a Institute of Physics, University of Leoben, Franz Josef Strasse 18, 8700 Leoben, Austria b Department of Solid State Physics, Graz Technical University, 8010 Graz, Austria c CHESS, Cornell University, Ithaca, NY 14853, USA
Abstract:
The growth of para-sexiphenyl thin films by organic molecular beam epitaxy (OMBE) on mica(0 0 1) was investigated. The morphology of the films was qualitatively and quantitatively analyzed by atomic-force microscopy. Synchrotron radiation was used in order to extract information about orientation of the individual molecules with respect to the substrate. Controlling the growth environment inside the growth chamber allowed to reproduce one-dimensional film morphologies with partially oriented crystallite chains usually obtained by hot wall epitaxy (HWE). Following a dedicated pregrowth procedure results in terraces of upright standing molecules so far not obtained. Phase imaging was used to clearly distinguish film and substrate.