TY - JOUR

T1 - Effective Gating in Single-Molecule Junctions through Fano Resonances

AU - Prindle, Claudia R.

AU - Shi, Wanzhuo

AU - Li, Liang

AU - Dahl Jensen, Jesper

AU - Laursen, Bo W.

AU - Steigerwald, Michael L.

AU - Nuckolls, Colin

AU - Venkataraman, Latha

N1 - Funding Information: C.R.P. was supported by a National Defense Science and Engineering Graduate Fellowship. W.S. was supported by the U.S.-Israel Binational Science Foundation Award 2020327. L.L. was supported by the National Science Foundation Award NSF DMR-2241180. We thank Dr. Scott Docherty for help with molecular rendering and scientific discussions. Publisher Copyright: © 2024 American Chemical Society.

PY - 2024

Y1 - 2024

N2 - The successful incorporation of molecules as active circuit elements relies on the ability to tune their electronic properties through chemical design. A synthetic strategy that has been used to manipulate and gate circuit conductance involves attaching a pendant substituent along the molecular conduction pathway. However, such a chemical gate has not yet been shown to significantly modify conductance. Here, we report a novel series of triarylmethylium and triangulenium carbocations gated by different substituents coupled to the delocalized conducting orbitals on the molecular backbone through a Fano resonance. By changing the pendant substituents to modulate the position of the Fano resonance and its coupling to the conducting orbitals, we can regulate the junction conductance by a remarkable factor of 450. This work thus provides a new design principle to enable effective chemical gating of single-molecule devices toward effective molecular transistors.

AB - The successful incorporation of molecules as active circuit elements relies on the ability to tune their electronic properties through chemical design. A synthetic strategy that has been used to manipulate and gate circuit conductance involves attaching a pendant substituent along the molecular conduction pathway. However, such a chemical gate has not yet been shown to significantly modify conductance. Here, we report a novel series of triarylmethylium and triangulenium carbocations gated by different substituents coupled to the delocalized conducting orbitals on the molecular backbone through a Fano resonance. By changing the pendant substituents to modulate the position of the Fano resonance and its coupling to the conducting orbitals, we can regulate the junction conductance by a remarkable factor of 450. This work thus provides a new design principle to enable effective chemical gating of single-molecule devices toward effective molecular transistors.

U2 - 10.1021/jacs.3c14226

DO - 10.1021/jacs.3c14226

M3 - Journal article

C2 - 38293735

AN - SCOPUS:85184573193

VL - 146

SP - 3646

EP - 3650

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

SN - 0002-7863

IS - 6

ER -