Dresden 2011 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 42: Poster I: Progress in Micro- and Nanopatterning: Techniques and Applications (jointly with O); Spins in Organic Materials; Ion Interactions with Nano Scale Materials; Organic Electronics and Photovoltaics; Plasmonics and Nanophotonics (jointly with HL and O); High-k and Low-k Dielectrics (jointly with DF); Organic Thin Films; Nanoengineered Thin Films; Layer Deposition Processes; Layer Properties: Electrical, Optical, and Mechanical Properties; Thin Film Characterisation: Structure Analysis and Composition; Application of Thin Films

DS 42.30: Poster

Mittwoch, 16. März 2011, 15:00–17:30, P1

Characterisation of Organic Field-Effect Transistors using Zinc Tetraphenylporphyrin Monomers and Dimers as Active Layers — •Iulia Genoveva Korodi¹, Daniel Lehmann¹, Simona Pop², Aoife Ryan³, Mathias Senge³, and Dietrich R. T. Zahn¹ — ¹Chemnitz University of Technology, Semiconductor Physics, D-09107 Chemnitz, Germany — ²ISAS-Institute for Analytical Sciences, Albert-Einstein-Str.9, D-12489 Berlin, Germany — ³School of Chemistry, SFI Tetrapyrrole Laboratory, Trinity College Dublin, Dublin 2, Irland

In this work bottom contact organic field-effect transistors (OFETs) using Zinc Tetraphenylporphyrin (ZnTPP) monomers and dimers as active layers were prepared and characterised. The ZnTPP dimer molecules are intramolecularly connected via a C≡C bridge. The films were prepared by drop coating from a tetrahydrofuran solution on Si substrates with 100 nm SiO₂ on top with pre-structured gold contacts (from Fraunhofer IPMS Dresden). The channel lengths and the channel width defined by the lithography mask are L = 2.5 µ m, 5 µ m, 10 µ m and 20 µ m and W = 10 mm, respectively. The influence of using ZnTPP monomers or dimers on the on/off ratio, threshold voltage and charge carrier mobility is compared and discussed. The effect of the morphology as revealed by the scanning electron microscopy images is discussed as well.