Enhanced Efficiency of Dye-Sensitized Solar Cells Based on Polyol-Synthesized Nickel–Zinc Oxide Composites
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In the present work, nickel–zinc oxide (Ni-ZnO) particles have been fabricated through a modified polyol route at 250°C. The highly porous Ni-ZnO samples developed were of high crystalline quality and exhibited great potential for dye-sensitized solar cell (DSSC) applications on account of the quadrupled intensity values of short-circuit current density of around 1.42 mA/cm2, in contrast to 0.31 mA/cm2 for a bare zinc oxide (ZnO) device. The conversion efficiency of the Ni-ZnO DSSC was measured to be 0.416% which is ∼ 6 times higher than that a of ZnO solar cell. Detailed characterization techniques including x-ray diffraction, photoluminescence, scanning electron microscopy and energy-dispersive x-ray spectroscopy were performed on the samples. The Ni-ZnO samples were found to be crystalline with a hexagonal wurtzite lattice structure. The improved efficiency of Ni-ZnO stems from the enhanced absorption and large surface area of the composite.
KeywordsNickel–zinc oxide nanomaterials porous polyol method dye-sensitized solar cell
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This work is partly supported by NJIT. The authors would also like to thank Dr. T. N. Narayanan of the Surface Science and Interface Engineering Group of TIFR Centre for Interdisciplinary Sciences, Hyderabad, India, and Dr. Deepak Kumar Pattanayak of the Chlor-Alkali Division, CSIR-CECRI, Karaikudi, Tamil Nadu, India, for their support and fruitful discussions during the work. The authors do not have any competing financial support.
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