Abstract
A new polymer donor based on 3,3′-difluoro-2,2′-bithiophene (2F2T) and difluorobenzoxadiazole (ffBX), named 2F2T-ffBX, is designed and synthesized. The organic solar cell (OSC) based on 2F2T-ffBX donor and [6,6]-phenyl-C60-butyl acid methyl ester ([60]PCBM) acceptor exhibits a high efficiency of 7.3% with a high open-circuit voltage (Voc) of 1.03 V. When blended with perylenediimide-based acceptor (PDI6), the corresponding OSC shows a higher Voc of 1.19 V with a low energy loss of 0.50 eV but a much lower efficiency of 2.0%. The detailed analyses including charge generation, transport, recombination properties, and morphology were performed to understand the performance of corresponding devices.
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Acknowledgements
This work was supported by the Ministry of Science and Technology (2017YFA0206600, 2014CB643501), the National Natural Science Foundation of China (21875072, 21520102006, 91633301), and the Recruitment Program of Global Youth Experts of China.
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Zhang, R., Wang, J., Liu, X. et al. High open-circuit voltage organic solar cells enabled by a difluorobenzoxadiazole-based conjugated polymer donor. Sci. China Chem. 62, 829–836 (2019). https://doi.org/10.1007/s11426-018-9429-1
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DOI: https://doi.org/10.1007/s11426-018-9429-1