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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications
SYSA 5: Poster Session SYSA
SYSA 5.80: Poster
Dienstag, 26. Februar 2008, 14:30–20:00, Poster A
Self-assembly and tunneling transport characteristics of phenylthio-substituted coronenes on graphite — •Peter Kowalzik1, Silvia Karthäuser1, Jean-Manuel Raimundo2, Marc Gingras2, and Rainer Waser1 — 1Institute of Solid State Research and CNI, Research Center Juelich GmbH, 52425 Juelich, Germany — 2Département de Chimie, GCOM2, Université de La Méditerranée Aix-Marseille II, Case 901, 13288 Marseille Cedex 09, France
The use of conjugated (macro)molecules as components in molecular electronic devices is favoured because of the possibility to tune their electron transport properties through modifications of the size of the aromatic system and appropriate functionalisations in the periphery. Here we study the self-assembly and tunneling transport properties of dodecakis(phenylthio)coronene (DPTC) on graphite. DPTC shows an effective delocalisation of negative charges throughout the molecular system despite its overall nonplanarity. Layers of DPTC were deposited on the graphite surface from solution and characterised via UHV-STM/STS resulting in large highly ordered two dimensional supramolecular structures with several phases. Monolayers of DPTC adsorb with the coronene disc of the molecules lying flat on the graphite surface and arrange in stuctures with hexagonal symmetry. In addition clusters of several DPTC molecules of definite size are observed which again assemble into hexagonaly ordered films on the substrate. STS measurements reveal orbital mediated tunneling processes which were analysed by current-voltage curves.