Fig. 10. (a) PCE of MA1−xFAxSn0.5Pb0.5I3 PSCs. UE in relation to the changing perovskite composition for (b) MA1−xFAxPb0.4Sn0.6I3 and (c) (FASnI3)x(MAPbI3)1−x. (d–f) Thermal and air stability test conducted on the device at 85 °C with 10% Cs addition. Stability and efficiency increase with the inclusion of Cs in SnxPb1−x PSCs. (b and c) Ref. 143. (d–f) Ref. 144.
