Particle Size Effects of TiO₂ Layers on the Solar Efficiency of Dye-Sensitized Solar Cells

Figure 4

The cross section FESEM images of double TiO₂ layers with (a) 400 nm/5 nm/FTO, (b) 400 nm/100 nm/FTO, (c) 400 nm/200 nm/FTO, (d) 100 nm/10 nm/FTO, (e) 200 nm/10 nm/FTO, and (f) 400 nm/10 nm/FTO.

(a)

(b)

(c)

(d)

(e)

(f)