Figure 10. (a) 2D GIWAXS patterns based on (a–c) PBDB-T, (d–f) ITIC, and (g–i) PBDB-T:ITIC processed with and without BP-BP doping. Reproduced from [125]. (j) Schematic diagram of working mechanism of bipy additive before and after hot annealing in J51:N2200 blending system. Reproduced from [126].