Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 15: Postersitzung (Adsorption an Oberfl
ächen, Epitaxie und Wachstum, Organische Dünnschichten, Oxide und Isolatoren, Rastersondentechniken, Zeitaufgelöste Spektroskopie, Methoden)

O 15.33: Poster

Freitag, 4. März 2005, 17:00–20:00, Poster TU D

Ultra-thin hexaphenylene films grown on Au(111) and Au(433) — •Stefan Müllegger, Axel Stupnik, Manfred Leisch, and Adolf Winkler — Institute of Solid State Physics, Graz University of Technology, Austria.

The physical properties of ultra-thin films of organic semiconducting materials are to a great extent determined by their structure and morphology. This is important for both fundamental and applied research (e.g. organic thin film transistors, organic light emitting devices). We present experimental investigations on ultra-thin films of para-hexaphenylene (6P) grown by an organic molecular beam epitaxy (OMBE) technique on single crystalline Au(111) and vicinal Au(433) surfaces under ultra-high vacuum conditions. Founded on a variety of surface analytical techniques, e.g. low energy electron diffraction (LEED), thermal desorption spectroscopy (TDS), x-ray photoelectron spectroscopy (XPS) and scanning tunnelling microscopy (STM), several aspects are discussed, concerning the development of a highly regular structure of the first and second 6P monomolecular layer as well as the kinetics of adsorption and growth of several nm thick 6P films. Although 6P is considered chemically rather stable, experimental evidence for a strong dissociative behaviour of 6P adsorbed on the Au(111) surface at elevated temperatures is presented.