Femtosecond fluorescence dynamics of zinc biphenylporphine in nanocrystalline TiO2 films: Evidence for interfacial electron transfer through space

Both through-bond and through-space interfacial electron transfer (IET) processes may occur on the interface of a photosensitizer and a semiconductor. Here we provide direct evidence for the observation of through-space IET process between Zinc biphenylporphyrin molecules and TiO2 nanoparticles based on photocurrent and femtosecond up-conversion measurements.