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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications

SYSA 5: Poster Session SYSA

SYSA 5.2: Poster

Dienstag, 26. Februar 2008, 14:30–20:00, Poster A

Influence of water on the work function of conducting Poly(3,4-ethylenedioxythiophen)/poly(styrenesulfonate) — •Antje Vollmer¹, Andreas Elschner², and Norbert Koch³ — ¹Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung m.b.H.,BESSY, Berlin, Germany — ²H. C. Starck GmbH, Leverkusen, Germany — ³Institut für Physik, Humboldt-Universität zu Berlin, Berlin, Germany

The use of intrinsic conducting polymers ICPs as electrodes and hole injection layers in optoelectronic devices based on conjugated organic materials is a key for the successful implementation of organic electronics. Most ICPs today are based on aqueous dispersions of poly(3,4-ethylene-dioxythiophene) and poly(styrenesulfonate)PEDT:PSS. One of the reasons for this success is the high work function of PEDT:PSS, leading to low hole injection barriers at interfaces between the ICP and the active organic layers. However, reported values for the work function of PEDT:PSS exhibit a significant spread from 4.8 to 5.2 eV. This inconsistency makes it diffcult to predict hole injection barriers in actual devices. Residual water in the film was found to alter the films work function significantly.

N. Koch, A. Vollmer, A. Elschner, Appl. Phys. Lett. 90 (2007) 043512