Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 26: Organic-inorganic hybrid systems and organic films III
O 26.4: Vortrag
Dienstag, 13. März 2018, 11:15–11:30, MA 042
Adsorption energies of aromatic molecules from quantitative TPD — Stefan R. Kachel1, Benedikt P. Klein1, Janika Hochstraßer1, Martin Schmid1, Steffen Seiler2, Bernd Meyer2, and •J. Michael Gottfried1 — 1Fachbereich Chemie, Philipps-Universität Marburg, Germany — 2Interdisciplinary Center for Molecular Materials and Computer-Chemistry-Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
Arguably the most important single parameter for the quantitative characterization of metal-organic interfaces 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 and are important prerequisites for the further rational improvement of organic electronic devices, in which metal-organic interfaces occur at the contacts between electrode and semiconductor. Since many typical organic semiconductors are based on aromatic hydrocarbon backbones, we focus here on benzene and other aromatic model compounds and study their interactions with the (111) surfaces of Cu, Ag and Au. An advanced TPD setup with a cryoshroud housing around the mass spectrometer enables us to suppress desorbing molecules without a direct line-of-sight path between the surface and the ion source. The precise desorption energies obtained by detailed analysis will be compared with previous experimental and theoretical results.