Laser Raman spectroscopy of colloidal semiconductor photosensitizers

Colloidal semiconductor photosensitizers have been used as heterogeneous catalysts for the chemical solar energy conversion processes. The use of Raman spectroscopy to address the problems related to colloidal semiconductors and photosensitization reactions is reviewed. In particular, the adsorption characteristics of various secondary sensitizers and their electron-transfer reactions are studied using resonance Raman and time-resolved resonance Raman spectroscopy. Finally, the importance of the quantum size effect of colloidal semiconductors in relation to their catalytic effects is presented with particular reference to their influence on photosensitizing properties