Regensburg 2010 – scientific programme

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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 29.26: Poster

Wednesday, March 24, 2010, 15:00–17:30, Poster A

Influence of substrate charge on organic field effect transistors — •Lorenz Kehrer, Christian Melzer, and Heinz von Seggern — Electronic Materials Department, Institute of Materials Science, Technische Universität Darmstadt, Petersenstraße 23, 64287 Darmstadt, Germany

The development of printed electronics on flexible substrates is a great challenge for current research. During a continuous roll-to-roll process the often used plastic substrate can be unintentionally charged by contact electrification or by a controlled corona discharge to improve the adhesion of the organic inks. It is thus worth investigating the time and temperature stability of the trapped substrate charge and the impact of the remaining charge on the device operation. We have investigated the charging process of PET by applying different corona charging conditions and by detecting the resulting surface potential with a Kelvin probe as a function of time and temperature following the charging procedure. By measuring thermal stimulated currents the trap distribution as well as the thermal and temporal stability of the substrate charge was analyzed. The effects of existing substrate charge on a top gate organic field effect transistor is discussed and further simulated by dual gate transistors with well defined electrode potentials.