Dresden 2009 – scientific programme

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O: Fachverband Oberflächenphysik

O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)

O 27.3: Poster

Tuesday, March 24, 2009, 18:30–21:00, P2

Characterization of Epitaxial Layers of Organic Molecules by Three-Dimensional Force- and Dissipation-Spectroscopy — •Gernot Langewisch, Daniel Braun, Harald Fuchs, and Andre Schirmeisen — CeNTech (Center for Nanotechnology) and Institute of Physics, University of Münster, Germany

Thin films of π-conjugated organic molecules are of high relevance for organic semiconductor applications. A widely studied organic semiconductor is 3,4,9,10-perylenetetracarboxylic-dianhydride (PTCDA). We applied non-contact atomic force microscopy in ultrahigh vacuum to investigate PTCDA deposited on Ag(111) by molecular beam epitaxy. Single PTCDA-molecules, arranged in the herringbone structure, were resolved in the topography scans. By site-specific force and dissipation versus distance measurements three-dimensional maps of tip-sample forces and dissipation with submolecular resolution were obtained. These maps are interpreted with respect to mechanical relaxation processes of the individual molecules.