Regensburg 2004 – wissenschaftliches Programm

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O: Oberflächenphysik

O 14: Postersitzung (Adsorption an Oberflächen, Epitaxie und Wachstum, Organische Dünnschichten, Oxide und Isolatoren, Phasenübergänge, Rastersondentechniken, Struktur und Dynamik reiner Oberflächen)

O 14.25: Poster

Montag, 8. März 2004, 18:00–21:00, Bereich C

Investigation of perylene derivatives with STM — •Markus Wahl1, Meike Stöhr1, Michael De Wild1, Hans-Joachim Güntherodt1, Christian Galka2, Lutz Gade2, and Thomas Andreas Jung1,31Institute of Physics, University of Basel, Klingelbergstr. 82, 4056 Basel, Switzerland — 2Laboratoire de Chimie Organometallique et de Catalyse, Institut Le Bel, Universite Louis Pasteur, 4, rue Blaise Pascal, 67070 Strasbourg, France — 3Laboratory for Micro- and Nanostructures, Paul Scherrer Institut, 5232 Villigen, Switzerland

In the last years perylene derivatives have attracted much attention because of possible and already existing applications in electronic and optoelectronic devices. The derivative (4,9-diaminoperylenequinone-3,10-diimine = DAPQDI) we investigated belongs to a class of compounds which is cited very often in the patent literature for photovoltaic devices. From differential thermoanalysis and gravimetry it is known that the DAPQDI can polymerize. With UHV-STM experiments we tried to figure out if this polymerization can also take place on surfaces. Therefore, thin films in the monolayer regime were prepared by OMBE (Organic Molecular Beam Epitaxy) on Ag(111) and Cu(111) substrates. Additionally, the samples could be annealed. In a first step, the arrangement of DAPQDI on the surface was examined. Ordered arrangements of stripes running parallel to the step edges of the substrate were found. In a next step, the influence of annealing temperatures on the molecular arrangement will be examined in order to be able to initiate the polymerization.

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