Side-chain manipulation on accepting units of two-dimensional benzo[1,2-:4,5-′]dithiophene polymers for organic photovoltaics

Two donor-acceptor alternating polymers of bis(octylthio)thienyl benzo[1,2- b :4,5- b ′]dithiophene (BDTTs) and fluorinated benzo[ c ][1,2,5]thiadiazole (fBT) or 5-dodecylthienyl-6-fluorobenzo[ c ][1,2,5]thiadiazole were designed for organic photovoltaic applications. The polymers displayed strong a...

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Published in:Polymer chemistry 2016-02, Vol.7 (7), p.1486-1493
Main Authors: Xu, Zhongsheng, Luo, Guoping, Yu, Jiangsheng, Yin, Xinxing, Zhu, Enwei, Zhang, Fujun, Wu, Hongbin, Tang, Weihua
Format: Article
Language:English
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Summary:Two donor-acceptor alternating polymers of bis(octylthio)thienyl benzo[1,2- b :4,5- b ′]dithiophene (BDTTs) and fluorinated benzo[ c ][1,2,5]thiadiazole (fBT) or 5-dodecylthienyl-6-fluorobenzo[ c ][1,2,5]thiadiazole were designed for organic photovoltaic applications. The polymers displayed strong absorptions in the range of 300-650 nm and bandgaps of ∼1.60 eV. Bulk-heterojunction solar cells of PBDTTs-fBT and (6,6)-phenyl C 71 -butyric acid methyl ester (PC 71 BM) blends exhibited a maximum power conversion efficiency of 6.27%. Experimental results and theoretical modelling were correlated to reveal the impact of substitution on fluorinated BT on the optoelectronic properties of the resulting polymers. Two donor-acceptor alternating polymers of bis(octylthio)thienyl BDT and fluorinated BT or 5-dodecylthienyl-6-fluorobenzo[ c ][1,2,5]thiadiazole were designed for organic photovoltaics.
ISSN:1759-9954
1759-9962
DOI:10.1039/c5py01632k