“…Even though many SMDs have been studied theoretically for applying BHJ OSCs, there has been no report regarding IIG-containing SMDs. In this context, we have selected several electron-rich groups including benzo[1,2- b :4,5- b ′]dithiophene (BDT), − 4,8-dimethoxybenzo[1,2- b :4,5- b ′]dithiophene (DMBDT), dithieno[2,3- b :2′,3′- e ]pyridine (PyDT) , fluorene (Flu), , carbazole (Cbz), , dibenzo[ b , d ]silole (DBSi), cyclopenta[2,1- b :3,4- b ′]dithiophene (CPDT), , dithieno[3,2- b :2′,3′- d ]pyrrole (PDT), dithieno[3,2- b :2′,3′- d ]thiophene (TDT), − dithieno[3,2- b :2′,3′- d ]silole (SiDT), , indacenodithiophene (IDT), pyrroloindacenodithiophene (PIDT), and silaindacenodithiophene (SiIDT), , linked with electron-withdrawing isoindigo group to design a series of donor molecules for BHJ OSCs. The molecular design follows the D 2 –A–D 1 –A–D 2 and D 2 –A–π–D 1 –π–A–D 2 configurations.…”