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The dye-sensitized solar cells (DSSCs) based on nano crystalline TiO2 exhibit high power conversion efficiency one of the most commonly substitutes for low cost solar-energy-conversion devices at high temperature. ZnO is another promising metal-oxide semiconductor that can be replace TiO2 because of its higher electronic mobility as compared to TiO2 and its energy level of conduction band is similar as in TiO2. Nanocrystalline particles of ZnO were prepared by sol gel method using mesoporous electrodes for dye-sensitized solar cells. The anatase phase of ZnO has been confirmed using XRD. Transmission Electron Microscopy (TEM) has been used to confirm the particle size of the ZnO nano particles. The coating of natural dyes extracted from spinach and marry gold has been done on ZnO nano particles. The Scanning Electron Microscope and EDX study reveals the morphology and elemental composition of the pure and natural dye coated ZnO nano particles. Tauc´s plot confirmed decrease in band gap of ZnO nanoparticles with natural dye coating. Raman scattering spectra reveal active phonon modes for all of the synthesized samples. The natural dye coated nano particles are found to be better.

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Prof Dr Dalvinder Singh Grewal is a researcher and prolific writer. He is PhD in Management, Computer Science and English and has 7 PGs. His research guidance includes 18 PhD/M. Tech/MBA/ M. Phil students. He is author of 42 books and 165 papers. He is on editorial Boards of 7 international journals including SAGE.

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