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Suppression of single-molecule conductance fluctuations using extended anchor groups on graphene and carbon-nanotube electrodes

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article number085443
<mark>Journal publication date</mark>23/08/2012
<mark>Journal</mark>Physical review B
Issue number8
Number of pages5
Publication StatusPublished
<mark>Original language</mark>English


Devices formed from single molecules attached to noble-metal electrodes exhibit large conductance fluctuations, which inhibit their development as reproducible functional units. We demonstrate that single molecules with planar anchor groups attached to carbon-based electrodes are more resilient to atomic-scale variation in the contacts and exhibit significantly lower conductance fluctuations. We examine the conductance of a 2,6-dibenzylamino core-substituted naphthalenediimide chromophore attached to carbon electrodes by either phenanthrene anchors or more extended anchor groups, which include oligophenylene ethynylene spacers. We demonstrate that for the more spatially extended anchor groups conductance fluctuations are significantly reduced. The current-voltage characteristic arising from long-range tunneling is found to be strongly nonlinear with pronounced conductance suppression below a threshold voltage of approximately 2.5 V.