X‐ray photoelectron and Auger electron spectroscopic analysis of surface treatments and electrochemical decomposition of CuInSe2 photoelectrodes

摘要: CuInSe2 photoanodes can be optimized for use in electrochemical photovoltaic cells, containing aqueous polyiodide as the electrolyte, by wet chemical etching Br2MeOH and subsequent thermal treatment (air oxidation). Surface analyses show formation of a rather clean, Cu‐depleted surface with some adsorbed oxygen after Br2/MeOH etch, indium‐oxygen bonds treatment, accordance previous studies that indium oxides to native ones on this semiconductor. Samples underwent photoanodic decomposition iodide electrolyte those were purposely decomposed acetonitrile showed severe near‐total Cu depletion near their presence lower valent Se. These data complement from solution studies, characterize preferred path sufficiently stabilize type photoelectrochemical cell. Our conclusions are based Auger parameters and, l...