Abstract
Current oscillations have been obtained in the anodical region of sulphidization of various Cd x Hg 1− x Te (CMT) compounds in basic solutions containing Cs + and S 2− ions. According to X-ray photoelectron spectroscopy studies, it is possible to correlate these oscillations to the changes of the Cs surface concentration. After anodization, the samples showed an increase in the Cd/Hg and Hg/Te ratios (changed from Cd 0.2Hg 0.8Te to Cd 1.5HgTe). The surface concentrations of OH and Cs change synchronously with the oscillations. These observations are explained by the same model which was previously suggested for the photocurrent oscillations on CdTe (mainly a formation/dissolution of a submonolayer of Te). The anodic reaction corresponds to the decomposition of the CdTe fraction of the alloy with the formation of soluble Te compounds, a thin remaining Te and a CdS-deposit on the surface.
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