Fig. 3: TA characterizations of the CsPbClBr2 nanocrystal films.

a–c TA spectra at different delay times for the samples of a D0P8, b D4P4, and c D8P0, respectively. d–f TA kinetics of n = 1, 2, 3, 4 and n ≥ 5 domains for the samples of d D0P8, e D4P4, and f D8P0, respectively. Solid lines are the fitting curves using exponential function.