Gating of single molecule junction conductance by charge transfer complex formation

The solid-state structures of organic charge transfer (CT) salts are critical in determining their mode of charge transport, and hence their unusual electrical properties, which range from semiconducting through metallic to superconducting. In contrast, using both theory and experiment, we show here...

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Bibliographic Details
Published in:Nanoscale 2015-12, Vol.7 (45), p.18949-18955
Main Authors: Vezzoli, Andrea, Grace, Iain, Brooke, Carly, Wang, Kun, Lambert, Colin J, Xu, Bingqian, Nichols, Richard J, Higgins, Simon J
Format: Article
Language:English
Subjects:
Charge transfer
Complex formation
Conductance
Electrical junctions
Electrical properties
Fermi surfaces
Gating and risering
Superconductivity
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Summary:The solid-state structures of organic charge transfer (CT) salts are critical in determining their mode of charge transport, and hence their unusual electrical properties, which range from semiconducting through metallic to superconducting. In contrast, using both theory and experiment, we show here that the conductance of metal |single molecule| metal junctions involving aromatic donor moieties (dialkylterthiophene, dialkylbenzene) increase by over an order of magnitude upon formation of charge transfer (CT) complexes with tetracyanoethylene (TCNE). This enhancement occurs because CT complex formation creates a new resonance in the transmission function, close to the metal contact Fermi energy, that is a signal of room-temperature quantum interference.
ISSN:2040-3364
2040-3372
DOI:10.1039/c5nr04420k