Abstract
Through different routes, A-D1-A-D2-type regioregular polymer P1 (via two steps method) and random polymer PR1 (via one step of Stille polymerization) with the similar polymer backbone, incorporating one acceptor unit (dialkyloxy-benzothiadiazole (ROBT)) and two different donor units (thieno[3,2-b]thiophene (TT) and terthiophene (3 T)) in the polymers, have been synthesized. Both TT and 3 T units could cause extended π-orbital conjugation and induce strong π–π stacking properties. Besides, the noncovalent S⋯O coulombic interactions between ROBT and oligothiophenes (TT and 3 T) intrachain ensured good planarity. Compared with the regioregular polymer P1, the random polymer PR1 showed higher power conversion efficiency of 3.40% because of its higher hole mobility and improved short-circuit current. Our results suggest that the random polymer is benefited to improving the photovoltaic performances, and it is significant to further understand the design conjugated polymers backbone of PSCs.
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