A novel benzodipyrrolidone-based low band gap polymer for organic solar cells

Abstract

A low band gap polymer PBDPDP-DTP, with alternating benzodipyrrolidone (BDP) unit and dithienopyrrole, was synthesized and characterized. A PCE of 2.60% and a Voc of up to 0.74 V were realized in PSCs, which demonstrated the strong potential of BDP as the electron deficient unit in the design of donor–acceptor conjugated polymers for PSCs.