“…The APbX 3 Pb halide perovskites (HaPs), with A being a monovalent cation and X a halide anion, are attractive materials for inexpensive yet very efficient thin polycrystalline film solar cells, , light-emitting diodes, , and radiation , and particle detectors . However, doubts about the stability of the devices and even of the materials themselves overshadows their outstanding performance because, under certain conditions, HaPs degrade during exposure to intense radiation and humid conditions. , To date, most studies on stability have been done on complete devices with a multicomponent architecture, where it is likely that changes occur at interfaces and in the non-HaP parts of the devices . Therefore, it is challenging to extract the extent and kinetics of HaP material degradation by itself.…”