Phenoxy Group-Containing Asymmetric Non-Fullerene Acceptors Achieved Higher V_OC over 1.0 V through Alkoxy Side-Chain Engineering for Organic Solar Cells

Advancing Integration of Direct C–H Arylation-Derived Star-Shaped Oligomers as Second Acceptors for Ternary Organic Solar Cells

“…Bulk heterojunction (BHJ)-based organic solar cells (OSCs) have emerged as a promising option to convert solar light into electrical energy, which is becoming more important as fossil fuels continue to deplete energy reserves. − Important advantages of these OSCs include the insertion of nonfullerene acceptors (NFAs), mechanical qualities that are both lightweight and flexible, and the ability to fabricate the devices economically, as demonstrated by recent significant successes in OSCs with power conversion efficiencies (PCEs) close to 20%. − Improved morphological stability, a high absorption coefficient, and a customizable absorption range and energy levels are the new qualities offered by OSCs, which have recently advanced thanks to the breakthroughs in fused-ring acceptors (FRAs) like ITIC, Y6 and BTP-eC9, etc. − The PM6:Y6 binary BHJ OSCs with a medium bandgap donor (PM6) and a narrow bandgap acceptor (Y6) increases near-infrared absorption and photon collection and PCEs. ,− Regardless, Y6 still has a low open-circuit voltage ( V OC ) of about 0.82 V due to its deeply located lowest unoccupied molecular orbital (LUMO). Meanwhile, Y6 shows poor capture toward the photon between 600–700 nm wavelength band. , Typically, a single molecular design is hardly to simultaneously meet these two criteria, i.e.…”