“…Chen and coworkers conducted a detail in situ GIWAXS analysis to investigate the effect of spin coating, solvent, and additive effect on the film morphology/order evolution. [ 33 ] This study is based on three‐model OSC systems, polymer donor P3HT and poly [[4,8‐bis[(2‐ethylhexyl)oxy]benzo[1,2‐b:4,5‐b′]dithiophene‐2,6‐diyl][3‐fluoro‐2‐[(2‐ethylhexyl)carbonyl]thieno[3,4‐b]thiophenediyl]] (PTB7), and small‐molecule donor 7,7′‐[4,4‐bis(2‐ethylhexyl)‐4 H ‐silolo[3,2‐ b :4,5‐ b ′]dithiophene‐2,6‐diyl]bis[6‐fluoro‐4‐(5′‐hexyl‐[2,2′‐bithiophen]‐5‐yl)benzo[ c ][1,2,5]thiadiazole] ( p ‐DTS(FBTTh 2 ) 2 ). CF, CB and 1,2‐DCB solvents, and 1‐chloronaphthalene (CN), diphenyl ether, DIO, and 1,6‐diiodohexane additives were used.…”