fig2

Figure 2. (A) The SAED patterns of CsPbBr₃ were captured at three different temperatures: at RT, at 90 °C, and at 133 °C, respectively; (B) TEM images show the morphology of the domain varies in situ as the temperature rises from RT to 133 °C, followed by cooling, and the corresponding SAED patterns. Reproduced with the permission of Ref.^[92] Copyright © 2020 American Chemical Society; (C) TEM images show the nucleation and growth processes of the 2MAI-3PbI₂-2DMF intermediate; (D) TEM images and corresponding SAED patterns show the phase transition process. Reproduced with the permission of Ref.^[96] Copyright © 2023 American Chemical Society; (E) DPC-STEM image of a single CsPbI₃ nanocrystal heated at 200 °C viewed from the [001] direction and the magnified images from the colored box, showing the phase transition dynamics. Reproduced with the permission of Ref.^[97] Copyright © 2023 Springer Nature. SAED: Selected area electron diffraction; RT: Room temperature; TEM: Transmission electron microscopy; DPC-STEM: Differential phase contrast-scaning transmission electron microscopy.