Influence of the Porosity of the TiO₂ Film on the Performance of the Perovskite Solar Cell

Figure 2

Plane-view SEM images of (a) PS-0, (b) PS-0.5, (c) PS-1.0, and (d) PS-1.5. Cross-sectional SEM images under high magnification of (e) PS-0 and (f) PS-1.0.

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