Asymmetric Tribranched Dyes: An Intramolecular Cosensitization Approach for Dye-Sensitized Solar Cells

A new multidonor and multianchoring asymmetric tribranched organic photosensitizer (i.e., TB‐PT) for dye‐sensitized solar cells containing three different (D–π–D, D–π1–A, and D–π2–A; D = electron‐rich moiety, A = electron‐poor moiety, π = conjugated bridge) polar branches, two donor cores, and two acceptor/anchoring groups to TiO2 was investigated and compared with the corresponding symmetric dyes. TB‐PT combines the advantages arising from its π‐extended tribranched architecture and the intramolecular cosensitization approach, which results in enhanced tailored optical and energetic properties and, eventually, photovoltaic performances. A multibranched organic dye combining the complementary structural, optical, and electronic properties of the constituting monobranched units is introduced as an intramolecular cosensitization strategy for dye‐sensitized solar cells.