In situ superexchange electron transfer through a single molecule: a rectifying effect.

Proceedings of the National Academy of Sciences of the United States of America
A A KornyshevJens Ulstrup

Abstract

An increasingly comprehensive body of literature is being devoted to single-molecule bridge-mediated electronic nanojunctions, prompted by their prospective applications in molecular electronics and single-molecule analysis. These junctions may operate in gas phase or electrolyte solution (in situ). For biomolecules, the latter is much closer to their native environment. Convenient target molecules are aromatic molecules, peptides, oligonucleotides, transition metal complexes, and, broadly, molecules with repetitive units, for which the conducting orbitals are energetically well below electronic levels of the solvent. A key feature for these junctions is rectification in the current-voltage relation. A common view is that asymmetric molecules or asymmetric links to the electrodes are needed to acquire rectification. However, as we show here, this requirement could be different in situ, where a structurally symmetric system can provide rectification because of the Debye screening of the electric field in the nanogap if the screening length is smaller than the bridge length. The Galvani potentials of each electrode can be varied independently and lead to a transistor effect. We explore this behavior for the superexchange mechanis...Continue Reading

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Citations

Sep 19, 2012·Journal of the American Chemical Society·Nicola J KayRichard J Nichols
Sep 4, 2007·The Journal of Chemical Physics·Alexander M Kuznetsov
Nov 10, 2009·The Journal of Chemical Physics·Alexander M KuznetsovJens Ulstrup
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