Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 77: Focussed Session: Towards a Quantitative Understanding of Complex Adsorption Structures: Surface Science goes Organic III

O 77.5: Vortrag

Donnerstag, 3. April 2014, 17:15–17:30, TRE Phy

Growth of 2D molecular crystals: The role of the substrate topology — •Daniel Schwarz1, Caroline Henneke1, Raoul van Gastel2, Harold Zandvliet2, Bene Poelsema2, and Christian Kumpf11Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich and Jülich Aachen Research Alliance (JARA) – Fundamentals of Future Information Technology, 52428 Jülich, Germany — 2Physics of Interfaces and Nanomaterials, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, NL-7500 AE Enschede, The Netherlands

We present a LEEM study on the initial growth dynamics and the influence of the substrate topology on 2D molecular crystals. We have selected BDA and PTCDA, which both are elongated flat organic molecules with oxygen atoms at their ends. Deposited on Cu(001) both molecules form well-ordered 2D crystals. However, despite the similarities, the interaction of the molecules with Cu-steps is quite different, resulting in distinct differences in the domain growth dynamics. Steps are permeable for the smaller BDA molecule, which leads to a growth instability of the Mullins-Sekerka type: Domains grow very fast along the steps and much slower perpendicular to the steps. PTCDA, on the other hand, interacts strongly with steps, which makes them impermeable for molecules and hence does not exhibit the Mullins-Sekerka instability.

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