4.8 Article

Efficient Spin-Selective Electron Transport at Low Voltages of Thia-Bridged Triarylamine Hetero[4]helicenes Chemisorbed Monolayer

Journal

ACS NANO
Volume 17, Issue 15, Pages 15189-15198

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsnano.3c04878

Keywords

Chirality; Helicenes; Self-assembledmonolayers; molecular spintronics; CISS effect

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This study investigates the spin selectivity properties of a monolayer of a thioalkyl derivative on a gold surface and finds that it can act as a spin filter, discriminating flowing electrons according to their spin state based on the molecules' chirality. These results demonstrate that thioalkyl derivatives are important candidates for the development of chiral spintronic devices.
The Chirality InducedSpin Selectivity (CISS) effect describesthe capability of chiral molecules to act as spin filters discriminatingflowing electrons according to their spin state. Within molecularspintronics, efforts are focused on developing chiral-molecule-basedtechnologies to control the injection and coherence of spin-polarizedcurrents. Herein, for this purpose, we study spin selectivity propertiesof a monolayer of a thioalkyl derivative of a thia-bridged triarylaminehetero[4]helicene chemisorbed on a gold surface. A stacked deviceassembled by embedding a monolayer of these molecules between ferromagneticand diamagnetic electrodes exhibits asymmetric magnetoresistance withinversion of the signal according to the handedness of molecules,in line with the presence of the CISS effect. In addition, magneticallyconductive atomic force microscopy reveals efficient electron spinfiltering even at unusually low potentials. Our results demonstratethat thia[4]heterohelicenes represent key candidates for the developmentof chiral spintronic devices.

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