Effect of the Crystal Face Orientation and Alloying with Gold on the Properties of Thin Anodic Films of Ag(I) Oxide: I. Photocurrent D. A. Kudryashov, S. N. Grushevskaya, S. V. Ganzha, and A. V. Vvedenskii Voronezh State University, Universitetskaya pl. 1, Voronezh, 394006 Russia e-mail:
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Received September 5, 2008 Abstract — The anodic formation of nano-size anodic films of Ag(I) oxide on polycrystalline silver and Ag–Au alloys, as well as on low-index monocrystalline silver faces in 0.1 M KOH, is studied. Based on the data of photocurrent measurements, the n-kind of the oxide film conductivity is determined. Replacing the polycrystalline silver with monocrystals, as well as adding a small amount of gold atoms to its lattice (X[Au] <= 4 at. %), results in substantial structure ordering of the oxide due to the decrease in the deviation from the stoichiometric composition. The structure-dependent parameters of Ag(I) oxide (the optical absorption coefficient , the concentration of donor defects ND, the width of the spatial charge region W, and the Debye screening length LD) are determined by the silver crystal face orientation, the gold content, and the film formation potential. At E = 0.52V, the series of changes in these characteristics correlate with the series of reticular density. An increase in E breaks the series and increases the deviation of the composition from the stoichiometric Ag2O composition. PACS numbers: 73.50.Pz, 81.07.-b, 82.45.Cc DOI: 10.1134/S2070205109050013
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