Fig. 2: Interface ferroelectricity-driven ordering crystal structure.
From: Interfacial ferroelectricity unlocks stable formamidinium-based perovskites
a 1H and 207Pb spectra of FACs- and IF-FACs- based samples. b FTIR spectra for FACs- and IF-FACs- based samples. Wavelet transformations-EXAFS images of (c) FACs and d IF-FACs. e Schematic illustration of the effect of interfacial ferroelectricity on the crystal structure of FAPbI3 perovskite and the energy barrier of the transition of Pb-I octahedral configuration from corner-sharing to face-sharing.
