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Palve B.M.,University of Pune | Palve B.M.,Djm Commerce And Bns Science College Sangamner | Jadkar S.R.,University of Pune | Pathan H.M.,University of Pune
Journal of Materials Science: Materials in Electronics | Year: 2016

The CuS nanocrystal powders were prepared by a simple chemical route at room temperature and the effect of the solution concentration on properties of CuS nanocrystal were investigated. These CuS nanocrystals were prepared from the solution in which the ratios of copper to thiosulphate were varied from 1:1 to 1:5. X-ray diffraction patterns suggests that the prepared CuS nanocrystals of ratios 1:3–1:5 were very close to the covellite form of copper sulphide. The optical spectra reveal that the powder 1:3, 1:4 and 1:5 shows high absorbance in the visible region. Raman spectra confirmed the covellite form of the copper sulphide nanocrystal. Scanning electron microscopy revealed the formation of agglomerated CuS hexagonal and flex with significant morphological deviation through sulphur concentration. Photoluminescence spectra indicate the concentrations of sulphur increases then the PL emission intensity is also increased. From TEM images, the morphology of the Copper sulphide powder get changes with increasing volumetric ratio of Cu/S. Mechanism of the CuS nanocrystal formation and phase transition is also discussed. © 2016 Springer Science+Business Media New York

Arote S.,University of Pune | Arote S.,Djm Commerce And Bns Science College Sangamner | Tabhane V.,University of Pune | Jadkar S.,University of Pune | Pathan H.,University of Pune
Indian Journal of Physics | Year: 2014

Tin oxide (SnO2) nanostructures were synthesized by simple chemical precipitation route and SnO2 photoelectrode films were fabricated on fluorine doped SnO2 substrate. Using Rose Bengal dye as a sensitizer, scanning electron microscopic analysis was performed for the unsensitized and sensitized SnO2 photoelectrodes to study the changes in surface morphology. Optical absorption studies for Rose Bengal dye in solution and the photoelectrodes sensitized with it were conducted using UV-vis spectrophotometer. Effects of dye loading time on photovoltaic characteristics of the cell fabricated using the sensitized photoelectrode were studied. The highest performance of device was obtained for the photoelectrode with 24 h dye loading time which showed the V OC, J SC and FF of about 385 mV, 0.874 mA/cm2 and 78 %, respectively. © 2014 Indian Association for the Cultivation of Science.

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