Fig. 7From: The Study of Metal Sulfide as Efficient Counter Electrodes on the Performances of CdS/CdSe/ZnS-co-sensitized Hierarchical TiO2 Sphere Quantum Dot Solar CellsImpedance spectra of the assembled QDSSCs having the HTS photoanodes on the Pt (a), CuS (b), and Cu2ZnSn(S1 − x Se x )4 with x = 0 (c), 0.5 (d), or 1.0 (e) counter electrodesBack to article page