5,6-Bis(octyloxy)-2,1,3-benzoxadiazole-based (X–DADAD)n polymers incorporating electron-donor building blocks used as photoactive materials in organic solar cells.

Three alternating (X–DADAD) n -type copolymers bearing different building blocks (X) in combination with benzoxadiazole (A) and thiophene (D) units were synthesized and studied as photoactive materials in organic solar cells. Superior short circuit currents and power conversion efficiencies (up to 4.4%) were reached when thiophene rather than fluorene or benzodithiophene was used as an X unit. [ABSTRACT FROM AUTHOR]