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Two new D-A alternating copolymers,PBDFFBT and PBDTFBT, featuring a fluorinated benzothiazole (BT) electron-acceptor unit and the electron-donor segments of benzo[1,2-b∶4,5-b]difumn (BDF) or benzo[1,2-b∶4,5-b]dithiophene (BDT), were prepared by a standard Stille cross-coupling reaction.