Fig. 2

(a) SEM image, (b) TEM image, (c) theoretical modeling of the morphological features, (d,e) optical reflectance and absorbance spectra, respectively, and (f) particle size distribution of the lead-free perovskite KCsSnI1.7Cl1.3.

(a) SEM image, (b) TEM image, (c) theoretical modeling of the morphological features, (d,e) optical reflectance and absorbance spectra, respectively, and (f) particle size distribution of the lead-free perovskite KCsSnI1.7Cl1.3.