Abstract

The irradiation of an electrode–electrolyte interface with light pulses of an excimer laser causes photocurrent pulses. On metal–electrolyte interfaces in the double-layer region, cathodic photocurrents were found to be caused by photoelectron emission into the electrolyte. If a thin oxide layer covers the electrode surface, anodic photocurrents occur because of electron–hole pair excitation in the semiconducting oxide and a charge separation in the gradient of the electric field across the oxide. The dependence of the anodic photocurrents on the light intensity shows that a threshold intensity and a saturation region can both be used for a characterization of the properties of the oxide layers.

© 1986 Optical Society of America

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