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Doped nanostructured TiO2 for photovoltaic application

Nanostructured TiO 2 is known as a material with excellent physical and chemical properties, as high specific surface area, high photo-activity and environmental stability. It was studied for application in solar energy, primarily as electron transporting layer in perovskite and dye sensitized solar cells. In this work we studied the TiO 2 doped with samarium with the aim to improve TiO 2 optical properties and photovoltaic performances. The influence of doping to TiO 2 morphology and structure were correlated to photovoltaic performances. Pure TiO 2 and doped with 1% Sm samples were prepared by sol-gel syntheses. The structure, morphology and inbuilt of samarium was studied using high and atomic resolution transmission electron microscopy and compared with Raman spectroscopy measurements. For photovoltaic use the thin layers of doped TiO 2 were applied at the conducting glass by blade casting. The morphology of the layers was observed by FEG-SEM, while the optical properties were studied by UV-vis spectroscopy. The dye sensitized solar cells were assembled, I-V characteristic and quantum efficiency were measured. Their performances will be discussed in the view of structure and crystallite sizes of the TiO 2 powder with and without doping as well as in the view of the morphology of the obtained electron conducting layers.

nanostructured TiO 2 , doping, structure, optical properties, electrical properties.

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