Dresden 2009 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 25: Organic Thin Films V
DS 25.3: Vortrag
Mittwoch, 25. März 2009, 18:30–18:45, GER 37
Smoothening and efficient void filling in Perfluoropentacene-templated growth of Pentacene — •Alexander Hinderhofer, Stefan Kowarik, Alexander Gerlach, and Frank Schreiber — Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen
Pentacene (PEN) and perfluoropentacene (PFP) have been found to be promising candidates for organic electronic and opto-electronic applications due to their high mobilities1.
We use in situ real-time x-ray reflectivity to monitor crystallinity and roughness evolution during growth of a heterojunction of PEN and PFP. PEN evaporated on PFP leads to efficient gap filling of the rough PFP surface so that the heterojunction is coherently ordered throughout the complete bilayer. The growth of such a coherent crystalline system is facilitated by similar geometry and similar crystalline lattice spacing of the molecules. In addition the growth of PEN on PFP has a smoothening effect, i.e. the top roughness of the PEN film is lower than the roughness of the underlying PFP film and far lower compared with PEN growth on a SiO2 substrate.
The data analysis of a coherently ordered PFP-PEN bilayer is presented and possible explanations for the anomalous growth behavior are discussed.
[1] A. Hinderhofer, U. Heinemeyer, A. Gerlach, et al., J. Chem. Phys. 127, 194705 (2007).