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Effects of TiO2 Blocking Layer on Photovoltaic Characteristics of TiO2/Nb2O5 Dye Sensitized Solar Cells

Published online by Cambridge University Press:  20 January 2020

Brian O. Owino ,
Francis W. Nyongesa ,
Alex A. Ogacho ,
Bernard O. Aduda  and
Benjamin V. Odari
Brian O. Owino*
Affiliation:
Department of Physics, University of Nairobi, P.O Box 30197-00100 Nairobi, Kenya
Francis W. Nyongesa
Affiliation:
Department of Physics, University of Nairobi, P.O Box 30197-00100 Nairobi, Kenya
Alex A. Ogacho
Affiliation:
Department of Physics, University of Nairobi, P.O Box 30197-00100 Nairobi, Kenya
Bernard O. Aduda
Affiliation:
Department of Physics, University of Nairobi, P.O Box 30197-00100 Nairobi, Kenya
Benjamin V. Odari
Affiliation:
Department of Physics, Masinde Muliro University of Science and Technology, P.O Box 190-50100 Kakamega, Kenya
*
*(Email: [email protected])
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Abstract

This study reports on the effect of introducing TiO2 compact layer on the photovoltaic characteristics of TiO2/Nb2O5 composite dye sensitized solar cell. The compact layer was deposited by spray pyrolysis technique. It was observed that introduction of 60 nm thick compact layer improved the short circuit current density Jsc ,Open circuit voltage Voc, and efficiency of the cell from 4.9 mA/cm2 to 8.2 mA/cm2, 6.8×10-1 V to 7.2×10-1 V and 1.9 % to 3.4 % respectively compared to traditional cell prepared without compact layer. Electrochemical impedance spectroscopy confirmed an increase in recombination resistance from 5.5×101 Ω.cm2 for bare DSSC to 9.0×101 Ω.cm2 for DSSC with compact layer thereby improving electron lifetime of the cells from 2.5×10-4 s to 386.9×10-4 s.

Keywords

compositeoptical propertiesphotovoltaicspray pyrolysisthin film
Type
Articles
Information
MRS Advances , Volume 5 , Issue 20: African Materials Research Society 2019 , 2020 , pp. 1049 - 1058
Copyright
Copyright © Materials Research Society 2020

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References

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