Fig. 14
From: Ion exchange: an advanced synthetic method for complex nanoparticles

(Reprinted with permission from American Chemical Society [104])
a A schematic of the anion exchange within the cubic perovskite crystalline structure of CsPbY3. b Powder X-ray diffraction patterns of the initial CsPbBr3 and anion-exchanged samples. c, d Transmission electron microscopy images of ~ 10 nm CsPbX3 nanocrystals after treatment with various quantities of Cl− and I− anions