Single-Molecule Transport at a Rectifying GaAs Contact.



Vezzoli, A, Brooke, RJ, Ferri, N, Higgins, SJ, Schwarzacher, W and Nichols, RJ
(2017) Single-Molecule Transport at a Rectifying GaAs Contact. Nano Lett, 17 (2). 1109 - 1115. ISSN 1530-6992

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Abstract

In most single- or few-molecule devices, the contact electrodes are simple ohmic resistors. Here we describe a new type of single-molecule device in which metal and semiconductor contact electrodes impart a function, namely, current rectification, which is then modified by a molecule bridging the gap. We study junctions with the structure Au STM tip/X/n-GaAs substrate, where "X" is either a simple alkanedithiol or a conjugated unit bearing thiol/methylthiol contacts, and we detect current jumps corresponding to the attachment and detachment of single molecules. From the magnitudes of the current jumps we can deduce values for the conductance decay constant with molecule length that agree well with values determined from Au/molecule/Au junctions. The ability to impart functionality to a single-molecule device through the properties of the contacts as well as through the properties of the molecule represents a significant extension of the single-molecule electronics "tool-box".

Item Type: Article
Uncontrolled Keywords: STM, Schottky diode, gallium arsenide, rectification, single molecule junctions
Depositing User: Symplectic Admin
Date Deposited: 16 Jan 2017 15:51
Last Modified: 19 Jan 2023 07:20
DOI: 10.1021/acs.nanolett.6b04663
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3005256

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