Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 62: [DS] Organic Electronics and Photovoltaics I (jointly with CPP, HL, and O)
O 62.3: Vortrag
Donnerstag, 17. März 2011, 10:45–11:00, GER 38
Growth and morphology of aluminium contacts on P3HT films — •Gunar Kaune1,2, Robert Meier1, Ezzeldin Metwalli1, Volker Körstgens1, Kai Schlage3, Sebastien Couet3, Stephan V. Roth3, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department, Lehrstuhl für Funktionelle Materialien, James-Franck-Straße 1, 85747 Garching — 2Martin-Luther-Universität Halle-Wittenberg, Institut für Physik, Fachgruppe Photovoltaik, Von-Danckelmann-Platz 3, 06120 Halle — 3HASYLAB at DESY, Notkestraße 85, 22603 Hamburg
The characteristics of organic electronic devices are strongly influenced by the type and structure of the metal electrodes needed to inject or extract charge carriers. Therefore understanding of the metal growth process and its relation to the interactions at the metal-organic interface are necessary. We investigate the growth of an aluminium layer on the surface of a P3HT thin film by in-situ application of grazing incidence small-angle X-ray scattering (GISAXS). By subsequent modelling of the scattering data the structural parameters of the growing film are extracted and a growth process is found, which proceeds two-dimensional by stacking single atomic layers on top each other. This process results in a homogeneous film with a large contact area to the polymer and is explained by a strong chemical interaction between aluminium and P3HT, which suppresses clustering of the metal on the polymer surface. The diffusion of single aluminium atoms into the P3HT and the formation of an intermixing layer is revealed by X-ray reflectivity measurements.