Preparation of nanocrystalline TiO2 electrodes for flexible dye-sensitized solar cells: influence of mechanical compression
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Other documents of the author: Senthilarasu, S.; Peiris, T. A. Nirmal; Wijayantha, K. G. U.
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Title
Preparation of nanocrystalline TiO2 electrodes for flexible dye-sensitized solar cells: influence of mechanical compressionDate
2012Publisher
American Chemical SocietyISSN
1932-7447; 1932-7455Type
info:eu-repo/semantics/articlePublisher version
http://pubs.acs.org/doi/abs/10.1021/jp301638pAbstract
Nanocrystalline TiO2 electrodes were prepared using binder-free TiO2 paste on conductive ITO-PEN substrates
by the doctor-blade method at significantly low temperature (140 °C), and the electrodes were further processed ... [+]
Nanocrystalline TiO2 electrodes were prepared using binder-free TiO2 paste on conductive ITO-PEN substrates
by the doctor-blade method at significantly low temperature (140 °C), and the electrodes were further processed under different
compressions (10−60 MPa) in order to improve interparticle connections and adhesion between the nanoparticles and the ITOPEN
substrate. TiO2 electrodes compressed at 30 and 40 MPa had relatively less cracks with low crack width. Electrode
compressed at 30 MPa showed the highest internal surface area. Electrode prepared at this compression showed the best dyesensitized
solar cell (DSC) performance with Voc of 805 mV, Jsc of 9.24 mA cm−2
, and an overall efficiency of 4.39%.
Electrochemical impedance spectroscopy (EIS) studies of the sandwiched cells employing bare nanocrystalline TiO2 electrode
and Pt counter electrode in I−/I3
− electrolyte showed that electrode compression significantly influences the stability of the cells.
EIS data suggested that degradation/corrosion processes may take place on ITO-PEN for sandwiched cells made by TiO2
electrodes compressed at all pressures. Thirty and 40 MPa compressions showed a minor degradation of ITO. The
recombination dynamics at the TiO2/electrolyte interface were influenced by the changes in the nanostructured electrode
internal surface area, changes in electron transport properties (due to improved sintering), and possible degradation/corrosion of
ITO-PEN. Open-circuit voltage decay (OCVD) measurements showed that the DSC made by the 30 MPa compressed TiO2
electrode had the highest decay time, indicating low recombination properties, which is in a good agreement with other data. [-]
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J. Phys. Chem. C, 2012, 116 (36), pp 19053–19061Rights
Copyright © 2012 American Chemical Society
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