Effect of Solvent, Dye-Loading Time, and Dye Choice on the Performance of Dye-Sensitized Solar Cells

Figure 1

Absorbance by UV-Vis spectroscopy of 7, 10, and 20 μm thick titania films impregnated with N-749 dye dissolved in solvent mixtures by the N-749 Dip 2 (acetonitrile/t-butanol) and N-749 SCF (acetonitrile/t-butanol/sc-CO₂) Methods. The horizontal axis shows the total impregnation time for each sample. The N-749 SCF Method achieves absorbances comparable to those of the Dip Method using much shorter impregnation times.