Photoluminescence Studies on the Supramolecular Interactions Between a Pyrollidinofullerene and Zinc‐Phthalocyanine Used in Organic Solar Cells

We present a study of supramolecular interactions between a highly soluble pyrollidinofullerene bearing three chelating pyridyl groups (PyF) and zinc‐phthalocyanine (ZnPc). Photoluminescence quenching shows a non‐diffusive concentration dependency, which can be explained by the formation of a non‐covalently bonded supramolecular dyad. A further indication for such a complexation is observed by a significantly increased solubility of ZnPc in CH2Cl2 upon addition of PyF. Solar cells fabricated from a thin evaporated layer of ZnPc and a spincoated layer of PyF show short‐circuit current densities of approximately 4 mA/cm2 with open circuit voltages around 400 mV under 100 mW/cm2 simulated AM1.5 illumination.