The degradation of CH₃NH₃PbI₃ powder and films following exposure to air and X-ray radiation was investigated using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy. Our findings revealed significant differences in the states of PbI₂ and PbO between the films and the powder, as indicated by the energy positions of the Pb 4f and C 1s peaks. Additionally, a reduction in both the mass and size of the crystals suggests ongoing degradation processes.
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