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Exploring the Tilt-Angle Dependence of Electron Tunneling across Molecular Junctions of Self-Assembled Alkanethiols
Vise andre og tillknytning
2009 (engelsk)Inngår i: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 3, nr 8, s. 2073-2080Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Electronic transport mechanisms in molecular junctions are investigated by a combination of first-principles calculations and current-voltage measurements of several well-characterized structures. We study self-assembled layers of alkanethiols grown on Au(111) and form tunnel junctions by contacting the molecular layers with the tip of a conductive force microscope. Measurements done under low-load conditions permit us to obtain reliable tilt-angle and molecular length dependencies of the low-bias conductance through the alkanethiol layers. The observed dependence on tilt-angle is stronger for the longer molecular chains. Our calculations confirm the observed trends and explain them as a result of two mechanisms, namely, a previously proposed intermolecular tunneling enhancement as well as a hitherto overlooked tilt-dependent molecular gate effect.

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2009. Vol. 3, nr 8, s. 2073-2080
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Naturvetenskap, Fysik
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URN: urn:nbn:se:lnu:diva-2005DOI: 10.1021/nn9000808OAI: oai:DiVA.org:lnu-2005DiVA, id: diva2:309053
Tilgjengelig fra: 2010-04-06 Laget: 2010-04-06 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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