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O: Fachverband Oberflächenphysik
O 78: Metal substrates: Adsorption of organic / bio molecules IV
O 78.1: Vortrag
Donnerstag, 29. März 2012, 16:00–16:15, A 053
1D growth of α-Sexithiophene on Au(110) — •Rene Hammer1, Tobias Leopold1, and Wolf Widdra1,2 — 1Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany — 2Max-Planck Institut für Mikrostrukturphysik, D-06120 Halle, Germany
The quality of the interface between a metal electrode and the organic semiconducting device is a central issue in organic electronics. Typically the structures of the first layers are quite different from its bulk single crystal structures. However for the growth of α-Sexithiophene (6T) on Au(110) a rather bulk like interface has been proposed [1].
Here we present a scanning tunneling microscopy study of the 6T adsorption on Au(110) at 300K. At low coverages (0.05 monolayer (ML)) the growth of one-dimensional(1D) chains of molecules in [1-10] direction is observed. The structures are 2 molecules wide and several 100nm in length. This chain formation is independent of step edges. At coverages close to a ML a packing of the 1D structures with distances of 4, 5 and 6 Au lattice constants is observed
Single molecular rows grow by a zipper-like mechanism: A topmost atomic row of the (2x1) Au(110) reconstruction shifts by one lattice constant, which leads to a local (1x1) Au(110) micro-facet. These are the preferred adsorption sites of the 6T molecules, in contrast to the previously proposed model [1].
[1] Prato et al., J. Phys. Chem. B 103 (1999)