| 초록 |
Dye-sensitized solar cells have attracted much attention with their low production costs of electricity and relatively high energy-conversion efficiencies. Recently, nanocrystalline TiO2 powders have been used as a working electrode for DSSC due to a higher efficiency, lower cost. In order to maximize the cell efficiency of DSSC, the TiO2 material should have a high surface area where the dye can be sufficiently adsorbed.In this study, mesoporous spherical anatase TiO2 with high surface area were successfully prepared via in situ hydrolysis of titanium glycolate precursor spheres. The particlediameters of the prepared TiO2 spheres ranged from 3.3 to 11.4nm through annealing for different calcinations temperatures from 100oC to 700oC. An overall solar conversionefficiency of 6.3% was achieved using the mesoporous TiO2 spheres electrode which was annealed for 200oC and higher than the other electrodes. These different TiO2 photoanodes were also treated with a dilute solution of TiCl4 at room temperature. Significant improvement in the photocurrent was observed for all of the mesoporous TiO2electrodes. |
