Fig. 5: Sn perovskite degradation tests under dry/moist air/nitrogen flow.

Optical degradation of (PEA)_0.2(FA)_0.8SnI₃ films at 660 nm upon exposure to a flow of dry N₂ (RH = 0%), moist N₂ (RH = 90%), dry air (RH = 0%) and moist air (RH = 90%).