fig7

Figure 7. (A) Comparison of chemical structure between fused ring acceptor and fully non-fused acceptors. Change of remaining absorption intensity at 64 h of irradiation (B) and stabilities of organic solar cells under continuous one-sun-equivalent irradiation (C) of IT-4F, HF-PCIC and PTIC, respectively. (D) Simulated molecular geometries obtained via density functional theory calculations for simplified structures of o-4TBC-2F and m-4TBC-2F. (E) Single-crystal structure and molecular packing model of A4T-16. These figures are reproduced with permission from the Nature Publishing Group^[59,83,84] and John Wiley and Sons^[85], respectively.