Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

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

O 47.3: Vortrag

Mittwoch, 24. März 2010, 11:00–11:15, H36

XSW experiments on Copper(II)-Phthalocyanine submonolayer films on noble metal surfaces — •Ingo Kröger1, Christoph Stadler2, Benjamin Stadtmüller1, Christoph Kleimann1, Giuseppe Mercurio1, Patrick Bayersdorfer2, Florian Pollinger2, and Christian Kumpf11Institute of Bio- and Nanosystems 3 (IBN-3), Forschungszentrum Jülich & JARA-FIT — 2Experimentelle Physik II, Universität Würzburg

The adsorption of large pi-conjugated molecules on noble metal surfaces is in the focus of recent experimental and theoretical investigations. The basic bonding mechanisms are of particular interest, as well as their influence on crucial parameters like workfunctions and the alignment of molecular levels with respect to the substrate Fermi level. Geometric parameters are also of high interest. However, the most prominent and fundamental parameter, the adsorption height, is generally overestimated in state of the art DFT calculations. We present a series of X-ray standing wave measurements of the bonding distances for the model system Copper(II)-Phthalocyanine in different submonolayer phases on Ag(111), Au(111) and Cu(111). It is shown that the adsorption height does not only depend on the substrate, but also on the lateral structure of the molecular thin film which is very sensitive to small changes in the coverage [1]. The data are compared with the results of other techniques (see also contributions of C. Kleimann and B. Stadtmüller) and discussed in terms of the interaction strength.

[1] Stadler et al., Nature Physics 5, 153 (2009)

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