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

Peterfalvi, Csaba and Lambert, Colin (2012) Suppression of single-molecule conductance fluctuations using extended anchor groups on graphene and carbon-nanotube electrodes. Physical Review B, 86 (8). ISSN 1098-0121

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Abstract

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.

Item Type: Article
Journal or Publication Title: Physical Review B
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 58248
Deposited By: ep_importer_pure
Deposited On: 18 Sep 2012 16:16
Refereed?: Yes
Published?: Published
Last Modified: 30 Sep 2013 12:41
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/58248

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