Figure 1
From: Colloidal lead halide perovskite nanocrystals: synthesis, optical properties and applications

(a) Illustration of the perovskite crystal structure. Adapted from Christians et al.21 (b) Tuning of the dimensionality of inorganic perovskites by varying the organic ligands used. Reproduced from Sun et al.26 (c) Schematic representation of 3D and (quasi)-2D layered perovskite nanostructures. Reproduced from Wu et al.27