fig1
Figure 1. Structural and compositional analyzes of as-prepared perovskite films. (A) Crystalline structure of (3-TFMBA)2(Cs0.17FA0.83)n-1Pbn(I0.83Br0.17)3n-1I2 perovskite. (B) XRD patterns (peaks labeled with “#” are derived from FTO). (C) Top-view SEM image of quasi-2D perovskite film with n = 40. (D) Survey XPS spectra and (E-I) corresponding high-resolution XPS spectra at (E) Br 3d, (F) I 3d, (G) Pb 4f, (H) Cs 3d and (I) F 1s regions of quasi-2D perovskite films with different n values.
