Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
We report a simple method to prepare bi-functional TiO2 disks (BF-TiO2) using an electrostatic spray technique, that are utilized for photoelectrodes of highly efficient dye-sensitized solar cells (DSSCs). This method has an advantage to remove the synthesis steps in conventional sol-gel method to form nano-sized TiO2 nanoclusters. The fine dispersion of commercially available nanocrystalline TiO2 particles (P25, Degussa) in EtOH without surfactants and additives is electro-sprayed directly onto a fluorine-dopoed tin-oxide (FTO) substrate for DSSC photoelectrodes. The DSSCs of BF-TiO2 photoelectrodes show high energy conversion efficiency over 7% under illumination of light at 100 mW cm-2, AM1.5 global. It is concluded from frequency-dependent measurements that the faster electron diffusion coefficient and longer lifetime of BF-TiO2 than those in nonstructured TiO2 contribute to the enhanced efficiency in DSSCs. The bi-functional TiO2 disks (BF-TiO2) were suggested as the most promising photoelectrodes for DSSCs due to the advantages of (1) large surface area and dye adsorption; (2) fast electron transport at reduced grain boundaries; (3) light scattering effects of the submicrometer sized structures; and (4) better penetration of electrolytes through the relatively large pores between disks.
Figure 1 SEM image of bi-functional TiO2 disks
(1) O뭃egan, B.; Gratzel, M. Nature 1991, 353, 737�740.
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