Berlin 2008 – wissenschaftliches Programm
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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications
SYSA 5: Poster Session SYSA
SYSA 5.64: Poster
Dienstag, 26. Februar 2008, 14:30–20:00, Poster A
Real-Time Observation of PTCDA Growth on Ag(111) - a SMART Investigation — •Florian C. Maier1, Pierre L. Levesque2, Thomas Schmidt1, Helder Marchetto2, Ulrich Groh1, Tomas Skala2, Rainer Fink3, Hans-Joachim Freund2, and Eberhard Umbach1,4 — 1Universität Würzburg, Experimentelle Physik II, 97074 Würzburg — 2Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14159 Berlin — 3Univ. Erlangen-Nürnberg, Phys. Chemie II, 91058 Germany — 4Forschungszentrum Karlsruhe, 76021 Karlsruhe
The spectro-microscope SMART, an aberration corrected high resolution LEEM/PEEM (Low Energy/Photo-Emission Electron Microscope) system, has been used to investigate the growth of thin organic films on metal substrates and their interaction. The growth of PTCDA (3,4,9,10 perylene-tetracarboxylic-acid dianhydrid) on a single-crystalline Ag(111) surface has been observed in-situ and in real-time at substrate temperatures between 220 and 390~K. LEEM, PEEM and LEED studies reveal the dependence of the growth mode, the structure and the phase formation on both, the temperature and the substrate morphology. Whereas PTCDA grows in a mound like quasi layer-by-layer fashion at low temperatures, Stranski-Krastanov growth (i.e. a bi-layer followed by 3D islands) occurs above room temperature. Details of the real-time investigation like the dynamic behaviour of the growing layers, the metastability and desorption of single layers will be discussed. (Funded by BMBF, contract 05KS4WWB/4)