Dresden 2006 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
CPP: Chemische Physik und Polymerphysik
CPP 27: POSTER Polymer Physics and Materials
CPP 27.34: Poster
Donnerstag, 30. März 2006, 17:00–19:00, P2
Electromechanics of organic Schottky like contacts, in between piezoelectricity and electrostriction — •Reinhard Schwödiauer1, Siegfried Bauer1, Gilles Dennler2, Christoph Lungenschmied2, Niyazi Sariciftci2, and Howard Reiss3 — 1Soft Matter Physics, Johannes Kepler University, Altenbergerstrasse 69, A-4040 Linz, Austria — 2Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, Johannes Kepler University, Altenbergerstrasse 69, A-4040 Linz, Austria — 3Department of Chemistry and Biochemistry, University of California, 600 Charls E. Young Drive East, Los Angeles, CA90095, USA
Piezoelectricity and electrostriction are electromechanical effects at the heart of a variety of applications in transducers. In organic semiconductors an unusual voltage dependences of the electromechanical strain is observed: The converse electromechanical response follows a power law dependence S~V^a of the mechanical strain S versus the applied voltage V, with an exponent a=1.5. The power law exponent is in-between traditional linear piezoelectricity and quadratic electrostriction. The experimental finding is a direct consequence of the strongly nonuniform electric field distribution within the Schottky contact arrangement. Electromechanical responses of organic Schottky devices appear to be of fundamental interest for the investigation of non-uniform electric field distributions, and for potential practical applications as electromechanical transducers.