Gap size dependent transition from direct tunneling to field emission in single molecule junctions
Article appeared in: Chemical Communications 2011, 47, 4760–4762; DOI: 10.1039/c1cc10144g
Dong Xiang, Yi Zhang, Feliks Pyatkov, Andreas Offenhäusser and Dirk Mayer
Published: March 2011
I/V characteristics recorded in mechanically controllable break junctions revealed that field emission transport is enhanced in single molecule junctions as the gap size between two nanoelectrodes is reduced. This observation indicates that Fowler–Nordheim tunneling occurs not only for intermolecular but also for intramolecular electron transport driven by a reduced energy barrier at short tunneling distances.