Bias-Driven Conductance Increase with Length in Porphyrin Tapes
Author
Leary, Edmund; Limburg, Bart; Alanazy, Asma; Sangtarash, Sara; Grace, Iain; Swada, Katsutoshi; Esdaile, Louisa J.; Noori, Mohammed; González, M. Teresa; Rubio Bollinger, Gabino; Sadeghi, Hatef; Hodgson, Andrew; Agrait de la Puente, Mario Nicolás; Higgins, Simon J.; Lambert, Colin J.; Anderson, Harry L.; Nichols, Richard J.Entity
UAM. Departamento de Física de la Materia Condensada; UAM. Centro de Investigación en Fisica de la Materia Condensada (IFIMAC); UAM. Instituto Universitario de Ciencia de Materiales Nicolás Cabrera (INC)Publisher
American Chemical SocietyDate
2018-09-12Citation
10.1021/jacs.8b06338
Journal of the American Chemical Society 140.40 (2018): 12877-12883
ISSN
0002-7863 (print); 1520-5126 (online)DOI
10.1021/jacs.8b06338Funded by
R.J.N., S.H., E.L. and A.H. acknowledge the UK Engineering and Physical Sciences Research Council (EPSRC) for the funding of this research under grant numbers EP/M014169/1, P/M029522/1 and EP/M005046/1. N.A., C.L., S.S. and I.G. acknowledge the European Commission (EC) FP7 ITN “MOLESCO” (project no. 606728) and the EPSRC (grant nos. EP/M014452/1 and EP/N017188/1). H.L.A. thanks the EPSRC (grants EP/N017188/1, EP/D076552/1 and EP/ M016110/1), UK National Mass Spectrometry Facility at Swansea University, for recording mass spectra. H.S. acknowledges the Leverhulme Trust for Leverhulme Early Career Fellowship no. ECF-2017-186. S.S. acknowledges the Leverhulme Trust for Leverhulme Early Career Fellowship no. ECF-2018-375. N.A. and G.R.B. acknowledge the Spanish MINECO (Grant MAT2014-57915-R, MAT2017-88693-R and MDM-2014-0377) and Comunidad de Madrid (Grant NANOFRONTMAG-CM, S2013/MIT-2850). N.A. and C.L. have received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 767187. IMDEA Nanociencia acknowledges support from the ’Severo Ochoa’ Programme for Centres of Excellence in R&D (MINECO, Grant SEV-2016-0686)Project
Gobierno de España. MAT2014-57915-R; Gobierno de España. MAT2017-88693-R; Gobierno de España. MDM-2014-0377; Comunidad de Madrid. S2013/MIT-2850/NANOFRONTMAG; Gobierno de España. SEV-2016-0686Editor's Version
https://doi.org/10.1021/jacs.8b06338Subjects
Molecular electronics; Increasing length; Porphyrin; Conductance; Length; FísicaRights
© 2018 American Chemical Society.Abstract
A key goal in molecular electronics has been to find molecules that facilitate efficient charge transport over long distances. Normally, molecular wires become less conductive with increasing length. Here, we report a series of fused porphyrin oligomers for which the conductance increases substantially with length by > 10-fold at a bias of 0.7 V. This exceptional behavior can be attributed to the rapid decrease of the HOMO-LUMO gap with the length of fused porphyrins. In contrast, for butadiyne-linked porphyrin oligomers with moderate inter-ring coupling, a normal conductance decrease with length is found for all bias voltages explored (±1 V), although the attenuation factor (β) decreases from ca. 2 nm-1 at low bias to <1 nm-1 at 0.9 V, highlighting that β is not an intrinsic molecular property. Further theoretical analysis using density functional theory underlines the role of intersite coupling and indicates that this large increase in conductance with length at increasing voltages can be generalized to other molecular oligomers.
Files in this item
Google Scholar:Leary, Edmund
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Limburg, Bart
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Alanazy, Asma
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Sangtarash, Sara
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Grace, Iain
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Swada, Katsutoshi
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Esdaile, Louisa J.
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Noori, Mohammed
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González, M. Teresa
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Rubio Bollinger, Gabino
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Sadeghi, Hatef
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Hodgson, Andrew
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Agrait de la Puente, Mario Nicolás
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Higgins, Simon J.
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Lambert, Colin J.
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Anderson, Harry L.
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Nichols, Richard J.
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