Dresden 2009 – scientific programme

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DS: Fachverband Dünne Schichten

DS 10: Surface Modification

DS 10.1: Talk

Tuesday, March 24, 2009, 11:00–11:15, GER 37

Interface modification by fluorinated aromatic SAMs — •Christian Schmidt and Gregor Witte — Philipps-Universität Marburg

One of the key issues of organic electronic devices is a precise control of metal-organic heterojunctions. Recently, Gundlach et al. demonstrated that pre-treatment of Au-electrodes with pentafluorobenzenethiol (PFBT) largely improves device characteristics of dif-TESADT based OTFTs [1] which was attributed to enhanced crystal growth and a lowering of injection barrier. However, our previous works revealed only a poor ordering for benzenethiol-SAMs (BT) [2] which becomes even worse for PFBT. Motivated by this apparent contradiction, we investigated the adsorption of the differently fluorinated aromatic thiol based SAMs (benzenethiol, p-fluoro-BT, p-trifluoromethyl-BT and PFBT) on the model substrate Cu(100) which provides well ordered films. By combining various techniques including LEED, UPS, NEXAFS and TDS the microstructure of the films and their influence on the work function have been thoroughly studied and will be discussed.

[1] D. J. Gundlach et al., nature materials, 7, 216 (2008)

[2] D. Käfer, A. Bashir and G. Witte, JPC C, 111, 10546 (2007)