Fig. 4 | Nature Communications

Fig. 4

From: Unveiling the operation mechanism of layered perovskite solar cells

Fig. 4

High-resolution transmission electron microscope (HRTEM) images of cross-section of the spin-coated BA2MA3Pb4I13 thin films. a–c TEM images of the cross-section of the thin film at different locations and different magnifications. Inset: images of the fast-Fourier transforms (FFT) of the area in yellow square. d Statistical distribution of the angle θ between substrate and layered perovskites

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