期刊
ADVANCED MATERIALS
卷 32, 期 21, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202000645
关键词
3D stacking; fluorination; fused-ring electron acceptors; nonfullerene acceptors; polymer solar cells
类别
资金
- NSFC [21734001, 51761165023, 21733005, 51761135101, 21534003, 21875182]
- Ministry of Science and Technology [2016YFA0200700]
- 111 project 2.0 [BP2018008]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
A new fluorinated electron acceptor (FINIC) based on 6,6,12,12-tetrakis(3-fluoro-4-hexylphenyl)-indacenobis(dithieno[3,2-b;2 ',3 '-d]thiophene) as the electron-donating central core and 5,6-difluoro-3-(1,1-dicyanomethylene)-1-indanone as the electron-deficient end groups is rationally designed and synthesized. FINIC shows similar absorption profile in dilute solution to the nonfluorinated analogue INIC. However, compared with INIC, FINIC film shows red-shifted absorption, down-shifted frontier molecular orbital energy levels, enhanced crystallinity, and more ordered molecular packing. Single-crystal structure data show that FINIC molecules pack into closer 3D network motif through H-bonding and pi-pi interaction, while INIC molecules pack into incompact honeycomb motif through only pi-pi stacking. Theoretical calculations reveal that FINIC has stronger electronic coupling and more molecular interactions than INIC. FINIC has higher electron mobilities in both horizontal and vertical directions than INIC. Moreover, FINIC and INIC support efficient 3D exciton transport. PBD-SF/FINIC blend has a larger driving force for exciton splitting, more efficient charge transfer and photoinduced charge generation. Finally, the organic solar cells based on PBD-SF/FINIC blend yield power conversion efficiency of 14.0%, far exceeding that of the PBD-SF/INIC-based devices (5.1%).
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