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

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Valencià Castellano

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

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Fabregat-Santiago, Francisco; Palomares Gil, Emilio; Clifford, John N.; Haque, Saif A.; Durrant, James R.; García Belmonte, Germà; Bisquert, Juan; García-Cañadas, Jorge

Aquest document és un/a article, creat/da en: 2004

Este documento está disponible también en : http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=JAPIAU000096000011006903000001&idtype=cvips&prog=normal&doi=10.1063/1.1812588

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.

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