Transition voltage spectroscopy of porphyrin molecular wires |
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Authors: | Bennett Neil Xu Gengzhao Esdaile Louisa J Anderson Harry L Macdonald J Emyr Elliott Martin |
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Affiliation: | School of Physics and Astronomy, Cardiff University, 5 The Parade, Cardiff CF24 3AA, UK. bennettn1@cardiff.ac.uk |
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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/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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Keywords: | contact asymmetry porphyrins single molecules scanning tunneling microscopytransition voltage spectroscopy |
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