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Transition Voltage Spectroscopy of Porphyrin Molecular Wires

✍ Scribed by Neil Bennett; Gengzhao Xu; Louisa J. Esdaile; Harry L. Anderson; J. Emyr Macdonald; Martin Elliott

Book ID
104593530
Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
807 KB
Volume
6
Category
Article
ISSN
1613-6810

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✦ Synopsis

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/V^2^ displays a minimum at a characteristic “transition voltage” V~m~. 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.

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