Fig. 2: Mixed halide CsSnI3−xClx perovskite morphology, structure and elemental distribution.
From: Enhanced control of self-doping in halide perovskites for improved thermoelectric performance
a Schematic of the mixed halide perovskite deposition method. The white squares represent the CsSnCl3 structures in the top layers of the B-γ-CsSnI3 perovskite films. b–e SEM images of the morphological development of mixed halide perovskite films as a function of baking time. f High-resolution transmission electron microscopy (HRTEM) of mixed halide perovskite structures. The yellow square and red square correspond to CsSnCl3 and CsSnI3 crystal lattices, respectively. g STEM-HAADF image of isolated grains of mixed halide CsSnI3−xClx formed on an amorphous carbon support and (h–k) STEM-EDS elemental mapping in the area denoted by the red square in (g).
