Chemical control over the energy-level alignment in a two-terminal junction.

Abstract:

:The energy-level alignment of molecular transistors can be controlled by external gating to move molecular orbitals with respect to the Fermi levels of the source and drain electrodes. Two-terminal molecular tunnelling junctions, however, lack a gate electrode and suffer from Fermi-level pinning, making it difficult to control the energy-level alignment of the system. Here we report an enhancement of 2 orders of magnitude of the tunnelling current in a two-terminal junction via chemical molecular orbital control, changing chemically the molecular component between a stable radical and its non-radical form without altering the supramolecular structure of the junction. Our findings demonstrate that the energy-level alignment in self-assembled monolayer-based junctions can be regulated by purely chemical modifications, which seems an attractive alternative to control the electrical properties of two-terminal junctions.

journal_name

Nat Commun

journal_title

Nature communications

authors

Yuan L,Franco C,Crivillers N,Mas-Torrent M,Cao L,Sangeeth CSS,Rovira C,Veciana J,Nijhuis CA

doi

10.1038/ncomms12066

subject

Has Abstract

pub_date

2016-07-26 00:00:00

pages

12066

issn

2041-1723

pii

ncomms12066

journal_volume

7

pub_type

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