Fig. 3: Optical, electrochemical, and crystalline properties of the FNEAs.

a, b UV-vis-NIR absorption spectra of as-cast and 120 °C annealed films of the FNEAs. c Energy levels alignment diagram. d–g Corresponding 2D GIWAXS patterns. h, i The related 1D line-cut profiles. Source data are provided as a Source Data file.