This PDF file includes:

• Perovskite preparation
• Solar cell characterization
• Fig. S1. Photovoltaic performance of CsFAMA solar cell.
• Fig. S2. High-resolution cross-sectional SEM image of the device.
• Fig. S3. Nano-FTIR of the intentionally degraded CsFAMA film at 100°C for 30 min.
• Fig. S4. High-resolution XRD pattern of the CsFAMA degraded perovskite sample deposited onto Si/Au substrate.
• Fig. S5. Comparison between intensity of the spectra collected at different regions of the FAMA film.
• Table S1. Film composition as obtained from Rietveld refinement using the software MAUD.

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