A model for Schottky barrier‐like heterojunction photoelectrodes is presented. This model allows the calculation of the current‐voltage curves for such electrodes under different conditions of illumination and electrochemical charge transfer. SnO 2 ‐ coated n‐type Si electrodes in contact with the redox systems K 3 / K 4 Fe ( CN ) 6 and Cl 2 Cl − show experimental photocurrent‐voltage curves with the behavior predicted by the model. The effect of the charge transfer overvoltage and the expected current limitation due to photon control and/or redox ion diffusion are demonstrated. The feasibility of solar energy conversion through photoelectrolysis, by means of cells based on heterojunction photoelectrodes, is discussed.
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Decker et al. (1983) studied this question.