Regensburg 2007 – wissenschaftliches Programm

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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices

SYOE 8: Poster Session SYOE

SYOE 8.36: Poster

Dienstag, 27. März 2007, 18:00–20:00, Poster B

Highly ordered phthalocyanine films on polycrystalline gold foil - on the — •Biswas Indro¹, Schuster Britt-Elfriede¹, Peisert Heiko¹, Nagel Mathias¹, Casu Maria Benedetta¹, Schuppler Stefan², Nagel Peter², Pellegrin Eric^2,3, and Chassé Thomas¹ — ¹Institut für Physikalische und Theoretische Chemie, Universität Tübingen, Auf der Morgenstelle 8, 72076 Tübingen, Germany — ²Forschungszentrum Karlsruhe, Institut für Festkörperphysik, P. O. Box 3640, 76021 Karlsruhe, Germany — ³Consorcio para la Construcción, Equipamiento y Explotación del Laboratorio de Luz de Sincrotrón, P. O. Box 68, 08193 Bellaterra (Barcelona), Spain

The orientation of phthalocyanines in thin-films has been reported earlier to be determined by the possibility of "locking in" the growth mode to an orientation parallel to the substrate, and in the case of relatively rough substrates, no "lying" orientation has been observed at film thicknesses of more than a few nanometres. [1] The detailed preparation conditions however may significantly affect the substrate morphology. In particular, the parameters of the argon ion sputtering procedure may be varied, which can lead to various results. The orientation of evaporated copper phthalocyanine thin-films on differently prepared gold foils was examined by NEXAFS and Raman spectroscopy. Argon ion sputtering at higher energies leads to weakly ordered films with perpendicular orientation, while lower energies lead to highly ordered films of parallel molecules. Thus, the morphology of the substrate has to be viewed in detail for each preparation procedure.

[1] Peisert et al., Surf. Sci. 600 (2006) 4024.