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O: Fachverband Oberflächenphysik

O 81: Poster Focus Session: Molecular Nanostructures on Surfaces - New Concepts towards Complex Architectures

O 81.11: Poster

Mittwoch, 14. März 2018, 18:15–20:30, Poster A

Fluorescence microscopic analysis on the orientation of PTCDA domains on KCl(100) in ultrahigh vacuum — •Nils Rohbohm¹, Christian Marquardt¹, Rudolf Merkel², and Moritz Sokolowski¹ — ¹Institut für Physikalische und Theoretische Chemie der Universität Bonn, Wegelerstraße 12, 53115 Bonn, Germany — ²Institute of Complex Systems, ICS-7: Biomechanics, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany

We report data obtained by an epi-fluorescence light microscope directly attached to a surface science UHV-chamber. We have studied the fluorescent and superradiant domains formed in the monolayer of PTCDA on a thin epitaxial film of KCl on a Ag(100) surface. The domains exhibit a brick-wall-type structure and nucleate in two perpendicular orientations. Using additional rotatable polarisation filters in the incident and detected beam paths, we can spatially discriminate the two types of differently oriented domains. At present the spatial size of one domain can be as large as 1000 µ m². From the microscopic images we deduce information on the domain growth in relation to the local surface morphology. Brightfield images of the underlying Ag(100) surface show a macroscopic corrugation which appear to be correlated with the pattern of the PTCDA domains detected by fluorescence. Supported by the DFG.