Berlin 2008 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 18: Poster: Towards Molecular Spintronics, Organic Thin Films, Optical Layers, Vibrational Spectroscopy, Tayloring organic interfaces
DS 18.24: Poster
Dienstag, 26. Februar 2008, 14:30–19:30, Poster A
Mobile Ionic Impurities in Organic Thin Film Dielectrics for Electronic Application — •Reinhard Schwödiauer1, Martin Egginger2, Mihai Irimia-Vladu1, Andreas Tanda4, Irene Frischauf3, Siegfried Bauer1, and Serda Sariciftci2 — 1Soft Matter Physics, Johannes Kepler University, Altenbergerstrasse 69, 4040 Linz, Austria — 2Linz Institute for Organic Soloar Cells, Johannes Kepler University, Altenbergerstrasse 69, 4040 Linz, Austria — 3Institute for Biophysics, Johannes Kepler University, Altenbergerstrasse 69, 4040 Linz, Austria — 4Plastic Electronics GmbH, Rappetsederweg 28,4040 Linz, Austria
In the field of organic electronics organic thin film dielectrics can have a strong influence on the device performance. We present a comprehensive and comparative study of mobile ionic impurities for BCB and poly(vinyl alcohol) with traces of sodium acetate at different concentrations, ranging from below 0.004 mass% up to < 0.5 mass%. The two polymers are investigated both in a metal-insulator-metal (MIM) and a metal-insulator-(C60) semiconductor (MIS) configuration by broadband dielectric spectroscopy in the frequency-(50 *H < f < 10 kHz), dc bias voltage (-25 V < Ubias < +25 V) and temperature (20°C < T < 120°C) domain. In addition we also present measurements on OFETs of the same material combination at different temperatures between 3°C and 60°C.
The consistent results show conclusive evidence for the impact of mobile ions in organic dielectrics for the stability and reliability of organic field effect transistors.