Dresden 2006 – scientific programme
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O: Oberflächenphysik
O 35: Organic films III
O 35.4: Talk
Thursday, March 30, 2006, 12:00–12:15, WIL B321
Influence of the substrate morphology on the organic layer growth of PTCDA/Ag(111) — •Thomas Schmidt1, Helder Marchetto2, Ullrich Groh1, Helmut Kuhlenbeck2, Rainer Fink3, Hans-Joachim Freund2, and Eberhard Umbach1 — 1Experimentelle Physik II, Universität Würzburg — 2Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin — 3Physikalische Chemie II, Universität Erlangen-Nürnberg
Using UV-excited photoelectron emission microscopy (UV-PEEM) we investigated the microscopic growth behavior of organic thin films (here PTCDA) on a Ag(111) single crystal substrate. Real time observation allows to correlate the growth mode (and related kinetic parameters) with substrate properties like terrace width (step density) and step bunches for the initial film formation, i.e., from the submonolayer range up to 5 monolayers. Above room temperature PTCDA (3,4,9,10-perylene-tetracarboxylic acid dianhydride) grows in a Stranski-Krastanov like fashion: after completion of the first two stable layers three dimensional islands are formed. The nucleation density depends drastically on the substrate morphology and thus affects the structural and morphologic properties of the organic film. Funded by BMBF under contract no. 05KS4WWB/4.