Figure 8

(a) Schematic illustration of fluorescence scanning confocal microscopy set-up for visualizations of the charge carrier diffusion in perovskite plates. (b) Schematic representation of the charge carrier excitation and probing the diffusion, and recombination processes. (c) Optical (the red spot indicates the laser excitation spot) and (d) PL intensity images of a CH₃NH₃PbI₃ plate (‘A’ indicates the position where the PL kinetics is probed with respect to time delay). Scale bar: 5 μm. (e) PL kinetics obtained from the position ‘A’ (blue squares). Solid green curve is PL decay collected from the entire plate, which was used to estimate the wave-guided component for subtraction. Red curve represents the net kinetics at position A after subtracting the wave-guided contribution. The inset shows the PL kinetics collected from excitation site. Reproduced from Tian et al.¹⁰⁰ (f) PL image and intensity line profiles of individual CsPbBr₃ NCs. (g) PL intensity fluctuation versus time for three typical single NCs marked in the part (f). Reproduced from Swarnkar et al.⁹⁶ (h) PL image of individual CH₃NH₃PbI₃ NCs. (i) PL intensity fluctuation of a typical CH₃NH₃PbI₃ NC vs time and (j) the positions of corresponding emission localization. Reproduced from Tian et al.⁹⁸