The origin of slow electron recombination processes in dye-sensitized solar cells with alumina barrier coatings

Fabregat-Santiago, F., Garcia Canadas, Jorge, Palomares, E., Clifford, J. N., Haque, S. A., Durrant, J. R., Garcia-Belmonte, G. and Bisquert, J. 2004. The origin of slow electron recombination processes in dye-sensitized solar cells with alumina barrier coatings. Journal of Applied Physics 96 (11) , pp. 6903-6907. 10.1063/1.1812588

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Abstract

We investigate the effect of a thin alumina coating of nanocrystalline TiO2 films on recombination dynamics of dye-sensitized solar cells. Both coated and uncoated cells were measured by a combination of techniques: transient absorption spectroscopy, electrochemical impedance spectroscopy, and open-circuit voltage decay. It is found that the alumina barrier reduces the recombination of photoinjected electrons to both dye cations and the oxidized redox couple. It is proposed that this observed retardation can be attributed primarily to two effects: almost complete passivation of surface trap states in TiO2 that are able to inject electrons to acceptor species, and slowing down by a factor of 3–4 the rate of interfacial charge transfer from conduction-band states.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords:	titanium compounds, alumina, nanostructured materials, semiconductor materials, thin films, solar cells, ion recombination, dyes, charge exchange, charge transfer states, charge injection, electrochemical impedance spectroscopy, time resolved spectra
Additional Information:	Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0021-8979/ (accessed 21/02/2014).
Publisher:	American Institute of Physics
ISSN:	0021-8979
Date of First Compliant Deposit:	30 March 2016
Last Modified:	23 May 2023 20:48
URI:	https://orca.cardiff.ac.uk/id/eprint/48406

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