Device structure for electronic transport through individual molecules using nanoelectrodes

Subhasis Ghosh; Henny Halimun; Ajit Kumar Mahapatro; Jaewon Choi; Saurabh Lodha; David Janes

doi:10.1063/1.2140470

journal article Dec 02, 2005

Device structure for electronic transport through individual molecules using nanoelectrodes

Subhasis Ghosh Henny Halimun Ajit Kumar Mahapatro Jaewon Choi

Saurabh Lodha

David Janes

Applied Physics Letters Vol. 87 No. 23 · AIP Publishing

View at Publisher Save 10.1063/1.2140470

Abstract

We present a simple and reliable method for making electrical contacts to small organic molecules with thiol endgroups. Nanometer-scale gaps between metallic electrodes have been fabricated by passing a large current through a lithographically-patterned Au-line with appropriate thickness. Under appropriate conditions, the passage of current breaks the Au-line, creating two opposite facing electrodes separated by a gap comparable to the length of small organic molecules. Current-voltage characteristics have been measured both before and after deposition of short organic molecules. The resistance of single 1,4-benzenedithiol and 1,4-bezenedimethanedithiol molecules were found to be 9MΩ and 26MΩ, respectively. The experimental results indicate strong electronic coupling to the contacts and are discussed using a relatively simple model of mesoscopic transport. The use of electrodes formed on an insulating surface by lithography and electromigration provides a stable structure suitable for integrated circuit applications.

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Metrics

53

Citations

20

References

Details

Published: Dec 02, 2005
Vol/Issue: 87(23)

Authors

S

Subhasis Ghosh

Jawaharlal Nehru University School of Physical Sciences, , New Delhi 110067, India

H

Henny Halimun