Journal
SMALL
Volume 6, Issue 22, Pages 2604-2611Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201001046
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Funding
- EPSRC
- EPSRC [EP/D076072/1, EP/D076552/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/D076552/1, EP/D076072/1] Funding Source: researchfish
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Measurements of the current-voltage (I-V) characteristics of individual thiol-tethered porphyrin molecules (isolated in an alkanethiol matrix) and of self-assembled monolayers are presented. 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 is observed, which is consistent with parallel conduction through many molecules.
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