Dresden 2006 – scientific programme
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O: Oberflächenphysik
O 14: Poster session I (Adsorption, Epitaxy and growth, Phase transitions, Surface reactions, Organic films, Electronic structure, Methods) (sponsored by Omicron Nanotechnology GmbH)
O 14.41: Poster
Monday, March 27, 2006, 18:00–21:00, P2
Influence of surface defects on the lateral order at metal-organic interfaces — •Pavo Vrdoljak1, Lennart Kilian1, Dominique Hübner1, Achim Schöll1, Rainer Fink2, and Eberhard Umbach1 — 1Universität Würzburg, Experimentelle Physik II — 2Universität Erlangen, Physikalsche Chemie II
The adsorption of organic molecules on well-ordered metal surfaces is governed by a complicated interplay between the structural, chemical, and electronic properties of adsorbate and substrate. Thus for many large organic molecule-on-metal systems various structural modifications may occur depending on, e.g., the substrate surface, temperature, or coverage. However, steps and surface defects may have a large influence on the lateral order and on phase transitions between different structural modifications. This is an issue that has not yet been investigated in depth for large organic adsorbates. Our present model system is a monolayer of 1,4,5,8-naphthalene-tetracarboxylicacid dianhydride (NTCDA) on Ag(111) which shows various superstructures with different degrees of long-range order depending on coverage and substrate temperature. We analyse the influence of substrate and surface defects on the order of different structural modifications of the adsorbate layer and on the transitions that occur between these phases.