Berlin 2005 – wissenschaftliches Programm
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DS: Dünne Schichten
DS 4: Halbleitende, amorphe und organische Schichten
DS 4.4: Vortrag
Freitag, 4. März 2005, 15:30–15:45, TU HS107
Organic thin films on different inorganic substrates — •Helmut Sitter1, Andrei Andreev1, Harald Hoppe2, Thomas Haber3, Detlef Smilgies4, Niyazi Serdar Sariciftci2, and Roland Resel3 — 1Institute for Semiconductor and Solid State Physics, University Linz, A-4040 Linz, Austria — 2Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, University Linz, A-4040 Linz, Austria — 3Institute of Solid State Physics, Graz University of Technology, Austria — 4CHESS G-line, Cornell University, Ithaca NY 14853, USA
Recently we reported that a self-organization of para-sexiphenyl (PSP) molecules occurs during Hot Wall Epitaxy (HWE) on mica, resulting in very long crystalline, parallel oriented nano-fibers emitting blue light with dichroic ratios up to 14. In this work we use Atomic Force Microscopy and X-ray diffraction to study comparably HWE grown PSP layers on different crystalline substrates like mica and KCl. Substrate temperature, substrate type and symmetry are decisive parameters for the growth mode. In particular, while PSP grows on mica in needle-like fashion with only one preferential direction, the growth on KCl(001) is characterized by co-existence of the needles and 3D-islands. The former are the initial growth stage of the films, generating a rectangular network in accordance with substrate surface symmetry. We investigated also the growth of PSP on other crystalline substrates: MoSe2, GeS, GaN and TiO2.