Enhancing Performance of SnO₂-Based Dye-Sensitized Solar Cells Using ZnO Passivation Layer

Figure 7

Nyquist plots for the devices fabricated with (a) ZnO alone, (b) SnO₂/ZnO with electrolyte X and (c) ZnO alone, and (d) SnO₂/ZnO with electrolyte Y under dark and forward bias at −0.58 V.

(a)

(b)

(c)

(d)