Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 22: Organic-Inorganic Hybrid Systems and Organic Films III

O 22.2: Vortrag

Montag, 20. März 2017, 17:15–17:30, WIL A317

Electronic structure of magnesiumtetraphenylporphyrin on MgO — •Rebecca Pöschel, Gianluca di Filippo, and Thomas Fauster — Lehrstuhl für Festkörperphysik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 7, 91058 Erlangen

Ultrathin films of magnesium oxide (MgO) covered with magnesium tetraphenylporphyrin (MgTPP) were grown in-situ on a Ag(100) single crystal. The layer thickness of MgTPP was varied as well as the layer thickness of MgO underneath. The influence of the substrate and of the MgTPP layer thickness on the occupied and unoccupied molecular orbitals were investigated using photoelectron spectroscopy. With vacuum ultra-violet photoelectron spectroscopy (photon energy 21.2 eV) the occupied orbitals were studied and for the unoccupied orbitals two-photon photoelectron spectroscopy was used (photon energies of 3.06 eV - 3.16 eV and 4.59 eV - 4.76 eV). We found a HOMO-LUMO gap of around 4 eV similar to previous measurements on Ag(100).