Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 25: Organic films II
O 25.6: Vortrag
Dienstag, 28. März 2006, 17:00–17:15, PHY C213
Optimizing the charge carrier injection from Au electrodes in organic electronic devices — •Stephan Rentenberger1, Antje Vollmer2, Egbert Zojer1, and Norbert Koch3 — 1Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria — 2Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstahlung mbH, Albert-Einstein-Str. 15, D-12489 Berlin, Germany — 3Humboldt-Universität zu Berlin, Institut f. Physik, Newtonstrasse 15, D-12489 Berlin, Germany
The performance of organic-based devices (e.g. light emitting diodes, transistors) is governed by two key factors: charge carrier transport within the active organic material and injection of charge carriers from the electrodes into the organic layer. We demonstrate that the work function of Au electrodes can be increased by exposure to UV/ozone. Consequently, the hole injection barriers (HIBs) between such Au electrodes and organic materials were lowered by as much as 1.4 eV compared to untreated Au electrodes. HIBs were measured using photoelectron spectroscopy. The lowering of HIBs was observed for a wide variety of organic materials [N,N’-diphenyl-N,N’-bis(1-naphthyl)-1,1’-biphenyl-4,4’-diamine, sexiphenyl, sexithiophene, poly-(3-hexylthiophene), and poly-fluorene], which indicates the universal applicability of our Au electrode modification method.