Effective Sol-Gel Nanocoatings on ZnO Electrodes for Suppressing Recombination in Dye-Sensitized Solar Cells

Figure 2

FESEM images of (a) the uncoated ZnO, (b) the SiO₂-coated ZnO, and (c) the Nb₂O₅ (10 mM)-coated ZnO film [2–4].

(a)

(b)

(c)