Abstract
Two D–A conjugated polymers containing benzo[1,2-b:4,5-b’] dithiophene (BDT), benzo[1,2-b:4,5-b’]difuran (BDF) donor units and 4,7-di(thiophen-2-yl)-5,6-bis(n-octyloxy)[2,1,3]benzoselenadiazole (DTBSe) acceptor unit, namely PBDTDTBSe and PBDFDTBSe have been synthesized by Stille coupling polymerization. The two polymers show good solubility in common organic solvents, good film forming properties, broad absorption (350–700 nm), low optical band gap (about 1.60 eV) and relatively high hole mobility [1.22 × 10−2 cm−2/(V.s)]. The devices based on the blend film of PBDFDTBSe and PC71BM (1:1, w/w) exhibited the best device performance with PCE of 3.28 %, V oc of 0.71 V, J sc of 10.37 mA cm−2 and FF of 44.6 % under illumination of AM 1.5 G (100 mW cm−2).
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This work was supported by the Open-End Fund for the Valuable and Precision Instruments of Central South University. The NMR data are characterized by Modern Analysis and testing Center of Central South University.
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W. Liu, L. Qiu and W. Tang contributed to this work equally.
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Liu, W., Qiu, L., Tang, W. et al. Synthesis and characterization of 5,6-bis(n-octyloxy)[2,1,3] selenadiazole-based polymers for photovoltaic applications. Polym. Bull. 73, 385–398 (2016). https://doi.org/10.1007/s00289-015-1493-2
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DOI: https://doi.org/10.1007/s00289-015-1493-2