Thin Film ZnO Coated on FTO/TiO2 as an Anti Reflection Coatingfor EnhancingVisible Light Harversting in Dye Sensitized Solar Cells System

ZnOmaterial has unique electrical and optical properties that many important applications, including as an anti-reflection coating in dye sensitized solar cells. Flat anti-reflective coatings (ARC) made of ZnO on top to improve the optical properties of the coating. In this study, ZnO nanoparticle were coated with TiO₂ nanolayers by a simple wet chemical route. TiO₂ nanorods coated ZnO nanoparticle was synthesized by two step i.e. (1) base hydrolysis and polymerization of TiO₂ (2) ZnO nanoparticle were coated with a TiO₂ layer. The TiO₂ coated ZnO prepared was characterized by X-ray diffraction (XRD), Reflectance spectroscopy, SEM and TEM. ZnO annealed at a temperature of 400^oC have the greatest crystal size than annealedat a temperature of 500 °C and 600 °C. While, the Reflectance (%R)properties shows that the higher annealing temperature of ZnO preparations, the higher of %R value of ZnO thin layer. The ZnO prepared by annealed at 400^oCgain a good performance of the lowest reflectance value. The difference properties are due to differences of light scattering resulting from the crystal size effect. The crystals size that have a good performance as an anti-reflection is around 20 nm, result study of ZnOannealed at 400 °C. TEM nanograph shows that the synthesized ZnO have spherical morphology. The optimum performance ofDSSCs was conducted using the photoanode ZnO-coated TiO₂at present 10%APTMS as surface modifier anchor dye group. Bythe addition of ARC we have been capable improve cell performance so that cells achieve an efficiency of 1.13%.