Atomic-level understanding of a formamidinium hybrid halide perovskite, FAPbBr3 .
Herein, we show how electron microscopy can provide atomic-
level understanding of FAPbBr3, where electron diffraction and
high-resolution imaging were combined allowing not only the
characterization of the pristine material but also the identification
of different intermediates upon its structural disintegration. Addi-
tionally, a minor tetragonal phase was also identified whose struc-
ture was also solved.