Diketopyrrolopyrrole-Based Donor−Acceptor Copolymers as Organic Sensitizers for Dye Sensitized Solar Cells

In this work diketopyrrolopyrrole based copolymers (PDPP-BBT and TDPP-BBT) containing a donor−acceptor structural unit have been explored as organic sensitizers for quasi-solid state dye sensitized solar cells. Polymer-sensitized solar cells (PSSC) fabricated utilizing PDPP-BBT and TDPP-BBT as the active layer resulted in a typical power conversion efficiency of 1.43% and 2.41%, respectively. The power conversion efficiency of PSSCs based on TDPP-BBT with use of TiCl 4 -modified TiO 2 photoanode was about 3.06%, attributed to the reduced back recombination reaction and more charge carriers in the external circuit.