Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 16: Organic, Polymeric, and Biomolecular Films I
O 16.7: Vortrag
Montag, 26. März 2007, 15:45–16:00, H42
A structural and electronic phase transition at a metal-organic interface: The role of intermolecular interactions — •S. Soubatch1, L. Kilian2, A. Hauschild3, R. Temirov1, A. Schöll2, A. Bendounan2, F. Reinert2, F. S. Tautz1, M. Sokolowski3, and E. Umbach2 — 1International University Bremen (Jacobs University Bremen as of spring 2007), Bremen, Germany — 2Universität Würzburg, Würzburg, Germany — 3Universität Bonn, Bonn, Germany
For the organic semiconductor 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) adsorbed on the Ag(111) surface, it is found experimentally that molecules in the diluted and disordered phase, prepared at low temperatures, and the ordered commensurate monolayer phase are in significantly different adsorption states. This is deduced from comparison of their structural organization (LEED and STM), vertical bonding distances and intermolecular distortions (NIXSW), and the electronic properties (STS and UPS). The experimental data prove that the observed difference in properties of these two states is primarily caused by strong intermolecular interactions.