Resolution:
## Figure 3.
Nyquist plots of CdS QDSSCs under dark condition and 1,000-W/m^{2 }illumination. (a) Nyquist plots of CdS QDSSCs in dark; the equivalent circuit of the QDSSC with the
representation of impedance at CE/electrolyte interface (subscript CE), QD-sensitized
TiO_{2}/electrolyte (subscript r) and series resistance (subscript s). The symbol R and CPE
denote the resistance and constant phase element, respectively. (b) Details of plots (a) at high frequencies. (c) Nyquist plots of the same cells under 1,000-W/m^{2} illumination. (d) Details of plots (c) at high frequencies. The solid lines are the fitted curves.
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