Fig. 4: Electrode-induced perovskite decomposition.

a In situ heating-XRD characterization of the FACs/Ag/ALD-Al2O3/CVD-parylene sample and the corresponding detailed PbI2, perovskite (PVSK), AgI pattern, respectively. b In situ heating-XRD characterization of the FACs/Bi/ALD-Al2O3/CVD-parylene sample and the corresponding detailed PbI2, PVSK pattern, respectively. c Dependence of peak intensity of PbI2 and PVSK on temperature. Source data are provided as a Source Data file.