Extended Data Fig. 1: Optical spectroscopy of mixed-cation films.
From: Performance-limiting nanoscale trap clusters at grain junctions in halide perovskites
a, b, PL spectra with 532-nm excitation of (a) (Cs0.05FA0.78MA0.17)Pb(I0.83Br0.17)3 and (b) (Cs0.05FA0.78MA0.17)PbI3 films. c, d, Photothermal deflection spectroscopy (PDS) of (c) (Cs0.05FA0.78MA0.17)Pb(I0.83Br0.17)3 and (d) (Cs0.05FA0.78MA0.17)PbI3 films, showing a negligible sub-bandgap absorption.
