Fig. 3. Recombination dynamics for CF₃KO₃S treated quasi-2D films.

a Extracted defects density for different perovskite films according to SCLC measurements. b TRPL spectra for CF₃KO₃S-PEA and CF₃KO₃S-p-FPEA films under different excitation. c Film’s PLQYs as a function of carrier density for CF₃KO₃S-PEA and CF₃KO₃S-p-FPEA quasi-2D films, respectively. TA spectra at different delay time under carrier density of ~4 × 10¹⁸ cm⁻³ for d CF₃KO₃S-PEA and e CF₃KO₃S-p-FPEA films; the insets are the bleaching kinetics with different fluences. f Simulated carrier decay rates as a function of carrier density for CF₃KO₃S-PEA and CF₃KO₃S-p-FPEA films.