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Electrostatic Fermi level tuning in large-scale self-assembled monolayers of oligo(phenylene–ethynylene) derivatives

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Electrostatic Fermi level tuning in large-scale self-assembled monolayers of oligo(phenylene–ethynylene) derivatives. / Wang, Xintai; Ismael, Ali; Ning, Shanglong et al.
In: Nanoscale Horizons, Vol. 7, No. 10, 01.10.2022, p. 1201-1209.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Wang, X, Ismael, A, Ning, S, Althobaiti, H, Al-Jobory, A, Girovsky, J, Astier, HPAG, O'Driscoll, LJ, Bryce, MR, Lambert, CJ & Ford, CJB 2022, 'Electrostatic Fermi level tuning in large-scale self-assembled monolayers of oligo(phenylene–ethynylene) derivatives', Nanoscale Horizons, vol. 7, no. 10, pp. 1201-1209. https://doi.org/10.1039/d2nh00241h

APA

Wang, X., Ismael, A., Ning, S., Althobaiti, H., Al-Jobory, A., Girovsky, J., Astier, H. P. A. G., O'Driscoll, L. J., Bryce, M. R., Lambert, C. J., & Ford, C. J. B. (2022). Electrostatic Fermi level tuning in large-scale self-assembled monolayers of oligo(phenylene–ethynylene) derivatives. Nanoscale Horizons, 7(10), 1201-1209. https://doi.org/10.1039/d2nh00241h

Vancouver

Wang X, Ismael A, Ning S, Althobaiti H, Al-Jobory A, Girovsky J et al. Electrostatic Fermi level tuning in large-scale self-assembled monolayers of oligo(phenylene–ethynylene) derivatives. Nanoscale Horizons. 2022 Oct 1;7(10):1201-1209. Epub 2022 Jul 26. doi: 10.1039/d2nh00241h

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Bibtex

@article{5270e599c6ce49a6a1ff536cdfcf5f00,
title = "Electrostatic Fermi level tuning in large-scale self-assembled monolayers of oligo(phenylene–ethynylene) derivatives",
abstract = "Understanding and controlling the orbital alignment of molecules placed between electrodes is essential in the design of practically-applicable molecular and nanoscale electronic devices. The orbital alignment is highly determined by the molecule-electrode interface. Dependence of orbital alignment on the molecular anchor group for single molecular junctions has been intensively studied; however, when scaling-up single molecules to large parallel molecular arrays (like self-assembled monolayers (SAMs)), two challenges need to be addressed: 1. Most desired anchor groups do not form high quality SAMs. 2. It is much harder to tune the frontier molecular orbitals via a gate voltage in SAM junctions than in single molecular junctions. In this work, we studied the effect of the molecule-electrode interface in SAMs with a micro-pore device, using a recently developed tetrapodal anchor to overcome challenge 1, and the combination of a single layered graphene top electrode with an ionic liquid gate to solve challenge 2. The zero-bias orbital alignment of different molecules was signalled by a shift in conductance minimum vs. gate voltage for molecules with different anchoring groups. Molecules with the same backbone, but a different molecule-electrode interface, were shown experimentally to have conductances that differ by a factor of 5 near zero bias. Theoretical calculations using density functional theory support the trends observed in the experimental data. This work sheds light on how to control electron transport within the HOMO-LUMO energy gap in molecular junctions and will be applicable in scaling up molecular electronic systems for future device applications.",
keywords = "General Materials Science",
author = "Xintai Wang and Ali Ismael and Shanglong Ning and Hanan Althobaiti and Alaa Al-Jobory and Jan Girovsky and Astier, {Hippolyte P. A. G.} and O'Driscoll, {Luke J.} and Bryce, {Martin R.} and Lambert, {Colin J.} and Ford, {Christopher J. B.}",
year = "2022",
month = oct,
day = "1",
doi = "10.1039/d2nh00241h",
language = "English",
volume = "7",
pages = "1201--1209",
journal = "Nanoscale Horizons",
issn = "2055-6764",
publisher = "Royal Society of Chemistry",
number = "10",

}

RIS

TY - JOUR

T1 - Electrostatic Fermi level tuning in large-scale self-assembled monolayers of oligo(phenylene–ethynylene) derivatives

AU - Wang, Xintai

AU - Ismael, Ali

AU - Ning, Shanglong

AU - Althobaiti, Hanan

AU - Al-Jobory, Alaa

AU - Girovsky, Jan

AU - Astier, Hippolyte P. A. G.

AU - O'Driscoll, Luke J.

AU - Bryce, Martin R.

AU - Lambert, Colin J.

AU - Ford, Christopher J. B.

PY - 2022/10/1

Y1 - 2022/10/1

N2 - Understanding and controlling the orbital alignment of molecules placed between electrodes is essential in the design of practically-applicable molecular and nanoscale electronic devices. The orbital alignment is highly determined by the molecule-electrode interface. Dependence of orbital alignment on the molecular anchor group for single molecular junctions has been intensively studied; however, when scaling-up single molecules to large parallel molecular arrays (like self-assembled monolayers (SAMs)), two challenges need to be addressed: 1. Most desired anchor groups do not form high quality SAMs. 2. It is much harder to tune the frontier molecular orbitals via a gate voltage in SAM junctions than in single molecular junctions. In this work, we studied the effect of the molecule-electrode interface in SAMs with a micro-pore device, using a recently developed tetrapodal anchor to overcome challenge 1, and the combination of a single layered graphene top electrode with an ionic liquid gate to solve challenge 2. The zero-bias orbital alignment of different molecules was signalled by a shift in conductance minimum vs. gate voltage for molecules with different anchoring groups. Molecules with the same backbone, but a different molecule-electrode interface, were shown experimentally to have conductances that differ by a factor of 5 near zero bias. Theoretical calculations using density functional theory support the trends observed in the experimental data. This work sheds light on how to control electron transport within the HOMO-LUMO energy gap in molecular junctions and will be applicable in scaling up molecular electronic systems for future device applications.

AB - Understanding and controlling the orbital alignment of molecules placed between electrodes is essential in the design of practically-applicable molecular and nanoscale electronic devices. The orbital alignment is highly determined by the molecule-electrode interface. Dependence of orbital alignment on the molecular anchor group for single molecular junctions has been intensively studied; however, when scaling-up single molecules to large parallel molecular arrays (like self-assembled monolayers (SAMs)), two challenges need to be addressed: 1. Most desired anchor groups do not form high quality SAMs. 2. It is much harder to tune the frontier molecular orbitals via a gate voltage in SAM junctions than in single molecular junctions. In this work, we studied the effect of the molecule-electrode interface in SAMs with a micro-pore device, using a recently developed tetrapodal anchor to overcome challenge 1, and the combination of a single layered graphene top electrode with an ionic liquid gate to solve challenge 2. The zero-bias orbital alignment of different molecules was signalled by a shift in conductance minimum vs. gate voltage for molecules with different anchoring groups. Molecules with the same backbone, but a different molecule-electrode interface, were shown experimentally to have conductances that differ by a factor of 5 near zero bias. Theoretical calculations using density functional theory support the trends observed in the experimental data. This work sheds light on how to control electron transport within the HOMO-LUMO energy gap in molecular junctions and will be applicable in scaling up molecular electronic systems for future device applications.

KW - General Materials Science

U2 - 10.1039/d2nh00241h

DO - 10.1039/d2nh00241h

M3 - Journal article

VL - 7

SP - 1201

EP - 1209

JO - Nanoscale Horizons

JF - Nanoscale Horizons

SN - 2055-6764

IS - 10

ER -