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In this study, we synthesized three new polymers,  P1–P3 , incorporating electron-donating 6,12-dihydro-6,6,12,12-tetraoctyl-indeno[1,2-b]fluorene (IF) and structural isomers of weak and strong electron-accepting 2,5-dioctyl-4,6-di(thiophen-2-yl)pyrrolo[3,4-c]pyrrole-1,3(2H,5H)-dione (IFPPD) or 2,5-bis(2-ethylhexyl)-3,6-di(thiophen-2-yl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione (LFPPD), or both the IFPPD and LFPPD units to study the performance of IF-based polymers on non-fullerene acceptor-based organic solar cells (NFA-OSCs). Polymer  P1  exhibited absorption from 300 nm to 450 nm with an optical bandgap ( E g) of 2.39 eV, whereas  P2  and  P3  showed extended absorption up to 700 nm with an  E gof 1.76 eV. The determined highest occupied molecular orbital/lowest occupied molecular orbital (HOMO/LUMO) levels for  P1–P3  were −5.54 eV/–3.15 eV, −5.40 eV/–3.64 eV, and −5.42 eV/–3.66 eV, respectively. The NFA-OSCs fabricated using  P1–P3  as the electron donor and Y6 as the electron acceptor exhibited a maximum power conversion efficiency ( PCE ) of 0.8%. We also utilized  P1–P3  as a co-adsorber and fabricated ternary NFA-OSCs using  P1–P3 :PM6:Y6 blends. The performance of the ternary devices was lower than that of binary devices made from the PM6:Y6 blend. Herein, we report the preparation of IF-based polymers containing pyrrolopyrroledione derivatives for binary and ternary NFA-OSC applications.

Dihydroindenofluorene–based polymeric donors incorporating structural isomers of pyrrolopyrroledione for non-fullerene organic solar cells