Abstract
The cathodic current-voltage curve on n-GaAs electrodes has been investigated under illumination or after pre-illumination. A possible majority carrier photoeffect is suppressed in both acidic and alkaline solution, presumably by light-driven chemisorption intermediates of hydrogen evolution. A minor illumination-dependent cathodic current peak in the μA range can be attributed to the re-reduction of dissolved As-oxidation products. The influence of pretreatment and of the crystal face has been studied
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