TITLE

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

AUTHOR(S)
Liberatore, M.; Burtone, L.; Brown, T. M.; Reale, A.; Di Carlo, A.; Decker, F.; Caramori, S.; Bignozzi, C. A.
PUB. DATE
April 2009
SOURCE
Applied Physics Letters;4/27/2009, Vol. 94 Issue 17, p173113
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Dye solar cells with Co(III)/Co(II) redox mediators have been prepared. To obtain higher conversion efficiencies, the recombination between photoinjected electrons and Co(III) 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.
ACCESSION #
38712301

 

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