Dresden 2009 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 41: Organic Photovoltaics III
CPP 41.7: Talk
Friday, March 27, 2009, 12:00–12:15, ZEU 222
Growth of metal thin films on conductive polymer surfaces — •Gunar Kaune1, Matthias A. Ruderer1, Ezzeldin Metwalli1, Robert Meier1, Weinan Wang1, Sebastien Couet2, Kai Schlage2, Stephan V. Roth2 und Peter Müller-Buschbaum1 — 1TU München, Physik Department LS E13, James-Franck-Straße 1, 85747 Garching — 2HASYLAB at DESY, Notkestraße 85, 22603 Hamburg
Type and structure of the metal electrode deposited on top of the active layer of an organic photovoltaic cell have a strong influence on the performance of the device. Therefore it is necessary to understand the structural growth and the interaction with the photoactive polymer layer. We investigate the formation of a metal/polymer interface by deposition of gold on a poly(N-vinylcarbazole) surface [1]. The growth of the gold film is investigated in-situ with grazing incidence small angle x-ray scattering (GISAXS). In-situ GISAXS allows us to follow the spatial growth of the gold clusters from the initial stage to the formation of a continuous layer and to determine the temporal evolution of the cluster morphology. From these observations a growth model is derived, explaining the cluster growth in four steps, with a characteristic process being attributed to each step. Metal incorporation inside the semi-conducting polymer film is revealed with x-ray reflectivity measurements [1]. Finally, the results are compared with the growth of an aluminium layer on a poly(3-hexylthiophene) surface.
[1] G. Kaune et al., ACS Applied Materials and Interfaces, at press