Binder-free electrophoretic deposition (EPD) and mechanical compression were employed to fabricate TiO 2 photoanodes for use in all-plastic substrate flexible dye-sensitized solar cells having a gel electrolyte. The photoanodes were composed of commercial 20 nm TiO 2 powders with and without the addition of 160 nm TiO 2 powders. The EPD was performed under different DC powers and deposition times to obtain photoanodes having different thicknesses. Depending on the thickness, various electron diffusion times, ranging from 8.08 to 12.40 ms, and electron lifetimes, ranging from 16.79 to 32.05 ms, were obtained for the photoanodes consisting of only commercial 20 nm TiO 2. The electron diffusion time was reduced and the electron lifetime remained the same as a result of the addition of another commercial 160 nm TiO 2 powder. The added 160 nm TiO 2 powders enhanced the light absorptance by serving as light scattering centers. All-plastic flexible dye-sensitized solar cells were made and evaluated. Compared to the 20 nm TiO 2 only cells, the cells containing mixed powders exhibit enhanced efficiencies and the enhancement can be as much as 22%.
All Science Journal Classification (ASJC) codes
- 化學 (全部)