Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 44: Metal substrates: Adsorption of organic / bio molecules VI
O 44.10: Vortrag
Donnerstag, 26. März 2009, 12:45–13:00, SCH A118
”Soft” metallic contact to isolated C60 molecules — •Hendrik Glowatzki1, Benjamin Bröker1, Ralf-Peter Blum1, Oliver T. Hofmann2, Antje Volmer3, Ralph Rieger4, Klaus Müllen4, Egbert Zojer2, Jürgen P. Rabe1, and Norbert Koch1 — 1Humboldt-Universität zu Berlin, Institut für Physik, Berlin, Germany — 2Technische Universität Graz, Institut für Festkörperphysik, Graz, Austria — 3BESSY, Berlin, Germany — 4MPI for Polymer Research, Mainz, Germany
We investigated the electronic as well as the structural properties of Hexaazatriphenylene-hexanitrile (HATCN) and C60 on Ag(111) by using ultraviolet photoelectron spectroscopy (UPS) and scanning tunneling microscopy (STM) accordingly. HATCN was used as buffer layer to decouple the test-molecule C60 from the metal substrate. Photoemission revealed metallic behavior of HATCN on Ag(111) which calculations confirmed to be due to partial filling the LUMO of chemisorbed HATCN. From STM a regular honeycomb-structure was found. Using C60 as test-molecule on top of this layer the holes within the honeycombs were acting as adsorption centers leading to laterally spacing between C60 molecules as observed by STM. At the same time UPS revealed virtually bulk like electronic properties of C60 on metallic HATCN/Ag(111) which is in strong contrast to the bare C60-Ag(111) interface being significantly altered by charge transfer. This opens up new possibilities in probing the undisturbed properties of individual molecules on metal substrates. This work is financially supported by European Community project "IControl" (EC-STREP-033197).