Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Poster Session III (Solid/liquid interfaces; Metals; Semiconductors; Oxides and insulators)

O 58.48: Poster

Mittwoch, 28. März 2012, 18:15–21:45, Poster B

Adsorption of Organic Molecules on Potassium Chloride — •Hazem Aldahhak, Eva Rauls, and Wolf Gero Schmidt — Theoretische Physik, Universität Paderborn, Warburger Str. 100, 33100 Paderborn

The ability to grow self-assembled supramolecular nanostructures on solid surfaces has important implications in both basic science and nanotechnology. The constraint to two dimensions enables us to reduce the molecular mobility and study the various interactions between the adsorbed molecules on the one hand and between molecule and surface on the other hand, separately. In recent years, metal surfaces were used as the most common substrate. However, the surfaces of alkali salts like sodium or potassium chloride, open up new possibilities. Surface symmetry and ionicity as well as technological reasons, like e.g. simple mechanisms for the desorption of grown supramolecular assemblies, make these surfaces a worthwile alternative to metal substrates.

We present our investigations of the adsorption of organic molecules like PTCDA on KCl and NaCl surfaces. To this aim, we have performed first principles density functional theory calculations and focussed on both the geometric and electronic structure of single molecules as well as molecular layers at higher coverages.