engleski

Structural, optical and electrical properties of multilayer structures for solar cells formed on TiO2 nano-tubes

TiO2 is material considered as a prominent electrode material in solar cells. Nano forms of TiO2 such as nanoparticles, nanorods, nanowires and, in particular nanotubes may allow obtaining high efficiency photosensitive devices and solar cells. In order to be widely used, the method of producing large areas should be established. The formation of nanotubes perpendicular to the surface, on thin TCO film and decoration with dye molecules or perovskites looks as good first steps. In order to control the properties averaged on relatively large area, the suitable method should be established as well and grazing incidence x-ray scattering GISAXS, looks promising in that sense. The TiO2 nano porous thin films were prepared by electro chemical etching of thin Ti films prepared by magnetron sputtering. The as deposited films were etched using various concentrations of acid and under various voltage and current densities. The properties were estimated upon small and wide angle x-ray scattering under grazing incidence angles and scanning electron microscopy and correlated with condition of formation. The nanostructures estimated upon X-ray scattering were correlated with results obtained by high resolution electron microscopy and advantages and disadvantages of these methods were discussed. In second step, the nanotubes were decorated with active organic materials and finalized in typical solar cells. For each step, the structural, optical and electrical properties of obtained multilayer structures were measured and compared with properties of identical ones formed on other nanostructures formed with chemical methods and on near flat surfaces. Acknowledgments Research was supported by project: “Titanium dioxide nanostructures for photovoltaic solar cell: professional development of young researchers/postdoctorands” financed by the European Union from the European Social Fund and in part by the Croatian Science Foundation under the projects IP-2014-09-9419 and IP-11-2013-2753.

thin films ; nanotubes ; titania

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