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31P NMR spectra of a) PPT and b) PPF and their mixtures with different perovskite precursor components. c) ESP map of PPT molecule. d) XPS spectra of Pb 4f signal for the pristine, PPT‐modified, and PPF‐modified perovskite films. e) Schematic illustration of the passivation function of PPT on a perovskite surface.
