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Additional file 1: Fig. S1. Solubility test images of P-IDI-SVS from different Soxhlet solvents of CB, CF, and THF at 80 °C without magnetic bars (donor only in CB solvent). Fig. S2. UV-vis absorption spectra of P-IDI-SVS (THF) with solution, film and annealed Film. Fig. S3. Cyclic voltammetry measurements of P-IDI-SVS. Table S1. Performance of different Soxhlet method of P-IDI–SVS:PC70BM (CB, CF, and THF) and BHJ devices processed from solutions with CB, CB–DIO3% and CB–CN3%. Table S2. Fitting parameter of TCSPC analysis with additive CN.