Photoinduced electron-transfer processes between phthalocyanines and perylene derivatives

Photoinduced electron-transfer processes between phthalocyanines (H2Pc and ZnPc) as electron donors and perylene derivatives as electron acceptors have been studied using a time-resolved, nanosecond transient absorption method in benzonitrile. The observed findings show that intermolecular electron transfer takes place via the excited triplet states of ZnPc and H2Pc, as confirmed by the characteristic transient absorption bands in the near-IR region. The visible light excitation of the mixtures of H2Pc and the perylene derivatives adsorbed onto TiO2 gave a relatively high photovoltaic efficiency.