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O: Fachverband Oberflächenphysik

O 22: Poster Session: Organic Molecules on Inorganic Substrates I

O 22.3: Poster

Montag, 27. März 2023, 18:00–20:00, P2/EG

Effects of oxygen functionalization on the molecule-substrate coupling — •Jonas Brandhoff, Felix Otto, Maximilian Schaal, Roman Forker, and Torsten Fritz — Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany

5,7,12,14-Pentacenetetrone (P4O) is a polycyclic aromatic hydrocarbon which shows promising electronic properties for batteries. Unlike pentacene the π-system is not delocalized over the entire molecule. P4O shows a strong interaction with metal substrates up to a point where the π-system delocalization reemerges partially over the entire molecule. To understand this phenomenon of metallic organic bonding and charge-transfer, as well as the needed interaction strength for enabling a delocalized π-system over the entire molecule, different substrate-P4O systems were investigated. On the one hand, Cu(111) was chosen as a metallic substrate which shows a strong interaction and charge-transfer. On the other hand, the semi-metallic substrate of epitaxial graphene (EG) on SiC(0001) was selected, showing no charge transfer. As an intermediate system, Pt(111) as a noble metal was investigated. Furthermore hexagonal boron-nitride (h-BN) was used to decouple P4O from the Pt(111) substrate. The change in the structure of the adsorbate film was analyzed using STM and LEED. XPS and UPS measurements gain further insights into the electronic properties. Photoemission orbital tomography (POT) was used to characterize the energetic positions of the frontier orbitals.