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Facile synthesis of annulated benzothiadiazole derivatives and their application as medium band gap acceptors in organic photovoltaic devices
Journal of Materials Chemistry C, Volume: 10, Issue: 24, Pages: 9249 - 9256
Swansea University Authors: Ram Datt, Harrison Lee, Wing Chung Tsoi
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DOI (Published version): 10.1039/d2tc01433e
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-f...
|Published in:||Journal of Materials Chemistry C|
Royal Society of Chemistry (RSC)
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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%.
Faculty of Science and Engineering
We would like to thank the Engineering and Physics Science Research Council (EPSRC) (EP/N020863/1, EP/V048686/1 and EP/T028513/1) and the Royal Society and Wolfson Foundation for financial support.