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

Figure 5

FETEM images of (a) the uncoated, (b) the uncoated/heated, (c) the SiO₂-coated films, and the films coated with (d) 10 mM, (e) 20 mM, and (f) 30 mM of the (C₂H₅O)₅Nb solutions [2, 3].

(a)

(b)

(c)

(d)

(e)

(f)