Dresden 2017 – scientific programme

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DS: Fachverband Dünne Schichten

DS 44: Postersession II

DS 44.16: Poster

Thursday, March 23, 2017, 17:00–19:00, P1C

Morphology and adsorption of organic thin films on MgO/Ag(100) — •Sabrina Pechmann, Daniel Schultheiß, and Rainer H. Fink — Physical Chemistry II, FAU Erlangen-Nuremberg, Erlangen, Germany

Over recent years a vast field of new technological applications for organic thin films on defined and tunable metal-oxide surfaces has gained increasing attention. These systems allow investigation by various electron or photon based techniques, which would be impossible for bulk metal-oxides due to potential charging. Epitaxial MgO/Ag(100) was chosen as model system, as both bulk structures exhibit a comparatively small lattice mismatch [1], which reduces the amount of defects. Growth could be observed in-situ by LEEM, stoichiometry and thin film properties were checked by XPS and LEED-IV. It could be shown, that MgO can be modified by electrons and photons, enabling to tune the surface properties. The MgO surface serves as substrate for semiconducting organic molecules with large, extended pi-systems. For our studies cobalt (II) octaethylporphyrin, its free base equivalent, PTCDA and dihexylquatertiophene were chosen, as all those systems grow in different, highly ordered manners. Therefore their long-range ordered superstructure could be determined by LEED, whereas NEXAFS dichroism offered insight into the molecular orientation. Furthermore, it was possible to metalize octaethylporphyrin by the underlying magnesium [2]. This work is funded by the funCOS research unit (FOR 1878, DFG). [1] Valeri, S. et al., Surf. Sci. 507-510, 311-317, 2002 [2] Schneider, J. et al., Chem. Eur. J. 22, 1744-1749, 2016