Fig. 1. The bandgap modulation of (F-PEA)2PbI4 PSCs via femtosecond laser shocking.
a Schematic of the laser-shock deformation process of (F-PEA)2PbI4 PSCs. b The relationship between laser energy density and maximum laser shocking pressure. c Tauc curves obtained from ultraviolet-visible absorption spectra reveal bandgap values variation with ultrafast pressure. d photoluminescence spectra under ultrafast pressure. e According to the Tauc curve, the bandgap decreases with ultrafast pressure, while the full-width at half-maximum (FWHM) of photoluminescence (PL) spectra is the opposite.