Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 6: Organic/bio Molecules on Metal Surfaces I
O 6.8: Talk
Monday, March 11, 2013, 12:15–12:30, H38
Coadsorption of Metal-phthalocyanines and PTCDA on Ag(111) — •Christoph Sauer1,2, Marco Grünewald3, Benjamin Stadtmüller4,5, Achim Schöll1,2, and Friedrich Reinert1,2 — 1Physikalisches Institut, Experimentelle Physik VII, Universität Würzburg, D-97074 Würzburg — 2Gemeinschaftslabor für Nanoanalytik, Karlsruher Institut für Technologie (KIT), D-76021 Karlsruhe — 3Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, D-07743 Jena — 4Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, D-52425 Jülich — 5Jülich Aachen Research Alliance (JARA) - Fundamentals of Future Information Technology, D-52425 Jülich
By means of high-resolution photoelectron spectroscopy (PES) we demonstrate that annealing a heteromolecular film of sub-monolayers of metal-phthalocyanine (MePc) deposited on top of one monolayer (ML) of 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) on Ag(111) results in a mixed MePc:PTCDA-monolayer. The replacement of PTCDA by the MePc is explained within a model based on intramolecular Coulomb repulsion. The PES investigation of the mixed MLs exhibits variations of the spectral signatures of the individual components with respect to the pure ML spectra on Ag(111), thus indicating significant differences in the bonding of the respective molecules. Remarkably these spectral variations are more pronounced for mixed CuPc:PTCDA-MLs than for the respective SnPc:PTCDA-ML films.