Dresden 2009 – scientific programme
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O: Fachverband Oberflächenphysik
O 52: Metal substrates: Adsorption of organic / bio molecules VII
O 52.8: Talk
Thursday, March 26, 2009, 16:45–17:00, SCH A118
Investigation of the electronic structure of CuPc on Cu(100) interfaces using ARUPS with polarized light — •Michael Wießner1, Marc Haeming1, Frank Forster1, Achim Schöll1, and Friedrich Reinert1,2 — 1Universität Würzburg, Experimentelle Physik II, D-97074 Würzburg — 2Forschungszentrum Karlsruhe, Gemeinschaftslabor für Nanoanalytik, D-76021 Karlsruhe
The understanding of the electronic structure at metal-organic interfaces is crucial for electronic devices since it determines the charge transport through metal-organic contacts. Particularly if chemical interaction occurs, as it is the case between most aromatic organic molecules and metals, the hybridization of molecule and metal wave functions effects both the energy position and the symmetry of the involved orbitals. Consequently, the dipole matrix element, i.e. the intensity of a photoemission signal, will be influenced. This phenomenon can thus be utilized as a sensitive probe for the interfacial interaction and the character of the involved molecular and metal states.
We report on an investigation of the adsorption of ultra-thin Cu-phthalocyanine films on Cu(100) surfaces by means of angular resolved photoemission spectroscopy (ARPES) with polarized light. By using a monochromatized HeIα source with a high degree of polarization and with variable polarization direction we observe polarization-dependent intensities for signals from the substrate, from the adsorbate molecules, and from interface states which are generated due to the chemisorption. The evaluation of these variations in intensity shows that the applied method is a usefull tool for understanding the interaction mechanisms.