Abstract
A comparative study on the electrochemical and photoelectrochemical behavior of SnS thin-film electrode in acidic media was carried out to investigate the SnS-electrolyte interface reactions. The cycling voltammetry examinations were performed to characterize the oxidation and reduction reactions during electrochemical decomposition of the SnS layer in a background solution of 0.1MH2SO4. It was observed the presence of passivating oxide-hydroxide layers on the surface on SnS films and studied dynamics of its formation. The corresponding interface reactions were discussed in details and compared with state-of-the-art in similar researches.Photoelectrochemical measurements show that the decrease of photoactivity of SnS is caused mainly by tin hydroxide ultra-thin layer formation on the SnS surface. On the other hand, after electrochemical reduction of the passivating hydroxide layer the photoactyvity increase is observed e.g. electrochemical oxidation at +1200mV vs. SCE forms on the surface of SnS ultra-thin SnO layer and increases photoactivity almost 4 times.In this paper, special attention is paid to modification of SnS photoabsorber interface by the electrochemical treatment.
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