Source Data of Fig. 3, Fig. 4 and Fig. 5

Fig. 3: FTIR spectra comparison of poly 4a-c and 1a-c (Fig. 3b); Raman spectra of 1a-c (Fig. 3c); UV-Vis absorption of 1a-c in NMP solution (Fig. 3d); Concentration-dependent photoluminescence spectra of 1c (Fig. 3e); Correlation between the photoluminescence peak areas and concentration C (Fig. 3f)Fig. 4: Band structure and effective mass calculations of 1a-c (Fig. 4a); Time-dependent complex terahertz photoconductivity (Fig. 4b), Frequency-resolved complex terahertz conductivity response (Fig. 4c); The inferred charge transport parameters of 1a-c from THz spectroscopy based on the fitted lines (Fig. 4d)Fig. 5: Transport data for a field-effect transistor of 1c (Fig. 5b); Excited state energies measured from D1 and D2 (Fig. 5f); Phonon band structure of 1c and the corresponding DOS (Fig. 5g)