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The passivation of sol–gel TiO 2 by ultra-thin layers of Al-oxide has been investigated using transient and spectral photovoltage (PV) techniques. The ultra-thin layers of Al-oxide were prepared by the ion-layer gas reaction (ILGAR) technique and modified by thermal treatments in air, vacuum or Ar/H 2 S atmosphere. The samples where characterized by elastic recoil detection analysis...
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