Quenching process effects on the performance of a TiO2 photoelectrode for dye-sensitized solar cells
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A rapid cooling (quenching) step has been introduced in fabrication of TiO2 photoelectrodes for dye-sensitized solar cells(DSSCs). The quenching process, studied at a fixed sintering temperature, decreased particle size but increased surfaceroughness without any substantial change in the crystal structure or oxidation state of TiO2 films. Therefore, the change inthe DSSC performance induced by the quenching was related closely to the microstructural and morphological changes in theTiO2 films. Smaller particle size and the rough surface of TiO2 films facilitated dye adsorption and increased the number ofactive reaction sites. In particular, the enlarged number of active reaction sites produced by the quenching process promotedthe charge transfer reaction at the TiO2-dye-electrolyte interface, resulting in overall performance improvement of DSSCs. Theconversion efficiency of the furnace cooled- and quenched-TiO2 films at 500 oC were 4.588% and 5.797%, respectively.
Abstract
A rapid cooling (quenching) step has been introduced in fabrication of TiO2 photoelectrodes for dye-sensitized solar cells(DSSCs). The quenching process, studied at a fixed sintering temperature, decreased particle size but increased surfaceroughness without any substantial change in the crystal structure or oxidation state of TiO2 films. Therefore, the change inthe DSSC performance induced by the quenching was related closely to the microstructural and morphological changes in theTiO2 films. Smaller particle size and the rough surface of TiO2 films facilitated dye adsorption and increased the number ofactive reaction sites. In particular, the enlarged number of active reaction sites produced by the quenching process promotedthe charge transfer reaction at the TiO2-dye-electrolyte interface, resulting in overall performance improvement of DSSCs. Theconversion efficiency of the furnace cooled- and quenched-TiO2 films at 500 oC were 4.588% and 5.797%, respectively.
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