Fig. 1: Chemical structures, electrostatic potential and absorption spectra of materials.

a Chemical structures of PM6, D18-Cl, PTB7-Th, L8-BO, C5−16 and INMB-F, b Electrostatic potential of INMB-F, PM6, D18-Cl and PTB7-Th, c–e UV–vis absorption spectra of PM6, D18-Cl and PTB7-Th neat films fabricated with or without the presence of INMB-F.