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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 8: Poster Session SYOE
SYOE 8.26: Poster
Dienstag, 27. März 2007, 18:00–20:00, Poster B
Para-sexiphenyl thin films grown on KCl(001) substrates — Andrei Andreev1, Gerardo Sosa2, Thomas Haber3, Andrey Kadashchuk4, •Gregor Hlawacek1, Roland Resel3, Helmut Sitter2, Serdar Sariciftci5, and Christian Teichert1 — 1Inst. of Physics, University of Leoben, Austria — 2Inst. of Semiconductor and Solid State Physics, University Linz, Austria — 3Inst. of Solid State Physics, Graz University of Technology, Austria — 4Inst. of Physics, Natl. Acad. of Sci. of Ukraine, Kiev, Ukraine — 5Inst. f. Organic Solar Cells (LIOS), University Linz, Austria
Para-sexiphenyl (6P) films grown on KCl(001) substrates are promising for optoelectronic devices. In this work we use Atomic Force Microscopy (AFM), x-Ray diffraction (XRD) and photoluminescence (PL) in order to find the parameters controlling film morphology, structure and quality. It is shown that the initial growth stage is characterized by the formation of long needles, generating a rectangular network in accordance with the substrate surface symmetry. With increasing coverage, terraced mounds composed of upright standing molecules developing between the needles. Both features are single crystalline as shown by XRD and TEM. PL studies have shown that the emission spectra contain two different components - a structured spectrum due to intrinsic excitons and a broad red-shifted band ascribed to some kind of defects. It was shown that the relative intensity of the defect band is much weaker in the films grown on KCl comparing to that on mica. This finding confirms the high quality of the films and supports an idea of structural origin of these defects.