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Proceedings Paper

Smart actuators based on electromechanically active conjugated polymer diodes
Author(s): Gilles Dennler; Reinhard Schwodiauer; Christoph Lungenschmied; Siegfried Bauer; Niyazi Serdar Sariciftci; Howard Reiss
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Paper Abstract

Conjugated polymers are nowadays used in two different types of device. On the one hand, they act as electronically active semiconducting/conducting materials in organic electronic devices. On the other hand, one exploits them as electromechanically active materials since it has been observed that they can experience huge macroscopic strains upon electrochemical doping. We investigated the combination of these two effects by measuring the electromechanical behavior of typical polymeric electronic devices like rectifying (and/or light emitting) diodes. In the case of a poly(para phenylene vinylene) (MDMO-PPV) based diodes, we observed two types of electromechanical actuation. In the forward direction, a significant current (up to several mA/cm2) is flowing. Joule heating induces a thermo-electrostrictive bending of the device substrate. In the reverse direction, the diode behaves like a capacitor. Therefore the strains are induced by Maxwell forces. For poly(3-hexyl-thiophene) (P3HT) based diodes, displacement versus voltage in the reverse direction revealed a power law with an exponent of 1.5. This surprising result can be modeled by Coulombic attraction of the doped impurities present in the depletion zone and the charges present in the metal at the interface.

Paper Details

Date Published: 6 May 2005
PDF: 9 pages
Proc. SPIE 5759, Smart Structures and Materials 2005: Electroactive Polymer Actuators and Devices (EAPAD), (6 May 2005); doi: 10.1117/12.599358
Show Author Affiliations
Gilles Dennler, Johannes Kepler Univ. (Austria)
Reinhard Schwodiauer, Johannes Kepler Univ. (Austria)
Christoph Lungenschmied, Johannes Kepler Univ. (Austria)
Siegfried Bauer, Johannes Kepler Univ. (Austria)
Niyazi Serdar Sariciftci, Johannes Kepler Univ. (Austria)
Howard Reiss, Univ. of California/Los Angeles (United States)

Published in SPIE Proceedings Vol. 5759:
Smart Structures and Materials 2005: Electroactive Polymer Actuators and Devices (EAPAD)
Yoseph Bar-Cohen, Editor(s)

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