Considering the organic cation, the general trend is that MA is much more stable than FA due to the individual stability of the organic cation alone. However, FAPbX3 devices have shown superior thermal stability in air and comparable sensitivity to moisture than those MA-based [39]. Controversially, Sn-based devices incorporating FA have shown poor stability in comparison to those MA-based, potentially a reflection of the relative stability of each A cation as FA has an inclination to form ammonia (NH3), sym-triazine (C3H3N3) and SnI6 [36] and [46].
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