INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Doped-ZnO mechanical milled nano-sized powders for dye sensitized cells
J.OROZCO-MESSANA; L. C. DAMONTE; V.DONDERIS; S. FERRARI; M.A.HERNÁNDEZ-FENOLLOSA
Simposio; European Materials Research Symposium; 2009
ZnO nanoparticles with different doping agents are of great interest as elemental components in new cheap hybrid organic/inorganic photovoltaic cells consisting of a wide band gap semiconductor and conjugated polymer as sensitize. Zinc oxide nanoparticles which optical and electrical properties have been modified by the Al and In presence acting as small quantities of dopant were prepared by mechanically milling. The nano sized powder of zinc oxide compounds were obtained from metal oxides (In2O3, Al2O3) or pure metal (In, Al) mixtures. Parameters such as initial concentrations, atmosphere and milling times were varied. Structural and optical characterization of ZnO-doped powders by X-ray diffraction, positron annihilation spectroscopy, scanning electron microscopy and optical reflection spectroscopy were done. Different phases were obtained according to the initial conditions (precursor used, atmosphere, etc.). For the resulting phases the evolution with annealing treatments of size powder, positron annihilation parameters and optical properties were analyzed. The knowledge obtained can be of use to give direction to the improvement of the performance of hybrid organic/inorganic solar cells.