Dresden 2006 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 18: Polymer Materials II
CPP 18.3: Talk
Wednesday, March 29, 2006, 16:15–16:30, ZEU 114
Flexible ferroelectret field-effect switches — •Ingrid Graz1, Martin Kaltenbrunner1, Christoph Keplinger1, Reinhard Schwödiauer1, Siegfried Bauer1, Stephanie Lacour2, and Sigurd Wagner2 — 1Soft Matter Physics, Johannes Kepler University, Altenberger Str. 69, A-4040 Linz, Austria — 2Department of Electrical Engineering, Princeton University, Princeton NJ, 08544, USA
Ferroelectrets are internally charged cellular polymers with engineered macroscopic dipoles formed on the internal surfaces of the voids. The strong piezoelectricity of ferroelectrets results in large external electric fields when the mechanical stress acting on the ferroelectret changes. The generated electric field can be used to alter the conductance of the source-drain channel of thin film field-effect transistors (ferroelectret-field effect transistor). We have prepared flexible ferroelectret field-effect switches made of cellular polypropylene films and amorphous silicon thin film transistors. Single element piezoelectric switches, pressure sensors and microphones are demonstrated, which may easily be scaled up to large area, flexible transducer arrays.