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It turns out that the bandgap of "bulk silver(I) oxide" is zero. There is no band gap. What this means is that silver(I) oxide, or Ag2O, is a conductor. The conduction band overlaps the valence band of the silver atoms, and the compound has, therefore, the ability to support the flow of current. But hold the phone. In a specially prepared (non-bulk) form, an Ag2O (with some much less stable AgO) thin film (very, very thin) is formed by deposition on a substrate. The product is then (gently) heat treated, and what emerges is a graduated matrix with more silver on the surface and a rapid transition to the silver oxide substrate. The silver layer is nanometer thick, and the resulting product has developed a band gap and exhibits some p-type semiconductive properties. And, as interesting as this is, the optical properties are even more attractive. This engineering feat has attracted attention and is being investigated because of the possibilities of application to optical memory. Activation energies are on the order of a few tens of thousandths of an eV.
Wiki User
∙ 16y ago
Wiki User
∙ 12y agoIn silver, there is no separation between the valence and conductance band, as they effectively "overlap". This is why silver is a good conductor.
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