Quantum Efficiencies, Regeneration, and Supersensitization

The quantum efficiency rp defined as the ratio of the number of electrons transferred across the interface, and of the number of photons absorbed by the adsorbed dye layer, is not easy to determine. This is on account of the problems of measuring the light absorption by one monolayer or separating it from the absorption by the dye solution. Therefore, many scientists prefer to give values of 

Accordingly, the excited sensitizer was reduced by an electron donor before the electron transfer occurred. This process competes with the recombination given by Eq. (10.10). Such a supersensitization was never really proved. It is assumed that the 

10 Electron Transfer Processes - Excited Molecules and Semiconductor Electrodes 

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