Characterization of spray deposited CoWO4 thin films for photovoltaic electrochemical studies
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Preparation of Cobalt tungstate (CoWO4) thin film by spray pyrolysis with ammonical solution as a precursor is presented. The phase and surface morphology characterizations have been carried out by XRD and SEM analysis. The study of optical absorption spectrum in the wavelength range 350 – 850 nm shows direct as well as indirect optical transitions in the thin film material. The d. c. electrical conductivity measurements in the temperature range 310–500 K indicate semiconducting behavior of the thin film. The thin films deposited on fluorine doped tin oxide (FTO) coated conducting glass substrates were used as a photoanode in photovoltaic electrochemical (PVEC) cell with configuration: CoWO4 | Ce4+, Ce3+ | Pt; 0.1 M in 0.1 N H2SO4. The PVEC characterization reveals the fill factor and power conversion efficiency to be 0.36 and 0.62%, respectively. The flat band potential is found to be −0.18 V (SCE).
KeywordsSpray Pyrolysis Power Conversion Efficiency Thin Film Deposition Space Charge Layer NiMoO4
One of the authors (RBK) is thankful to University Grants Commission (U. G. C.), India for the award of Emeritus Fellowship and the financial support to carry out this research work. We sincerely acknowledge Prof C H Bhosale, Shivaji University, India for providing infrastructural support to carry out few experiments.
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