Berlin 2008 – wissenschaftliches Programm

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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications

SYSA 5: Poster Session SYSA

SYSA 5.82: Poster

Dienstag, 26. Februar 2008, 14:30–20:00, Poster A

Molecular Wires and Assemblies on Ionic Surfaces — •Lars Zimmerli, Thilo Glatzel, Bartosz Such, Pascal Steiner, and Ernst Meyer — Department of Physics, Klingelbergstr. 82, 4056 Basel, Switzerland

The adsorption of functional organic molecules on insulating surfaces offers fascinating perspectives for novel nanometer sized electronic and optoelectronic devices. However, the growth of ordered molecules is often hampered by the strength of the intermolecular interaction compared to molecule-surface interaction [1].

In this contribution we report on the self assembly of cyano-porphyrin based molecules deposited on in-situ cleaved and annealed ionic (KBr and NaCl) surfaces. The molecular arrangements on the terraces and steps are analyzed in detail using an ultrahigh vacuum nc-AFM operated at room temperature. Ordered molecular assemblies grown out of a bunch of disordered molecules at step edges are typically found. Single molecular wire-like structures were resolved within the assemblies. The arrangement as well as the orientation of the ordered molecules with respect to the atomic lattice of the substrate has been determined from measurements showing atomic and molecular resolution simultaneously. Along straight monatomic steps single molecular wires of several hundred nanometers length were found.

[1] L Zimmerli et al., J. Phys.: Conf. Ser. 61 (2007) 1357.