(Left): Injection-dependent (negative) lifetime equivalent defect density ΔN_leq of the TR sample from Figure 3 at 1 h (compared to 0 h) and best matching SRH fit curves assuming different improvements in surface passivation quality given as (negative) Δj₀. The 4.0 fA/cm² curve corresponds to the minimal overall MSE (shown in the inset). The dashed line shows the contribution of the changed surface passivation quality to overall ΔN_leq. (Right): Results of the SRH parameter surface analysis showing the combinations of τ_n/τ_p and energy level E_def (relative to the intrinsic Fermi level E_i lying close to mid-gap) that result in the lowest mean square error for the ΔN_leq (Δn) data from Figure 5 (left) assuming different improvements in surface passivation quality given by (negative) Δj₀. The light blue 4.0 fA/cm² curve corresponds to the minimum overall MSE.