Dresden 2017 – scientific programme

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O: Fachverband Oberflächenphysik

O 5: Organic-Inorganic Hybrid Systems and Organic Films I

O 5.9: Talk

Monday, March 20, 2017, 12:30–12:45, WIL A317

Electronic Properties of the Potential Organic Superconductor 1,2;8,9-Dibenzopentacene on Ag(111) — •Felix Otto, Maximilian Schaal, Christian Udhardt, Tobias Huempfner, Lennart Vorbrink, Bernd Schröter, Roman Forker, and Torsten Fritz — Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany

Research on superconductivity in doped polycyclic aromatic hydrocarbons has attracted strong interest in the last few years. Among the investigated molecules potassium-doped 1,2;8,9-dibenzopentacene (DBPen, C₃₀H₁₈) was reported to exhibit one of the highest critical temperatures (33 K) [1]. Nevertheless, there are only few studies regarding its electronic properties. We deposited thin films of DBPen on Ag(111) in the range up to a few monolayers and investigated their behavior after several annealing procedures. Thickness dependent measurements with ultraviolet and x-ray photoelectron spectroscopy (UPS, XPS) were combined with low-energy electron diffraction (LEED) to elucidate the relationship between structural and electronic properties. We observed molecular signatures in the UP spectra which have their origin in different electronic structures of the molecules. These are analyzed under consideration of the LEED patterns that show one rather stable highly ordered phase. The influence of the molecule-substrate interaction on the results will also be discussed.