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 37.62: Poster

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

Structural and optical investigations of organic-organic heterosystems — •Julia Peuker, Falko Sojka, Matthias Meissner, Marco Gruenewald, Roman Forker, and Torsten Fritz — University of Jena, Institute of Solid State Physics, Max-Wien-Platz 1, 07743 Jena, Germany

Here, we report on the epitaxial growth of quaterrylene (QT) on one monolayer of hexabenzocoronene (HBC) on graphene, epitaxially grown on silicon carbide (SiC(0001)). During the deposition the change of the optical properties is observed with Differential Reflectance Spectroscopy (DRS). This in-situ method provides information on the interaction of the molecular transition dipoles and a possible charges transfer. It is also used for the control of the layer thickness to get a well-defined structure. The resulting structure is characterized by Low Energy Electron Diffraction (LEED). Finally, other heterostructures serve as comparison.

It is already known that an organic interlayer can change the interaction between the substrate, here epitaxial graphene, and the subsequently deposited molecules drastically. This effect can be used for electronic decoupling. [R. Forker, D. Kasemann, T. Dienel, C.Wagner, R.Franke, K. Müllen, and T. Fritz, Adv. Mater. 2008, 20, 4450 - 4454.]