Anisotropic Conductivity at the Single‐Molecule Scale

Afsari, Sepideh; Yasini, Parisa; Peng, Haowei; Perdew, John P.; Borguet, Eric

doi:10.1002/ange.201903898

Title: Anisotropic Conductivity at the Single‐Molecule Scale

Journal Article · 07 August 2019 · Angewandte Chemie

DOI: https://doi.org/10.1002/ange.201903898 · OSTI ID:1547605

Afsari, Sepideh ^[1]; Yasini, Parisa ^[1]; Peng, Haowei ^[2]; Perdew, John P. ^[3];

^[1]

Department of Chemistry Temple University 1901 N. 13th St. Philadelphia PA 19122 USA
Department of Physics Temple University 1925 N 12th St. Philadelphia PA 19122 USA
Department of Chemistry Temple University 1901 N. 13th St. Philadelphia PA 19122 USA, Department of Physics Temple University 1925 N 12th St. Philadelphia PA 19122 USA

Abstract In most junctions built by wiring a single molecule between two electrodes, the electrons flow along only one axis: between the two anchoring groups. However, molecules can be anisotropic, and an orientation‐dependent conductance is expected. Here, we fabricated single‐molecule junctions by using the electrode potential to control the molecular orientation and access individual elements of the conductivity tensor. We measured the conductance in two directions, along the molecular plane as the benzene ring bridges two electrodes using anchoring groups (upright) and orthogonal to the molecular plane with the molecule lying flat on the substrate (planar). The perpendicular (planar) conductance is about 400 times higher than that along the molecular plane (upright). This offers a new method for designing a reversible room‐temperature single‐molecule electromechanical switch that controllably employs the electrode potential to orient the molecule in the junction in either “ON” or “OFF” conductance states.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0012575

OSTI ID:: 1547605

Journal Information:: Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 40 Vol. 131; ISSN 0044-8249

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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