Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 42: Poster: Organic-Inorganic Hybrid Systems and Organic Films

O 42.2: Poster

Dienstag, 13. März 2018, 18:15–20:30, Poster A

Benzene on Ag(111) and Cu(111): A quantitative TPD study — •Janika Hochstraßer, Lukas Hellweg, Stefan Renato Kachel, Martin Schmid, and J. Michael Gottfried — Fachbereich Chemie, Philipps-Universität Marburg, Germany

The quantitative understanding of metal-organic interfaces is an important prerequisite for the further rational improvement of organic electronic devices, in which these interfaces occur at the electrode/semiconductor contacts. One of the most important single parameter for the quantitative characterization of the metal-organic interaction is the adsorption energy, which can be determined by precision temperature-programmed desorption (TPD) experiments via the desorption activation energy. Such energies represent valuable benchmark data for comparison with computational studies. Here, we focus on benzene as an aromatic model compound and study its interaction with Ag(111) and Cu(111) surfaces. Using an advanced TPD setup with a cryoshroud housing around the mass spectrometer enables us to detect exclusively molecules with a direct line-of-sight path between sample and ion source. The highly precise desorption energies obtained with this setup will be compared with previous experimental and theoretical results.