KINETICS OF CHARGE-TRANSFER REACTIONS IN PHOTOELECTROCHEMICAL CELLS

In the present paper, fundamental aspects of charge transfer processes at semiconductor particles and extended electrodes are analyzed and c ompared. Although, in principle, the same reactions occur at particles and electrodes, different factors, such as light intensity, particle size, adsorption of electron donors or acceptors and formation of spac e charges, influence the reaction rates and sometimes even the reactio n route. It is shown that rate constants are preferably determined fro m measurements at extended electrodes. Various mechanisms are discusse d in detail.