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SYOO: Organic Optoelectronics and Photonics

SYOO 1: Organic Field-Effect Transistors

SYOO 1.3: Vortrag

Montag, 7. März 2005, 10:15–10:30, TU C130

Deposition of fluorinated phthalocyanines on insulating substrates for OFET applications — •Christine Mattheus¹, Christian Kelting¹, Wilfried Michaelis², Dieter Wöhrle², and Derck Schlettwein¹ — ¹Institute of Applied Physics, Justus-Liebig-University of Giessen, Germany — ²Institute of Organic and Macromolecular Chemistry, University of Bremen, Germany

Phthalocyanines (Pc) are known to yield highly crystalline thin films under appropriate deposition condition. Fluorination of Pc increases the ionization potential, allows facile electrochemical reduction of the films and consequently leads to n-type conduction in thin films. This is of importance for applications in organic field-effect transistors (OFET), where n-type conductors are needed for logic circuits. Aside from this electronic effect, the F-atoms also decrease the intermolecular interactions considerably. This can lead to a large variation in the structure and morphology of thin films, allowing to tailor the film structure by the choice of the central atom group, the type of substrate and the deposition conditions. We have used UV-Vis absorption spectroscopy, atomic force microscopy, and I(V)-characteristics to analyse thin films on dielectric substrates suitable for OFET. We present data on the crystal structure, morphology and charge carrier mobility of fluorinated Pc on organic polymer substrates and reference surfaces.