Effect of halide binding on intramolecular exciplex of double-linked zinc porphyrin-fullerene dyad

► Binding of Cl− and Br− lowered the exciplex energy of the dyad by ∼0.3 eV. ► The oscillator strength of the CT absorption band was increased by ∼15-20%. ► The results are attributed to the electric field created by the halide charge.