Dual Donor‐π‐Acceptor Phenoxazine Dyes for Efficient Dye‐Sensitized Solar Cells

A novel D–D–π–A dye (TPC) based on a phenoxazine core and a p‐tolyl auxiliary donor was designed and synthesized. The dye exhibits strong visible‐light absorption, efficient intramolecular charge transfer, and promising performance when applied in dye‐sensitized solar cells (DSSCs). TPC achieved a notable power conversion efficiency (PCE), demonstrating its potential as a high‐efficiency organic sensitizer. When incorporated into DSSCs, the TPC dye exhibited a short‐circuit current density ( J sc ) of 19.01 mA cm −2 , an open‐circuit voltage ( V oc ) of 0.65 V, a fill factor (FF) of 0.62, and a PCE of 7.69% under standard AM 1.5G illumination.