Fig. 2. Overlay of the raw X-ray PDF data collected over a range of 300 K to T max for (a) MASnI3 (T max = 360 K), (b) FASnI3 (T max = 360 K), (c) MAPbI3 (T max = 360 K), and (d) FAPbI3 (T max = 480 K). Peak asymmetry of the first B–I correlation at approximately 3 Å is observed in all compositions, but is most pronounced in the Sn compositions.
