Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 55: Inorganic/Organic Interfaces: Electronic Properties II
O 55.8: Vortrag
Mittwoch, 18. März 2015, 17:00–17:15, HE 101
The geometric and electronic structure of TCNQ and TCNQ+Mn on Ag(001) surface — Vitaliy Feyer1, Martin Graus2,3, •Giovanni Zamborlini1, Robert G. Acres4, Achim Schöll2,3, Friedrich Reinert2,3, and Claus M. Schneider1,5 — 1Research Center Jülich, 52425 Jülich, Germany — 2Universität Würzburg, Experimentelle Physik VII & Röntgen Research
Center for Complex Material Systems RCCM, 97074 Würzburg, Germany — 3Karlsruher Institut für Technologie KIT, Gemeinschaftslabor für Nanoanalytik, 76021 Karlsruhe, Germany — 4Sincrotrone Trieste, 34012 Basovizza, Trieste, Italy — 5Universität Duisburg-Essen, D-47048 Duisburg, Germany
We have investigated the geometric and electronic structure of ordered monolayers of TCNQ and of TCNQ+Mn on Ag(001) surface by LEED and photoelectron momentum microscopy (at the NanoESCA beamline of the Elettra synchrotron). Two coverage dependent, commensurable superstructures are established on Ag(001) while the co-adsorption of Mn results in the formation of a long-range ordered mixed metal-organic superstructure, which is also commensurate. From ARPES pattern of the TCNQ LUMO the azimuthal orientation of the molecules in the respective unit cell can be determinate. The PES data shows, in the case of TCNQ/Ag(100) a filling of the TCNQ LUMO by charge transfer from the substrate while the coadsorption of Mn leads to an energy shift of the TCNQ HOMO and LUMO of 230 meV with respect to TCNQ/Ag(001). No significant lateral band dispersion in the adsorbate layers was observed in ARPES data.