Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 11: Metal substrates: Adsorption of organic / bio molecules II
O 11.2: Vortrag
Montag, 23. März 2009, 15:15–15:30, SCH A118
Manipulation of conjugated molecular chains on Au(111) — •Leif Lafferentz1, Francisco Ample2, Hao Yu3, Stefan Hecht3, Christian Joachim2, and Leonhard Grill1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin — 2Nanosciences Group, CEMES-CNRS, 31055 Toulouse, France — 3Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin
The goal of molecular electronics is to utilize individual molecules as components in electronic devices. These units have to be linked by conducting connections. To achieve this, two conditions have to be met: First, the connections have to be robust while allowing efficient charge transfer. Furthermore, it is necessary to gain a basic understanding of the charge transport, which requires the ability to measure the current through single molecule junctions.
Solidly connected molecular structures of predetermined architecture could be produced with our method of on-surface synthesis [1]. In this way, conjugated chains with lengths of up to over 100 nm were formed from dibromoterfluorene (DBTF) molecules on a Au(111) surface. The chains are characterized and manipulated by means of low-temperature scanning tunneling microscopy (STM). It will be shown that it is possible to lift part of individual chains off the surface employing vertical manipulation with the STM tip, which opens the exciting possibility to measure currents through this molecular junction.
[1] L. Grill, M. Dyer, L. Lafferentz, M. Persson, M. V. Peters, and S. Hecht, Nature Nanotech. 2, 687 (2007)