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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 10: Poster: Charge transfer effects in molecular materials (related to symposium SYCT)

CPP 10.1: Poster

Montag, 11. März 2013, 17:30–19:30, Poster C

Foam-like structures of titania films for application in flexible photovoltaic — •Bo Su, Martin A. Niedermeier, Monika Rawolle, and Peter Müller-Buschbaum — TU München, Physik Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching, Germany

Due to high surface to volume ratio and their bicontinuous morphology, foam-like nanostructures are becoming more interesting in photovoltaics, for example in hybrid solar cells and dye-sensitized solar cells (DSSC). The nanoporous titania layers are responsible for the electron transporting and directing dye layers' structure. In our studies, the morphology of titania films is investigated with respect to a possible incorporation into hybrid solar cells. The titania films are prepared by a sol-gel process in combination with block copolymer templating. Via this route we have a very high level of control over the final morphology. The films are typically prepared via spin-coating, followed by a calcination step to remove the polymer template and obtain crystalline titania. Additionally, our method is even suitable for low-temperature synthesis by changing the titania precursor. The structure of these films is probed with the imaging techniques such as scanning electron microscopy and atomic force microscopy. To determine the optical and opto-electronical properties UV/Vis spectroscopy and photoluminescence are used.