Title

Controlling the direction of rectification in a molecular diode

Authors

Authors

L. Yuan; N. Nerngchamnong; L. Cao; H. Hamoudi; E. del Barco; M. Roemer; R. K. Sriramula; D. Thompson;C. A. Nijhuis

Comments

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Abbreviated Journal Title

Nat. Commun.

Keywords

SELF-ASSEMBLED MONOLAYERS; CHARGE-TRANSPORT; GRADIENT APPROXIMATION; TUNNELING JUNCTIONS; WORK FUNCTION; INTERFACES; DYNAMICS; DEVICES; WIRE; CONDUCTANCE; Multidisciplinary Sciences

Abstract

A challenge in molecular electronics is to control the strength of the molecule-electrode coupling to optimize device performance. Here we show that non-covalent contacts between the active molecular component (in this case, ferrocenyl of a ferrocenyl-alkanethiol self-assembled monolayer (SAM)) and the electrodes allow for robust coupling with minimal energy broadening of the molecular level, precisely what is required to maximize the rectification ratio of a molecular diode. In contrast, strong chemisorbed contacts through the ferrocenyl result in large energy broadening, leakage currents and poor device performance. By gradually shifting the ferrocenyl from the top to the bottom of the SAM, we map the shape of the electrostatic potential profile across the molecules and we are able to control the direction of rectification by tuning the ferrocenyl-electrode coupling parameters. Our demonstrated control of the molecule-electrode coupling is important for rational design of materials that rely on charge transport across organic-inorganic interfaces.

Journal Title

Nature Communications

Volume

6

Publication Date

1-1-2015

Document Type

Article

Language

English

First Page

11

WOS Identifier

WOS:000352717700001

ISSN

2041-1723

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