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O: Fachverband Oberflächenphysik

O 21: Morphology Prediction at Interfaces: Theory meets Experiment

O 21.3: Poster

Monday, March 7, 2016, 18:15–20:30, Poster E

Investigation of the lateral and vertical structure of CuPc on Cu(001) — •Markus Franke, Sonja Schröder, Jonas van Bebber, and Christian Kumpf — Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich GmbH, Jülich, Germany, and Jülich-Aachen Research Alliance (JARA) - Fundamentals of Future Information Technology

For thin molecular films adsorbed on metal surfaces it has been shown that morphology has a big influence on the electronic properties of the system. To achieve a better understanding of the formation of ordered structures, we investigated the system Copper-II-phthalocyanine (CuPc) on Cu(001).

Depending on the substrate temperature and the (sub-monolayer) coverage the CuPc molecules form several different commensurate structures or, at low coverages, remain disordered. We characterized these different phases using STM and LEED, and in one case also with XSW. The most remarkable result may be the breaking of the fourfold symmetry of the LUMO in one of the structures, caused by the degeneracy of both LUMO states being lifted upon adsorption. This is surprising, since both the Cu(001) substrate and the adsorbed molecules originally have the same (fourfold) symmetry.