Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 73: Nanostructures at Surfaces: Metals, Oxides and Semiconductors III
O 73.8: Vortrag
Mittwoch, 22. März 2017, 12:15–12:30, REC/PHY C213
Donor-acceptor-donor molecules for on-surface polymerization — •Dmitry Skidin1, Frank Eisenhut1, Justus Krüger1, Tim Erdmann2,3, Anton Kiriy2,3, Brigitte Voit2,3, Francesca Moresco1,2, and Gianaurelio Cuniberti1,2 — 1Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062 Dresden, Germany — 2Center for Advancing Electronics Dresden, TU Dresden, 01062 Dresden, Germany — 3Leibniz-Institut für Polymerforschung Dresden e. V., 01069 Dresden, Germany
One of the main tasks of the modern molecular electronics is the formation of supramolecular functional units for the circuitry at nanoscale. In this regard flexible molecular wires with finite band gap and high conductivity are of essential importance. Therefore, the molecules with alternating donor and acceptor units are perspective precursors for the formation of such wires. [1]
We employ conjugated diketopyrrolopyrrole-based molecules of the donor-acceptor-donor type to grow organic polymers on the surface. After the deposition of individual brominated monomers on Au(111) surface the sample is annealed to promote polymerization via Ullmann coupling. Structural and electronic properties of the stabilized molecular wires can be studied using low-temperature scanning tunneling microscopy and spectroscopy. STM lifting experiments are performed to investigate the conductance of the wires.
References:
1. C. Nacci, F. Ample, D. Bleger, S. Hecht, C. Joachim and L. Grill, Nat. Commun., 2015, 6, 7397.