Side-chain manipulation on accepting units of two-dimensional benzo[1,2-b:4,5-b′]dithiophene polymers for organic photovoltaics

Two donor–acceptor alternating polymers of bis(octylthio)thienyl BDT and fluorinated BT or 5-dodecylthienyl-6-fluorobenzo[c][1,2,5]thiadiazole were designed for organic photovoltaics.