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Two conjugated copolymer donors, PTTABDT and PBTTABDT, based on a fused‐ring azepinedione acceptor unit, 5‐(2‐octyldodecyl)‐4H‐thieno[2′,3′:4,5]thieno[3,2‐c]thieno[2′,3′:4,5]thieno[2,3‐e]azepine‐4,6(5H)‐dione (TTA), are prepared. PTTABDT possesses a conventional donor–acceptor (D–A) structure with one TTA in the repeat unit, while PBTTABDT has a D–A–A structure with two TTAs in the repeat unit. Compared...
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