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O: Fachverband Oberflächenphysik

O 36: Gaede Prize Talks

O 36.4: Spezialvortrag

Dienstag, 8. März 2016, 15:00–15:30, H11

Large-scale reconstruction of metal-organic interfaces induced by chemisorption and surface stress change — •Eberhard Umbach^1,2, Florian Pollinger^1,3, Stefan Schmitt^1,4, Thomas Schmidt², Helder Marchetto², and Achim Schöll¹ — ¹Exp. Physik VII, Universität Würzburg, Am Hubland, 97074 Würzburg — ²Fritz-Haber-Institut der MPG, Abt. CP, 14195 Berlin — ³Physikalisch-Technische Bundesanstalt, D-38116 Braunschweig — ⁴SPECS GmbH, D-13355 Berlin

The adsorption of large organic molecules on metal substrates can have enormous influence on the topography, geometric structure, and electronic properties of this interface provided that the interaction is chemisorptive. Thus, under certain preparation conditions large scale reconstructions may occur which originate from a significant change of surface stress and may involve large mass transport. These reconstructions can lead to regular nano-patterns which are useable as templates in a bottom-up approach in nanotechnology. More important could be that such reconstructions may have considerable influence on the electric and optical properties of metal-organic devices, and can even lead to failure, if, e.g., the interface between metallic electrode and adjacent organic layer changes under operating conditions.

The talk will address this topic using the archetype system PTCDA on various Ag surfaces some of which are highly-indexed (vicinal). Results from various surface methods including STM, spectro-microscopy and a cantilever bending method will be presented to analyze and interpret the results.