Dresden 2011 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 31: Postersitzung II

MM 31.9: Poster

Mittwoch, 16. März 2011, 17:15–18:45, P5

Niobium doped SrTiO3 and p-type CoFe2O4 nanocomposite films for photoelectric applications — •Bruno Jasper, Daniel Mierwaldt, Andreas Blumenstein, Sven Schnittger, Jörg Hoffmann, and Christian Jooß — Institute of Material Physics, University of Göttingen, Germany

Patterned arrays of pn-junctions are interesting model systems for the study of photocatalytic and photovoltaic applications. In this field, self-organizing systems show promising results with respect to simple preparation and increasing efficiency. As an example of self-organized oxide structures we present a study of nanocomposites composed of strontium titanate (SrTiO3) and cobalt ferrite (CoFe2O4) prepared by reactive ion beam sputtering. Doped SrTiO3 is a photoactive material allowing water splitting. Properly doped CoFe2O4 is a good conductor which serves well as a catalyst in hydrogen production. Voltage-cyclometric measurements reveal photo-catalytic activity of single phase Nb:SrTiO3 as well as the SrTiO3-CoFe2O4 nanocomposite films. Furthermore, first results on the fabrication of n-type niobium doped strontium titanate (Nb:SrTiO3) and off stoichiometric p-doped cobalt ferrite (p:CoFe2O4) by self-organized decomposition are presented. The structural and chemical properties of the samples are examined by scanning electron microscopy, X-ray diffraction, transmission electron microscopy and energy dispersive X-ray spectroscopy.