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

Gibson, Andrew J. and Temperton, Robert H. and Handrup, Karsten and Weston, Matthew and Mayor, Louise Charlotte and O'Shea, James 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). 234708/1-234708/7. ISSN 1089-7690

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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.

Item Type: Article
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.org/content/aip/journal/jcp/140/23/10.1063/1.4882867
Keywords: charge transfer, surface photoemission, monolayers, multilayers, x-ray absorption
Schools/Departments: University of Nottingham UK Campus > Faculty of Science > School of Physics and Astronomy
Identification Number: https://doi.org/10.1063/1.4882867
Depositing User: Eprints, Support
Date Deposited: 16 Feb 2016 08:42
Last Modified: 14 Sep 2016 09:05
URI: http://eprints.nottingham.ac.uk/id/eprint/31729

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