Effect of orientation of crystal face of silver and its alloying with gold on properties of thin anodic Ag(I) oxide films: II. Photopotential |
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Authors: | D A Kudryashov S N Grushevskaya O Olalekan N V Kukhareva A V Vvedenskii |
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Affiliation: | (1) Department of Physical Chemistry, Voronezh State University, Universitetskaya pl. 1, Voronezh, 394006, Russia |
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Abstract: | The current efficiency of the formation of anodic oxide on polycrystalline silver is shown to decrease with an increase in
the concentration of KOH solutions, while the rate-limiting stage remains the solid-phase mass transfer. Photopotential in
nano-size Ag(I) oxide films anodically formed on polycrystalline silver is independent of the OH− ion concentration, which means that a photoresponse is generated in the bulk oxide. The n-type conductivity of oxide films on silver, Ag-Au alloys, and low-index silver crystal faces, which was determined previously
when measuring photocurrent, is confirmed. Replacing polycrystalline silver with its monocrystals results in a substantial
decrease in the photopotential amplitude due to the decrease in the deviation from a stoichiometric composition. The electron
mobility and the partial electronic photoconductivity in the anodic Ag(I) oxide depend on the orientatinon of the crystal
face in silver and the gold content. At E = 0.56 V, a series of changes in these characteristics correlates to the changes in other structure-dependent parameters
of Ag2O oxide (the optical absorption coefficient α, the concentration of donor defects N
D, the width of the spatial charge region W, and the Debye screening length L
D). |
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