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O: Fachverband Oberflächenphysik
O 73: Organic Molecules on Inorganic Substrates V: Adsorption, Growth and Networks
O 73.12: Vortrag
Mittwoch, 18. März 2020, 18:00–18:15, TRE Phy
Multi-method study of trans-DBPen on coinage metal (111)-surfaces — •Felix Otto, Maximilian Schaal, Tobias Huempfner, Falko Sojka, Marco Gruenewald, Roman Forker, and Torsten Fritz — Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany
Several polycyclic aromatic hydrocarbons (PAHs) become superconducting after the intercalation of alkali metal atoms. The number of promising candidates has increased in the last few years. Among them, K3.451,2:8,9-dibenzopentacene (trans-DBPen, C30H18) is the one with the highest critical temperature reported so far. Nevertheless, the microscopic mechanisms of superconductivity in K-doped PAHs are still under debate. One open question is, for example, the effect of structural order in bulk materials as well as two-dimensional layers.
Our work deals with the growth of trans-DBPen on Ag(111), Au(111), and Cu(111) in the monolayer (ML) regime. The self-assembled thin films were prepared using organic molecular beam epitaxy. The structure was characterized by means of low energy electron diffraction (LEED). In the sub-ML range, we observe a 2D gas-like behavior, whereas the first MLs on the different substrates are characterized by highly ordered structures. Photoelectron spectroscopy (PES) including photoelectron momentum maps (PMMs) was used to study the interaction of the molecules with the substrate as well as the influence of the second ML on the electronic structure. The investigated systems exhibit notable differences according to the different interaction strengths with the substrate.