Extended Data Fig. 5: Variation in perovskite precipitation behaviour depending on the ABr:PbBr2 ratio of the precursor solution.
From: Cold-injection synthesis of highly emissive perovskite nanocrystals
Precursor solutions with varying ABr:PbBr2 ratios were injected into toluene, showing distinct precipitation behaviours. At low ABr:PbBr2 ratio (≤1), large-sized perovskites with an orange coloration formed, whereas PeNC formation was gradually suppressed at ratios above 1.5. Given that DMF, the polar solvent used for the precursor solution, and toluene, the nonpolar solvent, are miscible and that no ligands were included, it can be inferred that an excess A-site cations isolated the plumbates, thus preventing their assembly.
