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. 2021 Apr 1;12:2023. doi: 10.1038/s41467-021-22193-1

Fig. 5. The crystallization kinetics analysis of FAPbI3 single crystals.

Fig. 5

a The solute consumption as a function of the growth time at 90 °C. The FAPbI3/GBL solution (CFAPbI3 = 0.75 g/mL): (1) only black crystals grow (red) or (2) yellow crystals also appear (green); The FAPbI3/(GBL + PPG) solution (CFAPbI3 = 0.75 g/ mL, CPPG = 0.05 g/mL) that only black crystals (blue) grow. The yellow needle-like crystals, marked by the white arrow in the photo, are δ-FAPbI3.