A novel compact DPP dye with enhanced light harvesting and charge transfer properties for highly efficient DSCs

A novel compact diketopyrrolopyrrole (DPP) dye was designed and synthesized using DPP core as a bridge to connect bis(4-tert-butylphenyl)phenylamine and cyanoacetic acid units with the D–π–A configuration, and employed as a sensitizer in dye-sensitized solar cells, giving a high power conversion efficiency of 8.61% under AM 1.5 conditions.