Investigation of the Mechanism of Electronic Conductivity and Parameters of Localized States in Porous Anodic Alumina Films Obtained in Phosphoric Acid

The results of studies of electronic conductivity in annealed films of porous anodic alumina obtained in phosphoric acid are presented. Polarization experiments were carried out for an electrolyte-anodic alumina -aluminum structure in a barrier type electrolyte in the anodic potential sweep mode. It is shown that the initial section of the current curve is described by the theory of a current by a limited space charge for the case of electron traps exponentially distributed over energies in the energy gap of anodic alumina. For porous anodic alumina formed in phosphoric acid, it was experimentally determined that the characteristic energy of the distribution of traps in the band gap of anodic alumina is 0.23 eV.