Fig. 4
From: Progress and outlook of Sn–Pb mixed perovskite solar cells
Compositional and crystal structural improvement of Sn–Pb mixed perovskite for solar cells. a IPCE curves for MASnxPb(1-x)I3 PSCs and optimized photovoltaic performance for MASn0.5Pb0.5I3 and MAPbI3 PSCs. Energy diagram of MASnxPb(1-x)I3 perovskite. Reproduced with permission from [20], copyright American Chemical Society, 2014. b Schematic view of formation perovskite precursor and SEM images of (FASnI3)1-x(MAPbI3)x perovskite films. c Normalized PL spectra of (FASnI3)1-x(MAPbI3)x perovskites, TRPL of (FASnI3)1-x(MAPbI3)x perovskites at x = 0.0, 0.4, 1.0 and J-V curves at x = 0.4. Reproduced with permission from [15], copyright American Chemical Society, 2016