Ternary Chalcogenide‐Based Photoelectrochemical Cells: VII . Analysis of the Chemical Processes Occurring at the Surface during Photoelectrochemical Operation

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Abstract
The photoelectrochemical properties of the ternary semiconductor is further investigated. Photoelectrochemical etching increases the photocurrent of this material by an order of magnitude in various electrolytes. Cyclic voltametry, Auger analyses, and thermodynamic calculations suggest that oxide is unlikely to be produced during photoetching. Degradation of the photocurrent with time in polysulfide electrolyte due to photocorrosion is studied with x‐ray photoelectron spectroscopy (XPS). Thermodynamic and solid‐state data are used for the construction of the band diagram of system. It is shown that the time behavior of this system resembles that of photoelectrochemical cell.