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Asymmetric electron transport realized by decoupling between molecule and electrode

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Asymmetric electron transport realized by decoupling between molecule and electrode

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dc.contributor.author Liu, Hongmei
dc.contributor.author Zhao, Jianwei
dc.contributor.author Boey, Freddy Yin Chiang
dc.contributor.author Zhang, Hua
dc.date.accessioned 2012-09-25T03:58:06Z
dc.date.available 2012-09-25T03:58:06Z
dc.date.copyright 2009
dc.date.issued 2012-09-25
dc.identifier.citation Liu, H., Zhao, J., Boey, F. Y. C., & Zhang, H. (2009). Asymmetric electron transport realized by decoupling between molecule and electrode. Physical Chemistry Chemical Physics, 11(44), 10323-10330.
dc.identifier.uri http://hdl.handle.net/10220/8632
dc.description.abstract We studied the contact coupling effect on the asymmetric electron transport in molecular junctions by the first-principles density functional theory incorporating with the non-equilibrium Green’s function method. To realize the decoupling, a rigid saturated ring is inserted into the metallic electrode and conjugated molecular bridge (linear oligo phenylene ethynylene and cyclic porphine). As a tunneling barrier, the saturated ring reduces the conductance by 2–3 orders of magnitude. However, the electronic decoupling greatly improves the asymmetric electron transport. In the case of the linear system, the favorite direction of electron transport is from the strong coupling end to the weak coupling one with a rectification ratio of 5 at 2.0 V. In addition, the rectification performance is sensitive to the molecular proportion of the molecular wire length and the tunneling barrier width. When the same barrier is applied, shortening the length of conjugated part can reduce rectification performance. The mechanism of rectification is analyzed by means of the potential drop, the spatial distribution of the molecular orbitals and the transmission spectra.
dc.language.iso en
dc.relation.ispartofseries Physical chemistry chemical physics
dc.rights © 2009 the Author(s). This is the author created version of a work that has been peer reviewed and accepted for publication by Physical Chemistry Chemical Physics, the Owner Societies. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [doi:http://dx.doi.org/10.1039/b914090e].
dc.subject DRNTU::Engineering::Materials.
dc.title Asymmetric electron transport realized by decoupling between molecule and electrode
dc.type Journal Article
dc.contributor.school School of Materials Science and Engineering
dc.identifier.doi http://dx.doi.org/10.1039/b914090e
dc.description.version Accepted version

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