Light-driven molecular switching achieves 6-order magnitude conductance change in OPE dimers

Alajmi, Asma and Alanazi, Bashayer and Alresheedi, Karimah and Alharbi, Kholood and Tremlett, William D. J. and Long, Nicholas J. and Lambert, Colin and Ismael, Ali (2025) Light-driven molecular switching achieves 6-order magnitude conductance change in OPE dimers. Nanoscale Advances. ISSN 2516-0230

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Abstract

Functional molecular devices have garnered significant research interest over the past ten years due to their promising potential for applications in both non-volatile memory and novel computing architectures. In this work, we investigate light-induced switching of electrical conductance in linear oligo(phenylene-ethylene)-based (OPE) molecules that incorporate an azobenzene bridging unit to form OPE dimers. We demonstrate that a light stimulus can cause electron transport through the molecule to switch from constructive to destructive quantum interference through an E to Z (trans to cis) azobenzene isomerisation, leading to an on–off conductance ratio of up to 6 orders of magnitude, which is comparable with the best molecular switches obtained to date.