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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: Poster Session 1 (joint session with BP)

CPP 19.23: Poster

Tuesday, April 1, 2014, 09:30–13:00, P1

Hierarchically structured titania films for efficient light harvesting in dye-sensitized solar cells — •bo su, yichuan rui, martin a. niedermeier, and peter müller-buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching

Due to high surface to volume ratio and their bicontinuous morphology, foam-like nanostructures are becoming more interesting in photovoltaics. To improve the power conversion efficiency, the light-trapping strategy is widely used in dye-sensitized solar cells (DSSCs) and organic photovoltaics (OPVs). In our study, we demonstrate hierarchically structured titania films, which are made by sol-gel chemistry and soft-molding method, with an additional superstructure in the sub-micrometer range. The master is prepared by photolithography. Then replica molds are made from the master with poly(dimethyl siloxane) (PDMS). Finally, the structured titania films are prepared by PDMS molds. A fairly high level of control over the final morphology is reached via this route. The morphology of these films is characterized with SEM and AFM. The optical properties are determined by UV/Vis spectroscopy and the photocurrent-voltage characteristics of DSSCs are measured.