Voltammetry under illumination

Figure 1. Voltammetry under illumination with ferrocene in acetonitrile for stability. The system does not stabilize the silicon, as shown by the decrease in current in consecutive Curves 1—4.

KC1, which bathed the CdS film. This system was also investigated by cyclic voltammetry both in the dark and under illumination. Starting at about — 0.9 V, the dark cathodic current exhibited a peak at — 1.15 V due to Cd2+ reduction and then rose to — 1.4 V as a result of hydrogen production. The observed anodic peak at — 0.85 V was attributed to the stripping of cadmium deposits in the lattice (Cd ). Cyclic voltammetry subsequent to illumination resulted in the appearance of cathodic waves at — 1.0 V and — 1.3 V, at the expense of that at — 1.15 V. The anodic peak broadened, as is indicative of photocorrosion. 

Fig. 10.5. Linear sweep voltammetry of illuminated p-GaAs in 1 M H2S04. (a) Before etching (b) after etching (c) after evolving H2 15 min scan speed, v= 100 mV s-1 (d) under dark conditions. (Reprinted from J.O M. Bockris,...

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