Anomalous rheological behavior in chemically modified TiO2 colloidal pastes prepared for flexible dye-sensitized solar cells

Weerasinghe, H, Franks, G, Du Plessis, J, Simon, G and Cheng, Y 2010, 'Anomalous rheological behavior in chemically modified TiO2 colloidal pastes prepared for flexible dye-sensitized solar cells', Journal of Materials Chemistry, vol. 20, no. 44, pp. 9954-9961.


Document type: Journal Article
Collection: Journal Articles

Title Anomalous rheological behavior in chemically modified TiO2 colloidal pastes prepared for flexible dye-sensitized solar cells
Author(s) Weerasinghe, H
Franks, G
Du Plessis, J
Simon, G
Cheng, Y
Year 2010
Journal name Journal of Materials Chemistry
Volume number 20
Issue number 44
Start page 9954
End page 9961
Total pages 8
Publisher Royal Society of Chemistry
Abstract Binder-free titania pastes with high viscosity were developed for the preparation of electrodes for dye-sensitized solar cells on plastic substrates. The rheological behaviour of the ethanol-based titania pastes with the addition of ammonia, hydrochloric acid and water was investigated. The change in the viscosity could be correlated with the measured zeta-potential of the colloidal titania pastes. A newly developed nano-scratch test was used to evaluate the mechanical strength or the inter-particle connectivity of the titania films prepared under different conditions. Improved inter-particle connectivity and solar cell performance were found for the pastes containing acid or water, but no such improvements were seen for the pastes containing ammonia. A maximum light-to-electrical energy conversion efficiency of 4.9% (under one sun - 100 mW cm-2) was obtained for the plastic-based dye-sensitized solar cells fabricated by the modified titania pastes.
Subject Physical Chemistry not elsewhere classified
Keyword(s) Low-Temperature
Compression Method
Hamaker Constants
High-Efficiency
Films
Water
Irradiation
Electrodes
Performance
Conversion
DOI - identifier 10.1039/c0jm02063j
Copyright notice © 2010 The Royal Society of Chemistry
ISSN 0959-9428
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