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O: Oberflächenphysik
O 14: Poster session I (Adsorption, Epitaxy and growth, Phase transitions, Surface reactions, Organic films, Electronic structure, Methods) (sponsored by Omicron Nanotechnology GmbH)
O 14.54: Poster
Montag, 27. März 2006, 18:00–21:00, P2
Influence of the film morphology on the diffusion of Ag and Au into thin films of the organic semiconductor diindenoperylene — •Michael Scharnberg1, Klaus Rätzke1, Rainer Adelung1, Franz Faupel1, Stephan Meyer2, and Jens Pflaum2 — 1Christian Albrechts Universität kiel — 23. Physikalisches Institut, Universität Stuttgart
The application of organic-based field effect transistors (OFETs) for large scale low-cost electronic devices has lead to intense research. Diindenoperylene (DIP) thin films on SiO2 are a prominent system due to their high structural out-of-plane order. While bottom contact OFET structures can be realized easily, preparation of top contacts might cause diffusion of metal atoms (typically Au) deep into the organic film, thereby changing the injection properties at the interface. Recently, we could establish a very sensitive radiotracer technique to measure even tiny concentrations of atoms [1]. The results show cluster formation on the surface and a low concentration of noble metal atoms dispersed throughout the film indicating that most of the metal atoms are immobilized near the surface due to agglomeration. The results for noble metal atoms in DIP films will be presented here. The structural influence, namely the crystallinity and mosaicity of the organic layer on the metal diffusion will be discussed as it is a fundamental question also for other organic electronic devices like organic solar cells or OLEDs. Furthermore, the results obtained for Ag and Au will be compared. [1] Scharnberg et al., App.Phy.Lett. 86, 024104 (2005)