ELECTRONIC PARAMETERS OF Cu(I) AND Cu(II) OXIDES ANODICALY FORMED ON COPPER SINGLE CRYSTALS
Photoelectrochemical and impedance measurements were used to investigate the electronic properties of Cu(I) and Cu(II) oxides anodically formed on Cu(100), Cu(110) and Cu(111) in deoxygenated 0.1 M KOH. The corrosion stability increases at transition from polycrystalline copper to single crystals. Preliminary anodic oxidation inhibits the copper corrosion by the traces of dissolved oxygen. Corrosion oxides as well as anodic Cu(I) и Cu(II) oxides on copper single crystals are p-type semiconductors. The optical absorption coefficient and band gap in Cu(I) and Cu(II) oxides do not depend on the crystallographic orientation of copper substrate. At transition from polycrystalline copper to single crystals the flat band potential in Cu(I) and Cu(II) oxides slightly shifts negative, the concentration of charge carriers decreases.