| 초록 |
Recently, dye-sensitized solar cell (DSC) has drawn great attention with augment of oil price and shortage of global energy. It has been reported that the highest solar energy conversion efficiency so far achieved in DCS is ~11%, and the further improvement of efficiency is necessary for the competition to silicon solar cell. TiO2 has been accepted as the most suitable electrode material for the DSC with its unique properties. It retains an adequate band-gap with a unique position of flat-band potential, and a high adsorption affinity toward the carboxylate-terminated organics. Moreover, the electrons injected to the conduction band of TiO2 have an ultra-high mobility, which expedite the fast electron transfer with litte back-transport or recombination. The controlling of nanoporous TiO2 structure is one of the key issues in achieving the highly efficient DSC, since the TiO2 structure determines the loaded amount of dye molecules, the electron transfer via its conduction band, and the electrolyte diffusion through the generated pore structure. Herein we reviewed the design of TiO2 electrode for DSC, and suggest a possible solution to breakthrough the conversion efficiency so far achieved. We also introduce our recent research work in tailoring the nanostructure of TiO2 electrode. |
