Dye solar cells with CoIII /CoII redox mediators have been prepared. To obtain higher conversion efficiencies, the recombination between photoinjected electrons and CoIII species was minimized by deposition of a thin Al2O3 blocking layer over the mesoporous TiO2 surface. Measurements of current-voltage characteristic curves, both under illumination and in dark conditions, together with electrochemical impedance spectroscopy demonstrate the great effectiveness of the addition of a blocking layer in cells containing cobalt based electrolyte, by substantially reducing the recombination current. The consequent power conversion efficiency increase is more than double, passing from 0.94% to 2.48% under 300 W m−2 AM 1.5 illumination.

On the effect of Al2O3 blocking layer on the performance of dye solar cells with cobalt based electrolytes

CARAMORI, Stefano;BIGNOZZI, Carlo Alberto
2009

Abstract

Dye solar cells with CoIII /CoII redox mediators have been prepared. To obtain higher conversion efficiencies, the recombination between photoinjected electrons and CoIII species was minimized by deposition of a thin Al2O3 blocking layer over the mesoporous TiO2 surface. Measurements of current-voltage characteristic curves, both under illumination and in dark conditions, together with electrochemical impedance spectroscopy demonstrate the great effectiveness of the addition of a blocking layer in cells containing cobalt based electrolyte, by substantially reducing the recombination current. The consequent power conversion efficiency increase is more than double, passing from 0.94% to 2.48% under 300 W m−2 AM 1.5 illumination.
2009
M., Liberatore; L., Burtone; T. M., Brown; A., Reale; A., Di Carlo; F., Decker; Caramori, Stefano; Bignozzi, Carlo Alberto
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1378961
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