Dresden 2011 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 64: Organic Thin Films III

DS 64.4: Vortrag

Freitag, 18. März 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.