Fig. 2
From: Progress and outlook of Sn–Pb mixed perovskite solar cells
Bandgap structure of Sn–Pb mixed perovskite. a The bandgap according to each site change in ABX3 perovskite composition [21, 45, 46]. b Bandgap trend of MASn1-xPbxI3 without SOC and with SOC, and the difference in bandgaps without SOC and with SOC,\({\Delta }_{\mathrm{SOC}}\). Reproduced with permission from [47], copyright American Chemical Society, 2015. c M-I-M tilting angle as a function of x in MASn1-xPbxI3. Crystal structures of x = 0.0 and 1.0. Reproduced with permission from [47], copyright American Chemical Society, 2015. d The bandgap bowing in MA(Pb1-xSnx)I3 and reduction in the bandgap of alloy compositions by the effect of strain on the band edge energies of pure compositions. Reproduced with permission from [48], copyright American Chemical Society, 2018