ZnO로 후처리된 TiO2 광전극을 이용한 고효율의 염료감응형 태양전지의 개발

초록

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.

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