Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 12: Organic Molecules at Surfaces 2: Characterization of Organic Monolayers

O 12.5: Vortrag

Montag, 5. September 2022, 16:00–16:15, S051

Electronic and structural properties at the NiTPP/O-Cu(100) interface — •Jonah Elias Nitschke¹, Henning Sturmeit¹, Iulia Cojocariu², Vitaliy Feyer², Alessandro Sala², Andreas Windischbacher³, Peter Puschnig³, Stefano Ponzoni¹, Giovanni Zamborlini¹, and Mirko Cinchetti¹ — ¹Department of Physics, TU Dortmund University, Germany — ²Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich, Germany — ³Institute of Physics, University of Graz, Austria

Depending on the strength of the molecule-substrate interaction, charge transfer, chemical reactions or a redistribution of the electronic cloud may occur at organic-metal interfaces. Here, we investigate the structural and electronic properties of Nickel tetraphenylporphyrin molecules (NiTPP) deposited on oxygen-passivated Cu (100) surface. By using a multi-technique approach, which combines LEED and STM, we reveal a coverage dependent superstructure with multiple domains that ultimately reduces into a single unit cell.

In the latter configuration, STM measurements show that the NiTPP molecules adsorb either with the macrocycle planar to the surface on in a saddle-shape configuration, with the pairs of opposite pyrrole rings tilted upwards. STS and photoemission orbital tomo-graphy measurements show that, contrary to the NiTPP adsorbed on the bare Cu(100) surface, where a significant charge transfer is observed, the oxygen overlayer quenches the charge transfer at the interface, thus offering a simple approach to physically decouple of the molecular film from the underlying substrate.