Fig. 2: Bandgap distribution of six gradient printing sequences of perovskite-inspired materials.

Compositions that lead to mixed phases are labeled in gray zones. N is the number of data points collected from hyperspectral imaging for one sequence. a Sequence (Cs3Br2I9)1-x (Cs3Bi2Br9)x. b Sequence (Cs3Sb2Br9)1-x (Cs3Sb2I9)x. c Sequence (Cs3Bi2I9)1-x (Cs3Sb2I9)x. d Sequence (Cs3Sb2Br9)1-x (Cs3Bi2Br9)x. e Sequence (Cs3Sb2I9)1-x (Cs3Bi2Br9)x. f Sequence (Cs3Sb2Br9)1-x (Cs3Bi2I9)x.