Tuning Charge Transport in Aromatic‐Ring Single‐Molecule Junctions via Ionic‐Liquid Gating

Achieving gate control with atomic precision, which is crucial to the transistor performance on the smallest scale, remains a challenge. Herein we report a new class of aromatic‐ring molecular nanotransistors based on graphene–molecule–graphene single‐molecule junctions by using an ionic‐liquid gate...

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Published inAngewandte Chemie International Edition Vol. 57; no. 43; pp. 14026 - 14031
Main Authors Xin, Na, Li, Xingxing, Jia, Chuancheng, Gong, Yao, Li, Mingliang, Wang, Shuopei, Zhang, Guangyu, Yang, Jinlong, Guo, Xuefeng
Format Journal Article
LanguageEnglish
Published Germany Wiley Subscription Services, Inc 22.10.2018
EditionInternational ed. in English
Subjects
aromatic rings
Charge transport
Electronic devices
Electronic equipment
Energy levels
Gating
Graphene
Ionic liquids
Semiconductor devices
single-molecule junction
Transistors
Tuning
aromatic rings
ionic liquids
charge transport
graphene
single-molecule junction
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Summary:Achieving gate control with atomic precision, which is crucial to the transistor performance on the smallest scale, remains a challenge. Herein we report a new class of aromatic‐ring molecular nanotransistors based on graphene–molecule–graphene single‐molecule junctions by using an ionic‐liquid gate. Experimental phenomena and theoretical calculations confirm that this ionic‐liquid gate can effectively modulate the alignment between molecular frontier orbitals and the Fermi energy level of graphene electrodes, thus tuning the charge‐transport properties of the junctions. In addition, with a small gate voltage (|VG|≤1.5 V) ambipolar charge transport in electrochemically inactive molecular systems (EG>3.5 eV) is realized. These results offer a useful way to build high‐performance single‐molecule transistors, thus promoting the prospects for molecularly engineered electronic devices. Liquid gates: Aromatic‐ring molecular nanotransistors with an ionic‐liquid gate are realized on graphene–molecule–graphene single‐molecule junctions. Experimental and theoretical results show that the ionic‐liquid gate can modulate the alignment between molecular frontier orbitals and the Fermi energy level of graphene electrodes, thus leading to charge transport in electrochemically inactive molecular systems.
Bibliography:These authors contributed equally to this work.
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ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201807465