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A series of novel low band gap donor-acceptor(D-A) type organic co-polymers(BT-F-TPA, BT-CZ-TPA and BTSI-TPA) consisting of electron-deficient acceptor blocks both in main chains(M1)and at the pendant(M2) were polymerized with different electron rich donor(M3-M5) blocks,i.e., 9,9-dihexyl-9H-fluorene,N-alkyl-2,7-carbazole, and 2,6-dithinosilole, respectively, via Suzuki method. These polymers exhibited relatively low band gaps(1.65-1.88 e V) and broad absorption ranges(680-740 nm). Bulk heterojunction(BHJ) solar cells incorporating these polymers as electron donors, blended with [6,6]-phenyl-C61-butyric acid methyl ester(PC61BM) or [6,6]-phenyl-C71-butyric acid methyl ester(PC71BM) as electronacceptors in different weight ratios were fabricated and tested under 100 m W/cm2 of AM 1.5 with white-light illumination. The photovoltaic device containing donor BT-SI-TPA and acceptor PC71 BM in 1:2 weight ratio showed the best power conversion efficiency(PCE) value of 1.88%, with open circuit voltage(Voc) = 0.75 V, short circuit current density(Jsc) = 7.60 m A/cm2, and fill factor(FF) = 33.0%.
A series of novel low band gap donor-acceptor (DA) type organic co-polymers (BT-F-TPA, BT- CZ- TPA and BTSI- TPA) consisting of electron-deficient acceptor blocks both in the main chains at the pendant (M2) were polymerized with different electron rich donors (M3-M5) blocks, ie, 9,9- dihexyl-9H- fluorene, N-alkyl- 2,7- carbazole, and 2,6- dithinosilole, respectively , via Suzuki method. These polymers exhibit relatively low band gaps (1.65-1.88 eV) and broad absorption ranges (680-740 nm). Bulk heterojunction (BHJ) solar cells incorporating these polymers as electron donors, blended with [6,6 ] -phenyl-C61-butyric acid methyl ester (PC61BM) or [6,6] -phenyl-C71-butyric acid methyl ester (PC71BM) as electronacceptors in different weight ratios were fabricated and tested under 100 mW / cm2 of AM 1.5 with white-light illumination. The photovoltaic device containing donor BT-SI-TPA and acceptor PC71 BM in 1: 2 weight ratio showed the best power conversion efficiency (PCE) value of 1.88% with open circuit v oltage (Voc) = 0.75 V, short circuit current density (Jsc) = 7.60 m A / cm2, and fill factor (FF) = 33.0%.