IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Organic Films and Devices Thursday Sessions
       Session OF+TF-ThM

Paper OF+TF-ThM6
Structure of Ultrathin Pentacene Films

Thursday, November 1, 2001, 10:00 am, Room 131

Session: Characterization of Organic Thin Films
Presenter: S. Lukas, Ruhr-Universität Bochum, Germany
Authors: S. Lukas, Ruhr-Universität Bochum, Germany
G. Witte, Ruhr-Universität Bochum, Germany
C. Wöll, Ruhr-Universität Bochum, Germany
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The structure of ultrathin films (1-3ML) of pentacene grown by evaporation under UHV conditions on various copper surfaces has been studied by LEED, STM and NEXAFS. The enhanced binding energy of acene molecules at step edges which was measured systematically by TDS can be utilized to prepare ordered monolayer films on vicinal copper surfaces with close packed terraces while only disordered films grow on the flat Cu(111) surface.@footnote 1@ Highly ordered mono- and multilayer films were also obtained for the Cu(110) surface and their corresponding molecular orientation was determined by NEXAFS as a function of the film thickness. For comparison additional films were grown also on gold and sapphire surfaces. In addition to the geometrical structure the electronical properties of these pentacene films were investigated by UPS. @FootnoteText@ @footnote 1@ S. Lukas et al., J. Chem. Phys. 114 (2001) .