Photoinduced electron transfer from organic dye molecules to semiconductor nanoparticles is
the first and most important reaction step for the mechanism in the so called “wet solar cells” [1]. The time
scale between the photoexcitation of the dye and the electron injection into the conduction band of the
semiconductor colloid varies from a few tens of femtoseconds to nanoseconds, depending on the specific
electron transfer parameters of the system, e.g., electronic coupling or free energy values of donor and acceptor
molecules [2–10]. We show that visible pump/ white light probe is a very efficient tool to investigate
the electron injection reaction allowing to observe simultaneously the relaxation of the excited dye, the injection
process of the electron, the cooling of the injected electron and the charge recombination reaction.
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