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Prevalence of Coulomb blockade in electro-migrated junctions with conjugated and non-conjugated molecules

A de Picciotto1, J E Klare1, C Nuckolls1, K Baldwin2, A Erbe2 and R Willett2

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Conduction of electro-migration gap junctions coated with various organic molecules is studied to expose the prevalence of different transport processes. The principal comparison made here is between molecules with conjugated versus non-conjugated backbones. Coulomb blockade (CB) is observed in all junctions, including bare junctions and those with non-conjugated molecules, but at significantly lower prevalence than for conjugated molecules. Importantly, CB with high charging energy is seen almost exclusively on junctions with conjugated molecules. These results indicate that CB is ubiquitous in molecular electro-migration junction transport with prevalence that should be characterized using large numbers of samples.


PACS

85.35.Gv Single electron devices

Subjects

Electronics and devices

Nanoscale science and low-D systems

Dates

Issue 12 (December 2005)

Received 5 July 2005, in final form 20 September 2005

Published 11 November 2005



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