| 초록 |
The electrode in DSSCs demands high porosity and surface area so that the sensitizers can be sufficiently adsorbed and the paths for electron transport can be electronically interconnected. Highly ordered hierarchical mesoporous TiO2 networks can provide fast electron transport paths, and ordered mesopores can enhance light scattering, facilitate infiltration of the electrolyte, and ultimately increase the power conversion efficiency. In this work, we investigated the formation of hierarchical mesoporous TiO2 opal and inverse opal nanostructures and their application as photoanode in DSSCs. Those structures were fabricated using polystyrene beads and amphiphilic triblock copolymer (P123) as templates coupled with sol-gel infiltration method. Mesoporous carbon-TiO2 opal and inverse opal structures were also fabricated via sequential UV-stabilization and calcination of P123 containing TiO2 precursor solutions and their performance as electrode was compared with carbon-free analogues. |
