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Synthesis and Characterization of ZnO Nanoparticles and Its Application to Dye Sensitized Solar Cell

In this paper, we have reported the synthesis of zinc oxide (ZnO) nanoparticles by aqueous route method and its characterization. By X-ray diffraction pattern (XRD) study it reveals that ZnO has hexagonal wurtzite structure with average particle size of 16.5 nm. From the results of
 scanning electron microscope (SEM) and Atomic force microscope (AFM) images, particles were spherical in nature with good aggregation. Stoichiometric ratio of Zinc and oxygen were almost close which was revealed from energy dispersive analysis of X-ray (EDAX). From infrared spectroscopy (FTIR),
 peak of Zn–O bond appears at 433.43 cm−1. Direct band gap of ZnO was found to be 3.36 eV estimated from UV-Vis absorption spectra. The Photovoltaic properties of DSSC sensitized by Di-tetrabutylammonium cis-bis (isothiocyanato) bis (2,2′ -bipyridyl-4,4′-dicarboxylato)
 ruthenium(II) (N-719 dye) were obtained in which photo anode is prepared by synthesized ZnO. Photocurrent (I) and photovoltage (V) was measured using designed automated load variable solar simulator and optimum solar energy to electricity conversion efficiency (η) of 2.35%
 under AM 1.5 irradiation (1000 W/m2) was observed.