Connections to the Electrodes Control the Transport Mechanism in Single-Molecule Transistors.
Angew Chem Int Ed Engl
; 63(16): e202401323, 2024 Apr 15.
Article
em En
| MEDLINE
| ID: mdl-38410064
ABSTRACT
When designing a molecular electronic device for a specific function, it is necessary to control whether the charge-transport mechanism is phase-coherent transmission or particle-like hopping. Here we report a systematic study of charge transport through single zinc-porphyrin molecules embedded in graphene nanogaps to form transistors, and show that the transport mechanism depends on the chemistry of the molecule-electrode interfaces. We show that van der Waals interactions between molecular anchoring groups and graphene yield transport characteristic of Coulomb blockade with incoherent sequential hopping, whereas covalent molecule-electrode amide bonds give intermediately or strongly coupled single-molecule devices that display coherent transmission. These findings demonstrate the importance of interfacial engineering in molecular electronic circuits.
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MEDLINE
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En
Ano de publicação:
2024
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Article