Novel dual acceptor (D–D′–A′–π–A) dye-sensitized solar cells based on the triarylamine structure and benzothiadiazole double electron withdrawing unit

Three D–D′–A′–π–A dyes BT4–6 using triarylamine derivatives with varied D′ units as donors were synthesized. The result suggests that the difference of D′ units have significant effects on their physicochemical property and photovoltaic performance.