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

Figure 8

The simplified equivalent circuit of the DSCs fabricated by device structure of FTO glass substrate/SnO₂/ZnO/dye/electrolyte/lightly platinized FTO glass substrate. is the series resistance which corresponds to the transport resistance of the transparent conduction oxide substrate. and are the charge recombination resistance at the triple junctions and the chemical capacitance, respectively. and are the charge transfer resistance at the Pt/electrolyte interfaces and the interfacial capacitance, respectively, and is the Nernst diffusion impedance of the redox species in the electrolyte medium.