Berlin 2015 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Organic Thin Films
CPP 12.2: Talk
Monday, March 16, 2015, 15:30–15:45, H 2032
Epitaxial Growth of a Methoxy-Functionalized Quaterphenylene — •Frank Balzer1, Roland Resel2, Arne Lützen3, Horst-Günter Rubahn1, and Manuela Schiek4 — 1MCI, NanoSyd, University of Southern Denmark, Alsion 2, DK-6400 Sønderborg, Denmark — 2Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria — 3University of Bonn, Kekulé Institute for Organic Chemistry and Biochemistry, Gerhard-Domagk-Str. 1, D-53121 Bonn, Germany — 4University of Oldenburg, Energy and Semiconductor Research Laboratory, Institute of Physics, Carl-von-Ossietzky-Str. 9-11, D-26111 Oldenburg, Germany
Thin films from conjugated small molecule semiconductors are important building blocks for organic electronics. Functionalization can control their electrical and optical properties, but also change thin film morphology. Here the epitaxial growth of a methoxy functionalized para-quaterphenylene (MOP4) on alkali halides as well as on mica is investigated by a combination of low energy electron diffraction (LEED), polarized (confocal) light microscopy (PLM), atomic force microscopy (AFM), and X-ray diffraction (XRD). On both substrates a thin film phase is present, resulting however in different morphologies: On the alkali halides mainly islands from upright molecules form, whereas on mica clusters and nanofibers from lying molecules grow. LEED even detects an initial wetting layer on mica with a different structure. Especially the fibers show a specific polarization pattern of the emitted blue fluorescence. Clusters and fibers age via Ostwald ripening due to water vapor, resulting in a strong change of morphology.