Fig. 2: Characteristics of FAPbBr3 and choice of optical pulses.

a, Incident photon to converted electron (IPCE) spectrum of an FAPbBr3 device (blue), along with the spectrum of the visible electronic excitation pulse (red shaded) employed in this work. b, IR absorption spectrum of FAPbBr3 (blue), overlaid on the spectrum of the IR pre-excitation pulse (red) employed in this experiment.