期刊
APPLIED PHYSICS LETTERS
卷 94, 期 17, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3126051
关键词
aluminium compounds; cobalt; dyes; electrochemical impedance spectroscopy; electrolytes; solar cells
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.
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