The two pairs of structurally related donor–acceptor polymers(P1–P4) derived from diketopyrrolopyrrole(DPP) and diazapentalene(DAP) building blocks were synthesized and compared for their optical and photovoltaic properties with potential applications in solar cells and near-infrared (NIR) photodetectors. Having the electron-rich fluoreneand bis(2′-thienyl)pyrrole (TPT) units as donors, the synthesized donor–acceptor polymershave band gap levels in the range 1.22–1.79 eV. The solar cells based on the blend of P2 (DPP–TPTpolymer) and PC₇₁BM exhibited the best performance, showing a V_ocof 0.61 V, J_scof 10.38 mA cm^?2, FF of 0.44 and PCE of 2.8%. The photodetector based on the NIR-absorbing P4 (DAP–TPTpolymer) displayed a good photovoltaic response over a wide spectral range of 400–1100 nm and an EQE of 13% and detectivity of 2.3 × 10¹⁰Jones at 800 nm.

全文链接：http://pubs.rsc.org/en/content/articlelanding/2012/jm/c2jm30868a#!divAbstract