Light IV curves for the first two generations of IMM4J solar cells in BOL condition (solid green). The light IV curve for the last generation of IMM3J in BOL condition is shown for comparison (solid blue). The simulated realistic potential IV curves for both devices are shown as dashed lines. IV curves of the best cells after 1 MeV electron irradiation with a fluence of 1 × 10¹⁴ e^–/cm² and 2.5 × 10¹⁴ e^–/cm² are shown in solid pink and red respectively.