Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.92: Poster
Mittwoch, 24. März 2010, 17:45–20:30, Poster B1
Morphology, geometric and electronic structure of ultra thin films of perylene bisimide dyes on Ag(111) — •Markus Scholz1, Rüdiger Schmidt2, Achim Schöll1,3, Frank Würthner2, and Friedrich Reinert1,3 — 1Universität Würzburg, Experimentelle Physik VII, 97074 Würzburg — 2Universität Würzburg, Institut für Organische Chemie, 97074 Würzburg — 3Gemeinschaftslabor für Nanoanalytik, Forschungszentrum Karlsruhe, 76021 Karlsruhe
Perylene tetracarboxylic acid bisimides dyes (PBI) are among the best n-conducting organic materials. The molecular structure and electronic properties of these molecules can be tailored by halogen substituents attached to the perylene core which induces a twist angle in the planar perylene backbone. We studied the morphology, geometric and electronic structure of ultra thin epitaxial films of the planar PBI−H4, the slightly twisted PBI−F2 and the strongly twisted PBI−Cl4 on Ag(111) substrates. At coverages below one molecular layer a long range order was observed at room temperature. From the characteristic LEED patterns we deduced real space models for each sample. Incommensurate superstructures were found were the size of the unit cell increases from PBI−H4 to PBI−Cl4. Moreover, the bonding at the interface and consequently the electronic structure is significantly influenced by the molecular conformation thus providing a possible route for tailor the properties of metal-organic interfaces.