovoltaics
Monodispersed air stable hierarchical FeS2 particles have been synthesized using a green synthesis method in aqueous solution. The as-synthesized particles have been characterized using powder XRD and Raman spectroscopy and confirmed the formation of cubic pyrite phase excluding the possible presence of other Fe–S phases. The newly developed structures have flower like morphology with narrow size distribution as confirmed by TEM, HRTEM and SEM imaging. The specific topological arrangement realized arises from the crystallographic octahedron form and the growth in particularly 〈111〉 direction. The overall hierarchical flower like particles are formed from FeS2 nanosheets by oriented attachment and confirmed by various controlled experiments. Optical studies on thin film and solution (stable nanocrystal ink) show high absorbance in the entire visible and near-IR wavelength making them potential candidate as absorber in solar cells. A typical indirect band gap of FeS2 is seen with little blue shift due to nanoparticle nature of the building blocks of the hierarchical flowers.
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Document Type: Research Article
Publication date: 01 July 2013
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