Titania powder (P25) was dispersed by bead-milling breakdown method, and the dispersivity of TiO 2 was controlled by adjusting the mean secondary TiO 2 particle size to 45, 56, and 75nm by changing the dispersion solvent blend ratio of ethanol and terpineol. The transparency of the coated layer increased when the particle size of TiO 2 aggregates became smaller than 100nm. Although the transparency was significantly different according to differences in the size of nanocrystallyne-TiO 2 aggregates, the resulting photovoltaic (PV) effect of a dye-sensitized solar cell (DSSC) was not significantly different between the different aggregate sizes. A double layer structure (transparent TiO 2 layer/opaque TiO 2 layer) was adopted to improve the PV effect, which resulted in an improvement of the photocurrent and conversion efficiency of 13.2 and 11.1, respectively, from that for the DSSCs with single-layered TiO 2 electrodes.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)