Where, ω denotes the frequency, τ (in logarithmic scale) represents the relaxation frequency, ε ∞ is the permittivity in the high-frequency limit, and ∆ε is the height of the relaxation step. The exponents α and β quantify the deviation from Debye behavior. For Y7, the fitted parameters are β = 1 and α = 1.2, with τ at 10.6 Hz, suggesting that the dielectric relaxation follows a symmetric Debye function. In contrast, for the blend, β = 1.2 and α = 1.6, with τ at 10.9 Hz, indicating that the dielectric relaxation follows an asymmetric Debye function [see Figure for the Cole-Cole plot]. The observed shift in the relaxation frequency suggests that in the blend, the Y7 domain length was shortened compared to that of the pristine film . These results are consistent with the GIWAXS, which also showed a shorter CL for the blend compared to the pristine Y7 film.