Benzobisthiazole unit in 4,8-connection mode to build D–A polymer donors achieving high short-circuit current density for organic solar cells

In this work, a series of D–A conjugated polymer donors (PBDT-BBTH, PBDT-BBTF and PBDT-BBTCl) was designed based on the benzobisthiazole (BBT) unit in the 4,8-connection mode with the benzodithiophene (BDT) unit linked by the thiophene π-bridge.