Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 45: Organische Dünnschichten IV

O 45.4: Vortrag

Dienstag, 8. März 2005, 16:30–16:45, TU EB301

Structural and spectroscopic investigations of the laterally structured heterorganic system alkanethiol/PTCDA/Ag(111) — •Florian Pollinger, Stefan Schmitt, Christian Kumpf, and Eberhard Umbach — Exp. Phys. II, Univ. Würzburg, 97074 Würzburg

The planar organic molecule 3,4,9,10-perylenetetracarboxylic acid dianhydride (PTCDA) is well known to form commensurate thin films on Ag(111) surfaces. Furthermore, it has been demonstrated that PTCDA induces faceting on vicinal Ag(111) surfaces by step bunching. For an appropriate choice of coverage, self-organization leads to a grating-like morphology with a periodicity down to several nanometres. This enables the use of these surfaces as pre-patterned templates [1].

Other model systems important for designing organic nanostructures are alkanethiols like 1-Decanethiol and 1-Octadecanethiol. They grow as self-assembled monolayers (SAMs) on clean Au and Ag(111) surfaces. In the study presented here, however, we also deposited them on pre-patterned sub-monolayer PTCDA/Ag(111) substrates. These laterally structured heterorganic systems were investigated using standard surface characterization techniques, like TPD, XPS and LEED.

[1] X.Ma et al., Appl. Phys. Lett. 84 (2004) 4038