Transition voltage spectroscopy of porphyrin molecular wires

Bennett, Neil, Xu, Gengzhao, Esdaile, Louisa J., Anderson, Harry L., Macdonald, John Emyr ORCID: https://orcid.org/0000-0001-5504-1692 and Elliott, Martin ORCID: https://orcid.org/0000-0002-9254-9898 2010. Transition voltage spectroscopy of porphyrin molecular wires. Small 6 (22) , pp. 2604-2611. 10.1002/smll.201001046

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Abstract

Measurements are presented of the current-voltage (I–V) characteristics of individual thiol-tethered porphyrin molecules (isolated in an alkanethiol matrix) and of self-assembled monolayers. In both cases, it is found that I/V2 displays a minimum at a characteristic “transition voltage” Vm. Repeated measurements of the transition voltage enable both its time development and statistical behavior to be determined. For isolated molecules, the transition voltage shows a multipeaked distribution of values, indicating the presence of a small number of distinct molecular/contact configurations, each having different transport characteristics. For self-assembled monolayers, in contrast, a single-peaked distribution was observed, which is consistent with parallel conduction through many molecules

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Uncontrolled Keywords:	Contact asymmetry ; Porphyrins ; Single molecules ; Scanning tunneling microscopytransition voltage spectroscopy
Publisher:	Wiley
ISSN:	1613-6810
Last Modified:	17 Oct 2022 10:10
URI:	https://orca.cardiff.ac.uk/id/eprint/7283

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