Dresden 2011 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 42: Poster I: Progress in Micro- and Nanopatterning: Techniques and Applications (jointly with O); Spins in Organic Materials; Ion Interactions with Nano Scale Materials; Organic Electronics and Photovoltaics; Plasmonics and Nanophotonics (jointly with HL and O); High-k and Low-k Dielectrics (jointly with DF); Organic Thin Films; Nanoengineered Thin Films; Layer Deposition Processes; Layer Properties: Electrical, Optical, and Mechanical Properties; Thin Film Characterisation: Structure Analysis and Composition; Application of Thin Films
DS 42.53: Poster
Mittwoch, 16. März 2011, 15:00–17:30, P1
Density-Dependent Reorientation and Rehybridization of the Strongly Chemisorbed Conjugated Molecule Hexaazatriphenylene-hexacarbonitrile (HATCN) on Ag(111) — •A. Vollmer1, B. Bröker2, O. T. Hofmann3, G. M. Rangger3, P. Frank3, R.-P. Blum2, R. Rieger4, L. Venema5, H. Glowatzki2, K. Müllen4, J. P. Rabe2, A. Winkler3, P. Rudolf5, E. Zojer3, and N. Koch2,1 — 1Helmholtz Zentrum Berlin für Materialien und Energie GmbH, Germany — 2Institut für Physik, Humboldt-Universität zu Berlin, Germany — 3Institute of Solid State Physics, Graz University of Technology, Austria — 4MPI für Polymerforschung, Mainz, Germany — 5Zernike Institute for Advanced Materials, Groningen, The Netherlands
Understanding the fundamental electronic and morphological properties of interfaces between metals and conjugated organic materials (COM) is crucial in the field of organic electronics. Hitherto, it has been commonly accepted that the orientation of a COM monolayer on a metal surface depends only on the strength of metal-molecule vs. intermolecular interactions. Here we show that a re-orientation of a face-on to an edge-on first layer can be triggered by increasing the amount of deposited molecules. We will report on the strong molecular acceptor HATCN on Ag(111), where this rearrangement is facilitated through the molecular cyano groups and accompanied by a rehybridization of molecular and metal electronic states, significantly modifying the interface and surface electronic properties. We will present UPS, ΔΦ, TDS, RAIRS, STM, and DFT. PRL,104,23,(2010), Nano Lett,8,11,(2008)