Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 47: Metal substrates: Adsorption of organic / bio molecules V

O 47.10: Vortrag

Mittwoch, 24. März 2010, 12:45–13:00, H36

Electronic structure of ultra thin organic hetero-interfaces - SnPc/PTCDA/Ag(111) — •Achim Schöll1, Marc Häming1, Michael Greif1, Michael Wiessner1, and Friedrich Reinert1,21Universität Würzburg, Experimentelle Physik VII, D-97074 Würzburg, Germany — 2Karlsruhe Institute of Technology, Gemeinschaftslabor für Nanoanalytik, D-76021 Karlsruhe, Germany

While the interfaces of molecules to a substrate have been studied extensively, knowledge about the interface between different molecular compounds is still relatively scarce. This is to some extend caused by the fact that these interfaces, which are of great relevance for opto-electronic devices consisting out of multiple organic compounds, are more complicated to access experimentally. Structurally well defined model systems, which allow for a systematic and detailed investigation of the interface characteristics, are thus of great importance. In this work we provide data from x-ray absorption and photoelectron spectroscopy on the organic heterolayer system tin-phthalocyanine (SnPc) / perylen-tetracarboxylicacid dianhydride (PTCDA). We show, that SnPc, prepared on a Ag(111) surface precovered by a monolayer of PTCDA, forms a well defined interface with a closed first layer of flat lying molecules. Moreover, the bonding of the SnPc molecules to the PTCDA interlayer is clearly non-covalent and a detailed inspection of the valence spectra shows that the respective molecular signatures can be distinguished well. The SnPc/PTCDA/Ag(111) system is thus well-suited for further investigations employing complicated techniques.

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