4.7 Article

High open-circuit voltage organic solar cells enabled by a difluorobenzoxadiazole-based conjugated polymer donor

Journal

SCIENCE CHINA-CHEMISTRY
Volume 62, Issue 7, Pages 829-836

Publisher

SCIENCE PRESS
DOI: 10.1007/s11426-018-9429-1

Keywords

organic solar cells; conjugated polymer; difluorobenzoxadiazole; open-circuit voltage; energy loss

Funding

  1. Ministry of Science and Technology [2017YFA0206600, 2014CB643501]
  2. National Natural Science Foundation of China [21875072, 21520102006, 91633301]
  3. Recruitment Program of Global Youth Experts of China

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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 (V-oc) of 1.03 V. When blended with perylenediimide-based acceptor (PDI6), the corresponding OSC shows a higher V-oc 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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