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Synthesis, Characterization and Optical Properties of Novel Hierarchical Flower Like Pyrite FeS2 Particles for Low Cost Photovoltaics

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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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Keywords: GREEN SYNTHESIS; IRON PYRITE; NANOCRYSTAL INK; NANOSTRUCTURES; OPTICAL MATERIALS; PHOTOVOLTAICS

Document Type: Research Article

Publication date: 01 July 2013

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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