Fig. 2: Interactions between the additives and perovskite precursors.
From: Manipulating crystallization dynamics through chelating molecules for bright perovskite emitters
a, b 1H NMR of FAI, FAI:m-PEG2–NH2 (1:0.2) and FAI:NH2–PEG4–NH2 (1:0.1) (a) and PbI2:FAI (1:2), PbI2:FAI:m-PEG2–NH2 (1:2:0.4) and PbI2:FAI:NH2–PEG4–NH2 (1:2:0.2) (b). Peaks a and b are signals of H (a) and H (b) as labeled in the chemical structure of FA+ in the inset. c BH plots extracted from the traces of PbI3− absorption (370 nm) with increasing FAI content in PbI2:NH2–PEG4–NH2 and PbI2:m-PEG2–NH2 parental solutions (Supplementary Fig. 16). d Ultraviolet–visible (UV–vis) absorption of neat PbI2 film, PbI2:m-PEG2–NH2 (1:0.4), and PbI2:NH2–PEG4–NH2 (1:0.2) films. All the stoichiometric ratios here are mole ratios.
