Asymmetric electron transport realized by decoupling between molecule and electrode
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 electro...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2012
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| Online Access: | https://hdl.handle.net/10356/95130 http://hdl.handle.net/10220/8632 |
| _version_ | 1826118776229199872 |
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| author | Liu, Hongmei Zhao, Jianwei Boey, Freddy Yin Chiang Zhang, Hua |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Liu, Hongmei Zhao, Jianwei Boey, Freddy Yin Chiang Zhang, Hua |
| author_sort | Liu, Hongmei |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T04:49:01Z |
| format | Journal Article |
| id | ntu-10356/95130 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:49:01Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | ntu-10356/951302023-07-14T15:56:52Z Asymmetric electron transport realized by decoupling between molecule and electrode Liu, Hongmei Zhao, Jianwei Boey, Freddy Yin Chiang Zhang, Hua School of Materials Science & Engineering DRNTU::Engineering::Materials 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. Accepted version 2012-09-25T03:58:06Z 2019-12-06T19:08:49Z 2012-09-25T03:58:06Z 2019-12-06T19:08:49Z 2009 2009 Journal Article 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. https://hdl.handle.net/10356/95130 http://hdl.handle.net/10220/8632 10.1039/b914090e en Physical chemistry chemical physics © 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]. application/pdf |
| spellingShingle | DRNTU::Engineering::Materials Liu, Hongmei Zhao, Jianwei Boey, Freddy Yin Chiang Zhang, Hua Asymmetric electron transport realized by decoupling between molecule and electrode |
| title | Asymmetric electron transport realized by decoupling between molecule and electrode |
| title_full | Asymmetric electron transport realized by decoupling between molecule and electrode |
| title_fullStr | Asymmetric electron transport realized by decoupling between molecule and electrode |
| title_full_unstemmed | Asymmetric electron transport realized by decoupling between molecule and electrode |
| title_short | Asymmetric electron transport realized by decoupling between molecule and electrode |
| title_sort | asymmetric electron transport realized by decoupling between molecule and electrode |
| topic | DRNTU::Engineering::Materials |
| url | https://hdl.handle.net/10356/95130 http://hdl.handle.net/10220/8632 |
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