Abstract

The study results of optical properties of amorphous nanosized TiO₂:Ag composite films with the structure of an amorphous TiO₂ matrix with inclusions of isolated Ag nanoparticles are presented. The TiO₂:Ag films were obtained by ion-plasma high-frequency magnetron co-sputtering of a polycrystalline TiO₂ and Ag target. The films were 40–50 nm thick, and the maximum silver concentration reached 9.0 at.%. The fundamental absorption band edge was analyzed for different possible absorption laws. It is shown that, in TiO₂ and TiO₂:Ag films, the edge of the fundamental absorption band is formed mainly due to indirect allowed optical transitions (the quadratic absorption law), and this absorption law does not change with increasing silver concentration. The optical bandgap in TiO₂:Ag films depends on the Ag concentration and is determined by the degree of order in the amorphous matrix.

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