The optical properties for non-MAPbBr3 device material layers can be found in Ref. [31]. absorptance with respect to the other material layers in the given device configuration. Figure shows the difference in optical absorptance between optimized and unoptimized MAPbBr3 active layer thickness PSC designs, PSC ΔA% = Optimized PSC A% -Unoptimized PSC A%, (Eq. 1)