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Time evolution of the PL spectra of Csy(FA0.66MA0.34)1–yPb(I0.67Br0.33)3 perovskite-based p–i–n solar cells illuminated for ∼28 h using 530 nm illumination at ∼1 sun equiv intensity for y = 0 (a) and y = 0.10 (b). The other panels shown as function of time: (c) spectral centroid. (d) PL intensity at ∼1.60 eV. (e) PL intensity at ∼1.74 eV. (f) Normalized Voc. (g) Normalized Jsc. (h) Normalized power-conversion efficiency (η). Voc, Jsc, and η are extracted from reverse J–V sweeps.
