Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 38: Organic Molecules on Inorganic Substrates II: Electronic Properties and Charge Transfer

O 38.3: Vortrag

Dienstag, 2. April 2019, 14:30–14:45, H24

Strong and weak interactions of metal organic networks with metal surface: adsorption geometry and electronic structure. — •Iulia Cojocariu¹, Matteo Jugovac¹, Giovanni Zamborlini², Vitaliy Feyer¹, and Claus M. Schneider^2,3 — ¹PGI-6, Forschungszentrum Jülich GmbH, Germany — ²TU Dortmund, Exp. Phys. VI, Germany — ³Fakultät für Physik and CENIDE, Universität Duisburg-Essen, Germany

We report a study of the adsorption behaviour of iron phthalocyanine (FePC) in the first and second layer atop of low-index crystal faces of silver. The combination of low-energy electron diffraction and molecular orbital tomography (MOT) allows the determination of the superstructure unit cell and the azimuthal orientation of the molecules with respect to the substrate. Additionally, momentum patterns give information about the electronic structure and the symmetry of molecular orbitals in the first and second organic layer.

Within the MOT approach, it is possible to disentangle the contribution of the first and the second FePC long-range ordered layers to the whole valence band spectrum. While the first exhibit strong hybridization and charge transfer with the metal surface (as pointed by partially filled LUMOs in the momentum maps), the second is decoupled. This analysis allows us to understand the peculiarities of the phenomena at the organic/metal interface.

Experiments were carried out at the NanoESCA beamline at Elettra. The setup includes a PEEM that directly images parallel momentum component (k_x,k_y) of emitted photoelectrons at a fixed binding energy.