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. 2024 Feb;20(8):e2305607.
doi: 10.1002/smll.202305607. Epub 2023 Oct 10.

Highly Reversible Molecular Photoswitches with Transition Metal Dichalcogenides Electrodes

Li-Chuan Chen  1 , Jie Shi  1 , Zhi-Xing Lu  1 , Rong-Jian Lin  1 , Tai-Ge Lu  1 , Yu-Ling Zou  1 , Qing-Man Liang  1 , Ruiyun Huang  1 , Jia Shi  1 , Zong-Yuan Xiao  1 , Yanxi Zhang  1 , Junyang Liu  1 , Yang Yang  1 , Wenjing Hong  1
Affiliations

Highly Reversible Molecular Photoswitches with Transition Metal Dichalcogenides Electrodes

Li-Chuan Chen et al. Small. 2024 Feb.

Abstract

The molecule-electrode coupling plays an essential role in photoresponsive devices with photochromic molecules, and the strong coupling between the molecule and the conventional electrodes leads to/ the quenching effect and limits the reversibility of molecular photoswitches. In this work, we developed a strategy of using transition metal dichalcogenides (TMDCs) electrodes to fabricate the thiol azobenzene (TAB) self-assembled monolayers (SAMs) junctions with the eutectic gallium-indium (EGaIn) technique. The current-voltage characteristics of the EGaIn/GaOx //TAB/TMDCs photoswitches showed an almost 100% reversible photoswitching behavior, which increased by ∼28% compared to EGaIn/GaOx //TAB/AuTS photoswitches. Density functional theory (DFT) calculations showed the coupling strength of the TAB-TMDCs electrode decreased by 42% compared to that of the TAB-AuTS electrode, giving rise to improved reversibility. our work demonstrated the feasibility of 2D TMDCs for fabricating SAMs-based photoswitches with unprecedentedly high reversibility.

Keywords: EGaIn technique; molecular photoswitch; molecule-electrode coupling; self-assembled monolayer; transition metal dichalcogenides.

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