Regensburg 2004 – scientific programme

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O: Oberflächenphysik

O 33: Organische Dünnschichten II

O 33.7: Talk

Thursday, March 11, 2004, 12:45–13:00, H39

Epitaxy of titanyl phthalocyanine on Au(111) surfaces — •Karsten Walzer, Stefan Mannsfeld, Holger Pröhl, Thomas Dienel, Torsten Fritz, and Karl Leo — Institut für Angewandte Photophysik, TU Dresden, 01062 Dresden

Organic molecular beam epitaxy (OMBE) was applied to grow titanyl phthalocyanine (TiOPc) thin films on a Au(111) single crystalline surface in UHV. The growth was monitored by differential reflection spectroscopy (DRS) in situ, yielding data for submonolayer up to multilayer coverage. Using STM and LEED, we studied the epitaxial growth behaviour. We observed both well-ordered 2d structures and the formation of 3d densely packed crystals. The dimension of the unit mesh in the monolayer regime was obtained from LEED measurements. From the structural data and subsequently performed simulations we conclude that the orientation of the domains in the first monolayer is determined by the substrate lattice. In some cases also the intramolecular structure was resolved by STM. We found that especially in small vacancies of the monolayer often one molecule is confined, which appears rotated (in-plane) with respect to the surrounding phthalocyanine molecules.