Ferrocene‐Diketopyrrolopyrrole Chromophores: Design, Properties, and Multifunctional Applications

ABSTRACT The unique redox behavior and excellent stability of ferrocene when incorporated into the diketopyrrolopyrrole (DPP) dye have made a fascinating class of multifunctional materials. This review provides a detailed overview of the developments in ferrocene‐DPP‐based organometallic chromophores, focusing on their design, synthesis, and optoelectronic properties. We also discuss their use in light‐harvesting systems, solar cells, nonlinear optics (NLO), and photothermal cancer therapy, as well as the newer application in artificial nociceptors. Ferrocene‐DPP complexes show strong and broad visible to near‐infrared (NIR) absorption with high molar extinction coefficients and exceptional thermal stability, making them very useful for advanced optoelectronic devices. Beyond their standard electronic applications, we highlight their performance as non‐fullerene acceptors in organic solar cells (OSCs). Finally, we provide an overview of the current key challenges and future research directions in the development of the ferrocene‐DPP field.