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Authors
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Skidin, D. ; Erdmann, T. ; Nikipar, S. ; Eisenhut, F. ; Krüger, J. ; Günther, F. ; Kiriy, A. ; Voit, B. ; Ryndyk, D. ; Joachim, C. ; Moresco, F. ; Cuniberti, G.
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Title
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Tuning the conductance of a molecular wire by the interplay of donor and acceptor units
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Date
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28.08.2018
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Number
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55891
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Abstract
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We investigate the conductance of optimized donor–acceptor–donor molecular wires obtained by on-surface synthesis on the Au(111) surface. A careful balance between acceptors and donors is achieved using a diketopyrrolopyrrole acceptor and two thiophene donors per unit along the wire. Scanning tunneling microscopy imaging, spectroscopy, and conductance measurements done by pulling a single molecular wire at one end are presented. We show that the conductance of the obtained wires is among the highest reported so far in a tunneling transport regime, with an inverse decay length of 0.17 Å-1. Using complex band structure calculations, different donor and acceptor groups are discussed, showing how a balanced combination of donor and acceptor units along the wire can further minimize the decay of the tunneling current with length.
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Publisher
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Nanoscale
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Wikidata
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Citation
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Nanoscale 10 (2018) 17131-17139
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DOI
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https://doi.org/10.1039/C8NR05031G
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Tags
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