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Cross-plane conductance through a graphene/molecular monolayer/Au sandwich

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Cross-plane conductance through a graphene/molecular monolayer/Au sandwich. / Li, Bing; Famili, Marjan; Pensa, Evangelina; Grace, Iain; Long, Nicholas J.; Lambert, C.; Albrecht, Tim; Cohen, Lesley F.

In: Nanoscale, Vol. 10, No. 42, 14.11.2018, p. 19791-19798.

Research output: Contribution to journalJournal articlepeer-review

Harvard

Li, B, Famili, M, Pensa, E, Grace, I, Long, NJ, Lambert, C, Albrecht, T & Cohen, LF 2018, 'Cross-plane conductance through a graphene/molecular monolayer/Au sandwich', Nanoscale, vol. 10, no. 42, pp. 19791-19798. https://doi.org/10.1039/c8nr06763e

APA

Li, B., Famili, M., Pensa, E., Grace, I., Long, N. J., Lambert, C., Albrecht, T., & Cohen, L. F. (2018). Cross-plane conductance through a graphene/molecular monolayer/Au sandwich. Nanoscale, 10(42), 19791-19798. https://doi.org/10.1039/c8nr06763e

Vancouver

Author

Li, Bing ; Famili, Marjan ; Pensa, Evangelina ; Grace, Iain ; Long, Nicholas J. ; Lambert, C. ; Albrecht, Tim ; Cohen, Lesley F. / Cross-plane conductance through a graphene/molecular monolayer/Au sandwich. In: Nanoscale. 2018 ; Vol. 10, No. 42. pp. 19791-19798.

Bibtex

@article{3b3fd0b628ba4d30a496ca4b37b43244,
title = "Cross-plane conductance through a graphene/molecular monolayer/Au sandwich",
abstract = "The functionalities offered by single-molecule electrical junctions are yet to be translated into monolayer or few-layer molecular films, where making effective and reproducible electrical contact is one of the challenging bottlenecks. Here we take a significant step in this direction by demonstrating that excellent electrical contact can be made with a monolayer biphenyl-4,4′-dithiol (BPDT) molecular film, sandwiched between gold and graphene electrodes. This sandwich device structure is advantageous, because the current flows through the molecules to the gold substrate in a 'cross-plane' manner, perpendicular to the plane of graphene, yielding high-conductance devices. We elucidate the nature of the cross-plane graphene/molecule/Au transport using quantum transport calculations and introduce a simple analytical model, which captures generic features of the current-voltage characteristic. Asymmetry in junction properties results from the disparity in electrode electrical properties, the alignment of the BPDT HOMO-LUMO energy levels and the specific characteristics of the graphene electrode. The experimental observation of scalability of junction properties within the junction area, in combination with a theoretical description of the transmission probability of the thiol-graphene contact, demonstrates that between 10% and 100% of the molecules make contact with the electrodes, which is several orders of magnitude greater than that achieved to date in the literature. {\textcopyright} 2018 The Royal Society of Chemistry.",
keywords = "Current voltage characteristics, Electric contacts, Electrochemical electrodes, Gold, Graphite electrodes, Molecules, Monolayers, Quantum chemistry, Quantum electronics, Electrical contacts, Electrical junctions, Graphene contacts, Graphene electrodes, HOMO-LUMO energies, Junction properties, Orders of magnitude, Transmission probabilities, Graphene",
author = "Bing Li and Marjan Famili and Evangelina Pensa and Iain Grace and Long, {Nicholas J.} and C. Lambert and Tim Albrecht and Cohen, {Lesley F.}",
year = "2018",
month = nov,
day = "14",
doi = "10.1039/c8nr06763e",
language = "English",
volume = "10",
pages = "19791--19798",
journal = "Nanoscale",
issn = "2040-3364",
publisher = "Royal Society of Chemistry",
number = "42",

}

RIS

TY - JOUR

T1 - Cross-plane conductance through a graphene/molecular monolayer/Au sandwich

AU - Li, Bing

AU - Famili, Marjan

AU - Pensa, Evangelina

AU - Grace, Iain

AU - Long, Nicholas J.

AU - Lambert, C.

AU - Albrecht, Tim

AU - Cohen, Lesley F.

PY - 2018/11/14

Y1 - 2018/11/14

N2 - The functionalities offered by single-molecule electrical junctions are yet to be translated into monolayer or few-layer molecular films, where making effective and reproducible electrical contact is one of the challenging bottlenecks. Here we take a significant step in this direction by demonstrating that excellent electrical contact can be made with a monolayer biphenyl-4,4′-dithiol (BPDT) molecular film, sandwiched between gold and graphene electrodes. This sandwich device structure is advantageous, because the current flows through the molecules to the gold substrate in a 'cross-plane' manner, perpendicular to the plane of graphene, yielding high-conductance devices. We elucidate the nature of the cross-plane graphene/molecule/Au transport using quantum transport calculations and introduce a simple analytical model, which captures generic features of the current-voltage characteristic. Asymmetry in junction properties results from the disparity in electrode electrical properties, the alignment of the BPDT HOMO-LUMO energy levels and the specific characteristics of the graphene electrode. The experimental observation of scalability of junction properties within the junction area, in combination with a theoretical description of the transmission probability of the thiol-graphene contact, demonstrates that between 10% and 100% of the molecules make contact with the electrodes, which is several orders of magnitude greater than that achieved to date in the literature. © 2018 The Royal Society of Chemistry.

AB - The functionalities offered by single-molecule electrical junctions are yet to be translated into monolayer or few-layer molecular films, where making effective and reproducible electrical contact is one of the challenging bottlenecks. Here we take a significant step in this direction by demonstrating that excellent electrical contact can be made with a monolayer biphenyl-4,4′-dithiol (BPDT) molecular film, sandwiched between gold and graphene electrodes. This sandwich device structure is advantageous, because the current flows through the molecules to the gold substrate in a 'cross-plane' manner, perpendicular to the plane of graphene, yielding high-conductance devices. We elucidate the nature of the cross-plane graphene/molecule/Au transport using quantum transport calculations and introduce a simple analytical model, which captures generic features of the current-voltage characteristic. Asymmetry in junction properties results from the disparity in electrode electrical properties, the alignment of the BPDT HOMO-LUMO energy levels and the specific characteristics of the graphene electrode. The experimental observation of scalability of junction properties within the junction area, in combination with a theoretical description of the transmission probability of the thiol-graphene contact, demonstrates that between 10% and 100% of the molecules make contact with the electrodes, which is several orders of magnitude greater than that achieved to date in the literature. © 2018 The Royal Society of Chemistry.

KW - Current voltage characteristics

KW - Electric contacts

KW - Electrochemical electrodes

KW - Gold

KW - Graphite electrodes

KW - Molecules

KW - Monolayers

KW - Quantum chemistry

KW - Quantum electronics

KW - Electrical contacts

KW - Electrical junctions

KW - Graphene contacts

KW - Graphene electrodes

KW - HOMO-LUMO energies

KW - Junction properties

KW - Orders of magnitude

KW - Transmission probabilities

KW - Graphene

U2 - 10.1039/c8nr06763e

DO - 10.1039/c8nr06763e

M3 - Journal article

VL - 10

SP - 19791

EP - 19798

JO - Nanoscale

JF - Nanoscale

SN - 2040-3364

IS - 42

ER -