Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 1: Interfaces and Thin Films I
CPP 1.2: Vortrag
Montag, 26. März 2012, 10:00–10:15, C 130
Low temperature route to nano-structured crystalline titania thin films — •Monika Rawolle1, Christian Gebbe1, Erik V. Braden1, Martin A. Niedermeier1, David Magerl1, Kuhu Sarkar1, Volker Körstgens1, Thomas Fröschl2, Nicola Hüsing2, Jan Perlich3, Adeline Buffet3, Stephan V. Roth3, and Peter Müller-Buschbaum1 — 1TU München, Physik Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching, Germany — 2Universität Salzburg, Materialforschung und Physik, 5020 Salzburg, Austria — 3HASYLAB at DESY, 22603 Hamburg, Germany
A low temperature route to crystalline titania thin films is presented, which is interesting for inorganic-organic hybrid photovoltaics due to lower costs, easy producibility and the possibility of using organic flexible substrates. An ethylene glycol modified titanate (EGMT) precursor yields crystalline titania already at low temperatures, where the crystal phase (anatase or rutile) depends on the pH value.[1] We use this precursor to prepare thin films with well-defined nanostructures. The nano-structure is controlled with a diblock copolymer as templating agent combined with sol-gel chemistry. The nano-morphology is investigated with SEM, XRR and GISAXS. Crystallinity is determined with GIWAXS and related to optical properties as probed with UV/Vis spectroscopy. Solar cells prepared with titania derived from EGMT are characterized electronically under illumination with a solar spectrum (AM 1.5).
[1] Denkwitz et al., J. Appl. Catal. B:Environ. (2009) 91, 470.