Fig. 3: Energy transfer and recombination dynamics for perovskite films and devices.

The original TA spectra located at a 360–540 nm and b 540–900 nm for a pristine FAPbI₃ perovskite film. TA spectra at selected timescales of the FAPbI₃ perovskite films c without and e with CdAc₂ additive. TA spectra at different wavelengths as a function of delay times of the FAPbI₃ films d without and f with CdAc₂ additive.