Exploring the Tilt-Angle Dependence of Electron Tunneling across Molecular Junctions of Self-Assembled Alkanethiols

Frederiksen, Thomas (author)

Munuera, C (author)

Ocal, C (author)

Brandbyge, Mads (author)

Paulsson, Magnus (author): Högskolan i Kalmar,Naturvetenskapliga institutionen

Sanches-Portal, D (author)

Arnau, A (author)

(creator_code:org_t)

2009-07-28
2009
English.
In: ACS Nano. - : American Chemical Society (ACS). - 1936-0851 .- 1936-086X. ; 3:8, s. 2073-2080

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; show less...

Abstract Subject headings

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.

By the author/editor: Frederiksen, Tho ...; Munuera, C; Ocal, C; Brandbyge, Mads; Paulsson, Magnus; Sanches-Portal, ...; show more...; Arnau, A; show less...

About the subject

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