An ellipsometric study of the electrochemical surface modifications of n-InP

The cathodic decomposition of InP is studied by cyclic voltammetry and in situ ellipsometry. During the hydrogen evolution, an indium-rich film grows on the surface of the semiconductor. Afterward, this film undergoes transformations between oxidized and reduced forms following the electrode polarization. A theoretical model based upon a three: ''InP/oxide or indium/electrolyte'' or a four: ''InP/oxide/indium/electrolyte'' medium enables one to correctly interpret the ellipsometric data.