Regensburg 2010 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 29: Poster: Molecular Spintronics, Biomolecular and Functional Organic Layers, Organic Electronics and Photovoltaics, Plasmonics and Nanophotonics, Organic Thin Films, Nanoengineered Thin Films, Thin Film Characterisation,

DS 29.12: Poster

Mittwoch, 24. März 2010, 15:00–17:30, Poster A

Template induced-ordering of perfluoropentacene films — •Tobias Breuer and Gregor Witte — Molekulare Festkörperphysik, Philipps-Universität Marburg, 35032 Marburg, Germany

Perfluorination of pentacene offers a promising route to produce an n-type organic semiconductor with promising electronic properties which further has the advantage of being stable against oxidation thus making this material interesting for device applications [1]. On SiO2 substrates perfluoropentacene (PFP) forms needle-like islands with (100) texture which are azimuthally isotropic oriented [2]. In order to characterize the electronic properties of this material in more detail and to determine its band structure the preparation of azimuthally well defined possibly epitaxially ordered films is desirable. Previous attempts have shown that in contrast to pentacene films which grow epitaxially on Bi(0001)/Si such an ordering does not occur for PFP [3]. In this study we compare the structure and morphology of PFP-films grown by OMBD onto SiO2, sapphire and various alkali halide surfaces which have been characterized by AFM, XRD, FTIR and TDS. It is shown that on some alkali halide surfaces uniformly oriented PFP-islands are formed which reflects an epitaxial ordering. The different film structures are discussed in terms of template induced film growth.

[1] Suzuki et al., J. Am. Chem. Soc., 126, 8138 (2004)

[2] Kowarik et al., phys. stat. sol. (RRL) 2, 120 (2008)

[3] Wang et al., Nanotechnology 20, 095704 (2009)