Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 139, Issue 3, Pages 1336-1343Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b12755
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Funding
- 973 Program [2013CB834702]
- NSFC [91433114]
- RGC of Hong Kong GRF [14303314]
- CUHK Direct Grant [4053128]
- Office of Naval Research [N000141410221]
- NSF [DMR-1507249]
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We design and synthesize four fused-ring electron acceptors based on-6,6,12,12-tetrakis(4-hexylphenyl)-indacenobis(dithieno[3,2-b-2',3'-d]thiophene) as the electron-rich unit and 1,1-dicyanomethylene-3-indanones with 0-2 fluorine substituents as the electron-deficient units. These four molecules exhibit broad (550-850 nm) and strong absorption with high extinction coefficients of (2.1-2.5) x 10(5) M-1 cm(-1). Fluorine substitution downshifts the LUMO energy level, red-shifts the absorption spectrum, and enhances electron mobility. The polymer solar cells based on the fluorinated electron acceptors exhibit power conversion efficiencies as high as 11.5%, much higher than that of their nonfluorinated counterpart (7.7%). We investigate the effects of the fluorine atom number and position on electronic properties, charge transport, film morphology, and photovoltaic properties.
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