In this study, an efficient dye-sensitive solar cells (DSSC) was
developed after post-treatment of ZnO on TiO2 photoelectrode. The
TiO2 electrode with ZnO post treatment was prepared with Titanium
isoporopoxide in Zinc Nitrate Hexahydrate aqueous solution by
incineration for 30 min at 450℃. The ZnO-post treated TiO2 electrode
showed strong dispersion force between particles in relation to the
control TiO2, referring high specific surface area and dye-adsorption
rate. Proper addition of ZnO enhanced electron mobility and reduced
internal resistance and electron recombination. Light conversion
efficiency of DSSCs containing the ZnO-posttreated TiO2 electrode
increased 35.4% when compared to the DSSCs using TiO2 electrode.
It is similar to the DSSCs with TiCl4 post treatment TiO2 electrode.
Increasing of light conversion efficiency was due to high specific
surface area and dispersion force, and low dye-adsorption rate and
electron recombination. Taken together, ZnO may be used as
posttreatment of photoelectrode and replaced TiCl4 that has high
toxicity and causticity.