Eugenic metal-free sensitizers with double anchors for high performance dye-sensitized solar cells

A series of new phenothiazine-based dyes (HL5–HL7) with double acceptors/anchors have been synthesized and used as the sensitizers for highly efficient dye-sensitized solar cells (DSSCs). Among them, the HL7-based cell exhibits the best efficiency of 8.32% exceeding the N719-based cell (7.35%) by ∼13%.