Dresden 2009 – scientific programme
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O: Fachverband Oberflächenphysik
O 52: Metal substrates: Adsorption of organic / bio molecules VII
O 52.11: Talk
Thursday, March 26, 2009, 17:30–17:45, SCH A118
Adsorption of metal-phthalocyanines on the Ag(111) surface — •Ingo Kröger1, Christoph Stadler1, Patrick Bayersdorfer1, Florian Pollinger1, Abdreas Stahl1, Felix Erfurth1, Benjamin Stadtmüller1, Christian Kumpf1,2, and Friedrich Reinert1,3 — 1Universität Würzburg, Experimentelle Physik II, 97074 Würzburg — 2Forschungszentrum Jülich GmbH, IBN-3, D-52425 Jülich — 3Forschungszentrum Karlsruhe GmbH, Gemeinschaftslabor für Nanoanalytik, D-76021 Karlsruhe
The sub-monolayer growth of metal-phthalocyanines (MePc) on the Ag(111) surface exhibits a rich phase diagram consisting of 2D gas-like phases, commensurate phases and - most interestingly - continuous series of phases with point-on-line coincidence with the substrate. The latter are caused by a repulsive molecule-molecule interaction which can be tuned (and even suppressed) by changing coverage and/or temperature. Therefore these adsorbate systems represent model systems for investigating the interplay of molecule-molecule and molecule-substrate interaction as well as geometric and electronic structure.In this talk we present an overview of the phase diagrams for CuPc, SnPc, TiOPc and H2Pc. The data was obtained using spot profile analysis low energy electron diffraction (SPA-LEED) and X-ray standing waves (XSW). Comparing these systems gives insight in the molecular adsorption geometry as well as the influence of the central metal atom on the molecule-substrate and the molecule-molecule interactions.