Details

Autor(en) / Beteiligte

• Nazin, G V
• Wu, S W
• W Ho

Titel

Molecular Electronics Special Feature: Tunneling rates in electron transport through double-barrier molecular junctions in a scanning tunneling microscope

Ist Teil von

• Proceedings of the National Academy of Sciences - PNAS, 2005-06, Vol.102 (25), p.8832

Ort / Verlag

Washington: National Academy of Sciences

Erscheinungsjahr

2005

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• The scanning tunneling microscope enables atomic-scale measurements of electron transport through individual molecules. Copper phthalocyanine and magnesium porphine molecules adsorbed on a thin oxide film grown on the NiAl(110) surface were probed. The single-molecule junctions contained two tunneling barriers, vacuum gap, and oxide film. Differential conductance spectroscopy shows that electron transport occurs via vibronic states of the molecules. The intensity of spectral peaks corresponding to the individual vibronic states depends on the relative electron tunneling rates through the two barriers of the junction, as found by varying the vacuum gap tunneling rate by changing the height of the scanning tunneling microscope tip above the molecule. A simple, sequential tunneling model explains the observed trends. [PUBLICATION ABSTRACT]