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Charge transfer from an adsorbed ruthenium-based photosensitizer through an ultra-thin aluminium oxide layer and into a metallic substrate

Gibson, Andrew J.; Temperton, Robert H.; Handrup, Karsten; Weston, Matthew; Mayor, Louise Charlotte; O'Shea, James N.

Authors

Andrew J. Gibson

Robert H. Temperton

Karsten Handrup

Matthew Weston

Louise Charlotte Mayor

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JAMES O'SHEA J.OSHEA@NOTTINGHAM.AC.UK
Associate Professor and Reader Inphysics



Abstract

The interaction of the dye molecule N3 (cis-bis(isothiocyanato)bis(2,2-bipyridyl-4,4′-dicarbo-xylato)-ruthenium(II)) with the ultra-thin oxide layer on a AlNi(110) substrate, has been studied using synchrotron radiation based photoelectron spectroscopy, resonant photoemission spectroscopy, and near edge X-ray absorption fine structure spectroscopy. Calibrated X-ray absorption and valence band spectra of the monolayer and multilayer coverages reveal that charge transfer is possible from the molecule to the AlNi(110) substrate via tunnelling through the ultra-thin oxide layer and into the conduction band edge of the substrate. This charge transfer mechanism is possible from the LUMO+2 and 3 in the excited state but not from the LUMO, therefore enabling core-hole clock analysis, which gives an upper limit of 6.0 ± 2.5 fs for the transfer time. This indicates that ultra-thin oxide layers are a viable material for use in dye-sensitized solar cells, which may lead to reduced recombination effects and improved efficiencies of future devices.

Journal Article Type Article
Publication Date Jun 20, 2014
Journal Journal of Chemical Physics
Print ISSN 0021-9606
Electronic ISSN 1089-7690
Publisher AIP Publishing
Peer Reviewed Peer Reviewed
Volume 140
Issue 234708
Article Number 234708
APA6 Citation Gibson, A. J., Temperton, R. H., Handrup, K., Weston, M., Mayor, L. C., & O'Shea, J. N. (2014). Charge transfer from an adsorbed ruthenium-based photosensitizer through an ultra-thin aluminium oxide layer and into a metallic substrate. Journal of Chemical Physics, 140(234708), doi:10.1063/1.4882867
DOI https://doi.org/10.1063/1.4882867
Keywords charge transfer, surface photoemission, monolayers, multilayers, x-ray absorption
Publisher URL http://scitation.aip.org/content/aip/journal/jcp/140/23/10.1063/1.4882867
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information Copyright 2014 AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in The journal of chemical physics, v. 140 (234708) and may be found at http://scitation.aip.or...40/23/10.1063/1.4882867

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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