Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 10, Issue 24, Pages 9249-9256Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2tc01433e
Keywords
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Funding
- Engineering and Physics Science Research Council (EPSRC) [EP/N020863/1, EP/V048686/1, EP/T028513/1]
- Royal Society
- Wolfson Foundation
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Two new non-fullerene acceptors were prepared by nucleophilic substitution reactions of a fluorinated precursor, and showed good performance in solar cell blends. Devices based on the fluorinated acceptor exhibited efficient power conversion efficiencies, especially under low light conditions.
Two 2,1,3-benzothiadiazole derivatives annulated with 2-(1,3-dithiol-2-ylidene)malonitrile in the 4,5-positions were prepared by nucleophilic substitution reactions of a fluorinated precursor. The resulting derivatives were coupled to an electron rich indacenodithiophene core to afford two new non-fullerene acceptors (NFAs). Both NFAs exhibited identical absorption spectra in solution, but significant differences in the solid state as a result of the end group fluorination. Both materials performed as electron acceptors in solar cell blends with donor polymers. The resulting devices exhibited high open circuit voltages over 1 V under 1 sun illumination, as a result of their high lying LUMO levels. Devices based on the fluorinated acceptor demonstrated reasonable performance under low light conditions, with power conversion efficiencies up to 13.7%.
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