Abstract
The electrochemical behaviour of n- and p-GaSb samples was explored with or without Ce 4+ salts diluted in 2 M H 2SO 4 solutions. In the presence of Ce 4+ we observed a typical reduction current that is attributed to a pure hole injection during the Ce 4+ reduction in Ce 3+. As for the other III–V compounds, the holes collected at the surface give rise to the anodic dissolution of the material. No electron injection was observed in the conduction band from corrosion intermediates. All the processes take place on a Sb-enriched oxidized surface characterized by XPS measurements. The two-step process of the GaSb dissolution in the presence of Ce 4+ species is not perturbed by this Sb-enriched oxidized surface.
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