Non-fullerene acceptors with alkylthiothiophene side chains for efficient non-halogenated solvent processed indoor organic photovoltaics

New non-fullerene acceptors were synthesized by alkylthiothiophene side chain engineering and the material systems based on the acceptors demonstrated non-halogenated solvent processed indoor organic photovoltaics with an efficiency of 22.38% under 500 lux LED light.