Dresden 2011 – scientific programme
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DS: Fachverband Dünne Schichten
DS 64: Organic Thin Films III
DS 64.4: Talk
Friday, March 18, 2011, 14:45–15:00, GER 38
Correlation between the interface-energetics and thermal stability of SAMs on Gold — •Stefanie Winkler1, Daniel Käfer2, and Christof Wöll3 — 1Helmholtz Zentrum Berlin für Materialien und Energie GmbH Elektronenspeicherring, D-12489 Berlin, Germany — 2Department of Chemical Engineering, Stanford University, CA 94305, USA — 3Institute of Functional Interfaces, Karlsruhe Institute of Technology (KIT), 76012 Karlsruhe, Germany
Improved organic electronic device characteristics can be achieved via SAM-modification, which is attributed to enhanced crystal growth and a lowering of the injection barrier. A variety of thiol-based SAMs was used for an UPS-study to elucidate structure-related properties in such systems. We could generalize the dependency of the workfunction change on the alkanethiol-SAM dipoles to more complex systems based on functionalized aromatic backbones. By adjusting the size of a given SAM or substituting atoms the molecular dipole and subsequently the interface dipole can be tuned.
In addition we employed thermal desorption spectroscopy to correlate the magnitude of the covalent interactions between the SAM's sulfur groups and the gold to the interface energetics. We have indications that, for the investigated systems, varying the SAM functionalization does nof affect the sulfur-gold-bonding, which is in close agreement to the findings of Heimel et al. in 2008, reporting that the thiol- and the headgroup of a particular SAM are electronically decoupled.