Fig. 2

CsPbBr₃ NC lattice response following moderate photoexcitation. a TR-XRD pattern of CsPbBr₃ NCs at various times following excitation at 4.8 mJ cm⁻² along with the static XRD pattern for reference on peak positions (black). The orthorhombic peaks are delineated with gray solid lines and the high-symmetry black dashed. A solid black line also denotes ΔS = 0 and arrows emphasize how the TR-XRD pattern evolves in time. b Zoomed in TR-XRD for 80 ps in the Q range of 1.6–2.1 Å⁻¹. Once again, the static pattern is displayed with the same features marked as in a. Arrows emphasize how the TR-XRD pattern deviates from the static XRD. c TR-XRD pattern for the [200] peak normalized such that the maximum ΔS = 1. The arrow denotes how the pattern evolves in time