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Single-molecule rectifiers based on voltage-dependent deformation of molecular orbitals in carbazole oligomers

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Abstract

Current–voltage characteristics of single molecule junctions are governed both by the energy level alignment of molecular orbitals with respect to the Fermi level of the electrodes and by the hybridization of electronic structures at the interface between the molecule and the electrodes. While there have been many studies on tuning the former, only a few works intended to control the latter. In the present study, we demonstrate that molecular junctions based on carbazole oligomers showed a current rectification behavior due to asymmetric–symmetric control of electronic hybridization between the molecule and electrodes at the both terminals. The carbazole oligomers originally showed an asymmetric molecular orbital and, hence, electronic hybridization with the electrodes because of the electric dipole moment. Symmetric electronic hybridization was achieved when the applied electric field between electrodes deformed molecular orbital to be symmetric. This is a novel way to control charge transport in single-molecule junctions.

Graphical abstract: Single-molecule rectifiers based on voltage-dependent deformation of molecular orbitals in carbazole oligomers

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Publication details

The article was received on 27 Jul 2018, accepted on 09 Oct 2018 and first published on 10 Oct 2018


Article type: Paper
DOI: 10.1039/C8NR06049E
Citation: Nanoscale, 2018, Advance Article
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    Single-molecule rectifiers based on voltage-dependent deformation of molecular orbitals in carbazole oligomers

    R. Yamada, K. Albrecht, T. Ohto, K. Minode, K. Yamamoto and H. Tada, Nanoscale, 2018, Advance Article , DOI: 10.1039/C8NR06049E

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