Abstract
A temporary photoelectrochemical oxidation of chloride on a pyrite (FeS 2) electrode surface leads to a considerable enhancement of photocurrent response and a decrease of the dark current. In contrast, passage of a dark current or of a photocurrent in presence of iodide has no significant effect. The surface transformation is accompanied by a significant modification of the photocurrent spectrum of the pyrite material. The improvement of the interface is caused by a photocorrosive transformation of the interface which reduces the concentration of surface recombination centers and leads to a change in the concentration and redistribution of energy levels in the forbidden energy region. XPS studies identify the surface states in the pyrite interface, which are responsible for its poor (photo)electrochemical behaviour and which can be removed during chloride oxidation as FeS groups.
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