Fig. 5From: The Study of Metal Sulfide as Efficient Counter Electrodes on the Performances of CdS/CdSe/ZnS-co-sensitized Hierarchical TiO2 Sphere Quantum Dot Solar CellsSEM images of top view and cross section of a CuS and Cu2ZnSn(S1 − x Se x )4 with x = 0 (b), 0.5 (c), or 1.0 (d) counter electrodesBack to article page