Charge and energy transfer in complex systems

The increasing energy demand in the near future will force us to seek environmentally clean alternative energy resources. The present thesis ts in this context. Therefore, the aim of the work is to obtain pieces of information about systems capable to give photoinduced charge transfer for their application in third generation photovoltaic systems, such DSSC and solar concentrators. In addition some supramolecular systems have been investigated for excited energy transfer in order to be used as antenna system in artificial photosynthetic devices. These experiments were performed with steady-state photochemical measurements and ultrafast laser technique in order to allow a better understanding of the overall mechanisms and the optical properties of these systems.