Extended Data Fig. 3: Characterization of Sn-based perovskite films with various annealing times.
From: Additive treatment yields high-performance lead-free perovskite light-emitting diodes
a–c, PL spectra of FA0.9Cs0.1SnI3 perovskites without (a) or with PEAI (b), PEAI and VmB1 (c), as additives. The samples were prepared by annealing for different times. d–f, Contour plot of in-situ PL spectra of FA0.9Cs0.1SnI3 perovskites without (d) or with PEAI (e), PEAI and VmB1 (f), as additives. The measurements were carried out during the thermal annealing process. g–i, XRD data of FA0.9Cs0.1SnI3 perovskites without (g) or with PEAI (h), PEAI and VmB1 (i), as additives.
