Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.63: Poster

Tuesday, April 1, 2014, 18:30–22:00, P2

Growth of coronene-layers on reactive and inert substrates — •Tobias Huempfner, Falko Sojka, Marco Gruenewald, Roman Forker, and Torsten Fritz — Friedrich-Schiller-University Jena, Institute of Solid State Physics, Max-Wien-Platz 1, 07743 Jena, Germany

Here we report on the growth of ultrathin coronene-layers on different substrates deposited via Organic Molecular Beam Epitaxy (OMBE) under ultra-high vacuum conditions. On the one hand we used reactive substrates like Ag(111) and Au(111), on the other hand inert substrates like mica. The differences in the optical properties due to the molecule-substrate interactions were observed in situ during the deposition using Differential Reflectance Spectroscopy (DRS) [1]. The resulting molecular structures of the coronene-films are characterized with Low Energy Electron Diffraction (LEED) as well as Scanning Tunneling Microscopy (STM) for metallic and Atomic Force Microscopy (AFM) for inert substrates, respectively, at about 1 K.

A layer system consisting of potassium-chloride (KCl) on a Ag(100) surface gains special interest as a substrate for this molecule, because KCl-layers seem to be easy to prepare on this surface [2]. Moreover, STM investigations are still possible due to the metal-crystal below the KCl-layer, although the coronene still grows electronically decoupled from the Ag(100) surface.

[1] R. Forker et al., Annu. Rep. Prog. Chem., Sect. C: Phys. Chem., 2012, 108, 34-68.

[2] M. Müller et al., Surface Science, 2011, 605, 1090-1094.