Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 48: Nanoparticles and Composite Materials II
CPP 48.2: Vortrag
Freitag, 18. März 2011, 10:45–11:00, ZEU 114
New approach to low-temperature processed titania for application in inorganic-organic hybrid photovoltaics — •Monika Rawolle1, Matthias A. Ruderer1, Shuai Guo1, Ezzeldin Metwalli1, Erik V. Braden1, Jan Perlich2, Stephan V. Roth2, Thomas Fröschl3, Nicola Hüsing3, and Peter Müller-Buschbaum1 — 1TU München, Physik Department, LS Funkt. Mat., James-Franck-Str. 1, 85748 Garching, Germany — 2HASYLAB at DESY, 22603 Hamburg, Germany — 3Universität Salzburg, Materialforschung und Physik, Salzburg, Austria
Crystalline titania is a widely researched inorganic semiconductor for inorganic-organic hybrid photovoltaics. Among its many advantages are low cost and easy producibility, with the disadvantage of a necessary high-temperature step to obtain the crystalline anatase or rutile polymorph. A possible precursor for titania which does not require a high-temperature step to obtain crystallinity was previously used to create crystalline titania particles with the inverse microemulsion technique for usage in catalysis. [1] We use this precursor to prepare thin films on flexible substrates. The structure is controlled with the diblock copolymer poly(styrene-block-ethylene oxide) [P(S-b-EO)] as templating agent in a so-called good-poor solvent pair induced microphase separation combined with sol-gel chemistry. The structure of the titania films is investigated with XRR and GISAXS. Crystallinity is determined with GIWAXS for different temperatures and related to optical properties as probed with UV/Vis spectroscopy.
[1] R. Rossmanith et al., Chem. Mater. (2008) 20, 5768-5780