Berlin 2008 – wissenschaftliches Programm
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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications
SYSA 5: Poster Session SYSA
SYSA 5.58: Poster
Dienstag, 26. Februar 2008, 14:30–20:00, Poster A
Structure of the top contact in photovoltaic devices: Au deposition on TiO2:PVK hybrid thin films — •Gunar Kaune1, Mottakin M. Abul Kashem1, Alexander Diethert1, Weinan Wang1, Sebastien Couet2, Kai Schlage2, Ralf Röhlsberger2, Stephan V. Roth2, Andreas Timmann2, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department LS E13, James-Franck-Straße 1, 85747 Garching — 2HASYLAB at DESY, Notkestraße 85, 22603 Hamburg
Photovoltaic energy conversion systems based on an inorganic semiconductor and a semi-conductive polymer, so called hybrid solar cells, promise to open new solar cell applications. In a common device, a thin metal film is deposited on top of the hybrid film in order to apply electrical contact. Since type and structure of this metal electrode influence the performance of the solar cell, the understanding of its structural growth and the interaction with the polymer layer is necessary.
In our study, we use a model system consisting of nanostructured titanium dioxide and poly-N-vinylcarbazole (PVK) blended with zinc phthalocyanine (ZnPc). On top of this, a thin gold film was deposited by rf-sputtering. In-situ to deposition, the growth of the gold film was probed with grazing incidence small angle scattering (GISAXS) with a very high time resolution of 1 second. Particular attention was paid to the initial stage of the growth, where the first gold particles form on the polymer surface. The results obtained from fitting the 2d scattering data are compared with information about the surface morphology obtained with atomic force microscopy.