fig6

Figure 6. (A)The schematic diagram of LI²ST (B) The TEM images and corresponding SAED patterns of HPs film in the light-on state and light-off state for 0, 60, and 120 min, respectively (C) HAADF-STEM images of the HP sample under different illumination times (0, 2, and 12 h) reveal the occurrence of intragrain nucleation and growth of PbBr₂ impurity clusters. (marked using white arrows). Reproduced with the permission of Ref.^[118] Copyright © 2023 American Chemical Society. TEM: Transmission electron microscopy; SAED: Selected area electron diffraction; HPs: Halide perovskites; HAADF-STEM: High angle angular dark field-scanning transmission electron microscopy.