Conductance of a single flexible molecular wire composed of alternating donor and acceptor units

Christophe Nacci, Francisco Ample, David Bleger, Stefan Hecht (), Christian Joachim and Leonhard Grill ()
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Christophe Nacci: Fritz-Haber-Institute of the Max-Planck-Society
Francisco Ample: Institute of Materials Research and Engineering (IMRE)
David Bleger: Humboldt-Universität zu Berlin
Stefan Hecht: Humboldt-Universität zu Berlin
Christian Joachim: Nanosciences Group and MANA Satellite, CEMES-CNRS
Leonhard Grill: Fritz-Haber-Institute of the Max-Planck-Society

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract Molecular-scale electronics is mainly concerned by understanding charge transport through individual molecules. A key issue here is the charge transport capability through a single—typically linear—molecule, characterized by the current decay with increasing length. To improve the conductance of individual polymers, molecular design often either involves the use of rigid ribbon/ladder-type structures, thereby sacrificing for flexibility of the molecular wire, or a zero band gap, typically associated with chemical instability. Here we show that a conjugated polymer composed of alternating donor and acceptor repeat units, synthesized directly by an on-surface polymerization, exhibits a very high conductance while maintaining both its flexible structure and a finite band gap. Importantly, electronic delocalization along the wire does not seem to be necessary as proven by spatial mapping of the electronic states along individual molecular wires. Our approach should facilitate the realization of flexible ‘soft’ molecular-scale circuitry, for example, on bendable substrates.

Date: 2015
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DOI: 10.1038/ncomms8397

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