Trifluoromethyl-substituted asymmetric non-fullerene acceptors enable non-halogenated solvent-processed indoor organic photovoltaics with an efficiency of over 30%

Four asymmetric non-fullerene acceptors were synthesized. Additive-free, non-halogen solvent-processed indoor organic photovoltaics achieved efficiencies of 27.1% and 30.2% under 1000 lux LED and fluorescent light, respectively.