Berlin 2008 – scientific programme
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O: Fachverband Oberflächenphysik
O 33: Symposium: Frontiers of Surface Sensitive Electron Microscopy I (Invited Speakers: James Hannon, Raoul van Gastel, Thomas Schmidt)
O 33.5: Talk
Tuesday, February 26, 2008, 15:15–15:30, MA 005
Photoemission electron microscopy investigation of organic thin films — •Maria Benedetta Casu1, Indro Biswas1, Mathias Nagel1, Peter Nagel2, Stefan Schuppler2, and Thomas Chassé1 — 1Institute of Physical and Theoretical Chemistry, University of Tuebingen, 72076 Tübingen, Germany — 2Forschungszentrum Karlsruhe, Institut für Festkörperphysik, 76021 Karlsruhe, Germany
Organic electronic devices offer an interesting alternative to inorganic semiconductor electronics due to low-cost deposition methods, flexible substrates, and simple packaging. The organic molecules can be vapour deposited under vacuum, spin coated, dip coated or printed on the proper substrate. All these techniques are relevant for low cost electronics and their potentiality is still enormous. To favour further technical developments, the full understanding of electronic, structural, and morphological properties of organic materials plays a paramount role. Diindenoperylene (DIP) is a perylene-based molecule that shows a very high hole mobility already in thin films, good film forming properties and thermal stability, thus it may be considered as a promising molecule for electronics. In this work we present the results of photoemission electron microscopy (PEEM) investigations on DIP thin films deposited on polycrystalline gold. We focused on the different phases that may occur while growing a film on a given substrate. Based on the synergy of PEEM, X-ray photoemission, and nano near-edge X-ray absorption fine structure spectroscopy results, we propose a model for the growth of DIP thin film deposited with a relative low deposition rate (0.3 nm/min) on polycrystalline gold kept at room temperature.