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Title: Asymmetric electron transport realized by decoupling between molecule and electrode
Authors: Liu, Hongmei
Zhao, Jianwei
Boey, Freddy Yin Chiang
Zhang, Hua
Keywords: DRNTU::Engineering::Materials
Issue Date: 2009
Source: 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.
Series/Report no.: Physical chemistry chemical physics
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.
DOI: 10.1039/b914090e
Schools: School of Materials Science & Engineering 
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:].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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