Regensburg 2013 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 9: Poster: Interfaces and Thin Films (joint session with DECHEMA and VDI)

CPP 9.1: Poster

Monday, March 11, 2013, 17:30–19:30, Poster C

Fabrication of nanostructured titania thin films for application in hybrid photovoltaics — •Weiguo Lu, Martin A. Niedermeier, Gergory Tainter, and Peter Müller Buschbaum — TU München, Physik-Department, Lehrstuhl für Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching, Germany

Nanostructuring of titanium dioxide thin films has been the subject of numerous studies over the last years due to their important role in various optoelectronic applications, e.g. photovoltaics. These thin films need to meet certain requirements. Exhibiting a high effective surface area and a decent degree of crystallinity is crucial for the functionality and performance. Using block-copolymer templates in combination with a sol-gel synthesis approach to produce metal oxide thin films gives a high control over the morphology and is a promising way to meet those requirements. In this study, nanostructured titania thin films are fabricated with a bi-continuous foam-like structure. The diblock-copolymer poly(styrene-block-ethylene oxide) is used as the templating agent in a sol-gel process to fabricate hybrid thin films, which are subsequently transferred to anatase titania films via a high-temperature calcination step. Due to the hybrid nature of the thin films after the sol-gel preparation route, our films are even suitable for super-structuring. The morphology is investigated with imaging techniques like atomic force microscopy or scanning electron microscopy. The optical properties are probed with UV/Vis spectroscopy and white light interferometry.