Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 54: Organic Molecules on Inorganic Substrates III: Magnetism, Doping and Interfaces
O 54.6: Vortrag
Mittwoch, 3. April 2019, 11:45–12:00, H24
Influences of potassium-intercalation on molecular properties: DBP on Ag(111) — •Felix Otto1, Tino Kirchhuebel1, Anu Baby2, Bernd Schroeter1, Roman Forker1, Guido Fratesi3, and Torsten Fritz1 — 1Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany — 2Department of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy — 3ETSF and Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria, 16, 20133 Milano, Italy
The polycyclic aromatic hydrocarbon tetraphenyldibenzoperiflanthene (DBP, C64H36) has advantageous properties for applications in the field of organic electronics. These are a consequence of its chemical structure consisting of an aromatic backbone with four phenyl rings nearly perpendicular to the molecular plane. We are interested in the effect of potassium intercalation on the structural, optical, and electronic properties of DBP adsorbed on Ag(111). Several structurally reordered stable bonding stages were obtained with K doping. LEED and STM measurements combined with differential reflectance spectroscopy (DRS) as well as XPS and UPS including photoelectron momentum maps (PMMs) were used to investigate the system and yield a variety of different information. These results can only be interpreted unambiguously with the help of DFT calculations. We find that the added K atoms adsorb below the molecule and thereby obstruct the bonding channels between DBP and Ag. A gradual occupation of the DBP LUMO is also observed due to charging by K atoms.