Regensburg 2013 – scientific programme

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DS: Fachverband Dünne Schichten

DS 31: Organic thin films II

DS 31.5: Talk

Thursday, March 14, 2013, 15:45–16:00, H8

Growth of p-6P thin films on graphene studied by AFM — •Markus Kratzer¹, Stefan Klima¹, Borislav Vasić², Radoš Gajić², Aleksandar Matković², and Uroš Ralević² — ¹Institute of Physics, Montanuniversitaet Leoben, Austria — ²Institute of Physics, University of Belgrade, Serbia

Graphene is a potential candidate as transparent and flexible electrode material in organic electronics. In this study we investigated the growth morphology of the rodlike para-hexaphenyl (6P) molecule on graphene as a model system. Exfoliated graphene transferred onto a silicon oxide support was used as substrate. Sub-monolayer amounts of 6P were deposited by means of hot wall epitaxy at substrate temperatures between 280 K and 420 K. The evolving film morphologies were investigated via atomic-force microscopy. While on the SiO2 support just 6P islands consisting of upright standing molecules were found, the 6P film on the graphene evolves needle like structures which are known to be composed of flat lying molecules [1] and which also have been observed for 6P deposited onto epitaxial graphene on Ir(111) at 350 K [2]. The needle formation on graphene is favored at elevated temperatures, resulting in 6P films solely consisting of needles for deposition temperatures over 360 K.

[1] C. Teichert, G. Hlawacek, A. Andreev, H. Sitter, P. Frank, A. Winkler, N.S. Saricifci, Appl. Phys. A 82 (2006) 665. [2] F.S.Khokhar, G. Hlawacek, R. v. Gastel, H. J. W. Zandvliet, C. Teichert, B. Poelsema, Surf. Sci. 606 (2012) 475.