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Electronic transport in single molecule junctions: Control of the molecule-electrode coupling through intramolecular tunneling barriers

Andrey Danilov (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Sergey Kubatkin (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Sergey Kafanov (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; P. Hedegard ; N. Stuhr-Hansen ; K. Moth-Poulsen ; T. Bjornholm
Nano Letters (1530-6984 ). Vol. 8 (2008), 1, p. 1-5 .
[Artikel, refereegranskad vetenskaplig]

We report on single molecule electron transport measurements of two oligophenylenevinylene (OPV3) derivatives placed in a nanogap between gold (Au) or lead (Pb) electrodes in a field effect transistor device. Both derivatives contain thiol end groups that allow chemical binding to the electrodes. One derivative has additional methylene groups separating the thiols from the delocalized pi-electron system. The insertion of methylene groups changes the open state conductance by 3-4 orders of magnitude and changes the transport mechanism from a coherent regime with finite zero-bias conductance to sequential tunneling and Coulomb blockade behavior.


Denna post skapades 2009-01-06.
CPL Pubid: 83613