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Efficiency Improvement in Co-sensitized DSSCs Through a Cascade Band Alignment of N-719 and Rose Bengal Dyes on Nanostructured ZnO Photoanodes

Published online by Cambridge University Press:  26 January 2017

M.A. Borysiewicz ,
S. Chusnutdinow ,
M. Wzorek  and
T. Wojciechowski
M.A. Borysiewicz*
Affiliation:
Institute of Electron Technology, Al. Lotników 32/46, 02-668 Warsaw, Poland
S. Chusnutdinow
Affiliation:
Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
M. Wzorek
Affiliation:
Institute of Electron Technology, Al. Lotników 32/46, 02-668 Warsaw, Poland
T. Wojciechowski
Affiliation:
Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
*
*(Email: [email protected])
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Abstract

We show that by subsequent sensitization of nanostructured ZnO photoanodes with N-719 and Rose Bengal dyes an improvement or worsening of the cell efficiency may be obtained, relating to photoanodes sensitized with N-719 dye only (J SC = 2.97 mA/cm2, V OC = 0.68 V, η = 0.99%) depending on the order in which the dyes are applied. We observe that for the case when the N-719 dye is followed by Rose Bengal an increase in efficiency, short circuit current and open circuit voltage is observed (J SC = 3.95 mA/cm2, V OC = 0.71 V, η = 1.26%), which we relate to the cascade band alignment of the ZnO and the dyes. In the case when Rose Bengal is first on ZnO followed by N-719, a lowering of all parameters is observed (J SC = 2.86 mA/cm2, V OC = 0.64 V, η = 0.94%) due to the trap band alignment. Electrochemical impedance spectroscopy measurements and modelling confirmed this theory showing longer electron lifetimes in the photoanode for the cascade band alignment, enhancing electron-hole separation, than for the trap alignment, facilitating electron-hole recombination.

Keywords

photovoltaicoxidesputtering
Type
Articles
Information
MRS Advances , Volume 2 , Issue 14: Nanomaterials , 2017 , pp. 767 - 775
Copyright
Copyright © Materials Research Society 2017 

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References

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