| 초록 |
Dye-sensitized solar cells (DSSCs) have been widely attracted due to low manufacturing cost, environmental friendliness, and high efficiency. However, there are still several drawbacks to attain the conversion efficiency above 15 % for the commercialization. In particular, in the photoanode comprised of TiO2 nanoparticles, the trap-limited diffusion process leads to the high charge recombination with a reduction of electron collection efficiency, even though it shows large surface area ensuring a high dye loading for light harvesting. One-dimensional TiO2 nanotube (TONT) by electrochemical two-step anodization in 0.25 wt% NH4F of ethylene glycol was suggested to overcome this problem. Herein, the overcoating of TiO2 nanoparticle was introduced to support the surface area. |
