Regensburg 2007 – scientific programme
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O: Fachverband Oberflächenphysik
O 44: Poster Session II (Semiconductors; Oxides and Insulators: Adsorption, Clean Surfaces, Epitaxy and Growth; Surface Chemical Reactions and Heterogeneous Catalysis; Surface or Interface Magnetism; Solid-Liquid Interfaces; Organic, Polymeric, Biomolecular Films; Particles and Clusters; Methods: Atomic and Electronic Structure; Time-resolved Spectroscopies)
O 44.16: Poster
Wednesday, March 28, 2007, 17:00–19:30, Poster C
Molecules can climb : Islands formation during organic molecular beam epitaxy — Dingyong Zhong1,2, •Ruifen Dou2, Wenchong Wang2, Harald Fuchs1,2, and Lifeng Chi2 — 1Institut für Nanotechnologie, Forschungszentrum Karlsruhe, 76021 Karlsruhe, Germany — 2Physikalisches Institut and Center for Nanotechnology, Universität Münster, Wilhelm-Klemm-str. 10, 48149 Münster, Germany
The epitaxial growth of organic thin film has been studied. Islands with sharp edge, flat top and nearly uniform height are formed on metal crystalline substrate at certain range of growth temperatures. To understand the mechanism of the islands formation, a model is proposed in which the binding energy of molecules at the step edge is various at different terraces due to the lattice mismatching of the first monolayer and the three-dimensional island beyond the first monolayer. Both the ascending and descending interlayer transport processes are considered. The numerical simulations of the rate equations based on this model are consistent well with the experimental results.