Pechini based titanium sol as a matrix in TiO2 pastes for dye-sensitized solar cell application
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The influence that the degree of polyesterification has on a titanium sol (Ti-sol) prepared via the Pechini method that acts as a matrix in TiO2 pastes used for dye sensitized solar cells is reported. The different content of the polyester in the Ti-sol was realized by varying the heating time of the Ti-sol. Titanium dioxide pastes were prepared by introducing a commercial TiO2 nanopowder into the Ti-sols. The TiO2 layers were tested as photoanodes in dye-sensitized solar cells (DSSCs). The most appropriate degree of polyesterification was achieved by heating the Ti-sol for 0.5 and 1 h, while longer heating deteriorates the TiO2 layer morphology. The highest efficiency of the DSSCs based on an ionic liquid electrolyte was 6.3% measured under standard test conditions (100 mW/cm2, AM 1.5, 25 °C).
KeywordsTiO2 Dye-sensitized solar cell Pechini method Polyesterification
The authors would like to thank Dr. Peter Panjan for making thickness measurements. M. D. would personally like to acknowledge the CBS Institute and Public Agency for Technology of the Republic of Slovenia for providing her with Ph.D. funding. We are also grateful for the financial support given by the Slovenian Research Agency (P2-0197).
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