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In this paper, we demonstrated the successful synthesis of newly designed copolymers, C1 and C2, with donor-acceptor type structure. Both C1 and C2 copolymers contained 9,9-dioctylfluorene-2,7- bis(trimethyleneboronate) as one constructional unit to improve the solubility in common
organic solvents. The other constructional unit was 2,3-bis(5-bromothiophen-2-yl)acrylonitrile (DTDBAL) for C1, while 4,7-dibromobenzo[c][1,2,5]thiadiazole unit, 5,5′-dibromo-2,2'-bithiophene unit and N1,N1-bis(4-bromophenyl)-N4,N4-bis(4-(2-phenylpropan-2-yl)phenyl)benzene-1,4-diamine
are for C2. We fabricated photovoltaic devices based on the C1 and the C2 copolymers with Poly(3,4- ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) layer, PC70BM layer, TiOx layer, and aluminum (Al) electrode. The bulk heterojuntion photovoltaic devices using
these copolymers as electron donor and PC70BM as the acceptor exhibited good device performances when measured at 100 mW cm-2. The power conversion efficiency (PCE) of the C1 device reached 0.45% with Voc,Jsc, and FF of 0.51, 2.50
and 35%, respectively. The PCE of the C2 device reached 0.34% with V2oc,Jsc, and FF of 0.56, 2.01 and 30%, respectively.
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