The Optical and Elecrtical Properties of Nanocrystalline La 0.4Sr0.6TiO3 Thin Films


The effects of microstructure on the optical properties of La 0.4Sr0.6TiO3 thin films were investigated. Dense films with the thickness of ∼ 200 nm were produced on monocrystalline sapphire substrates by using a polymeric precursor spin coating technique. the films were annealed over the temperature range, 500-800°C. X-ray data showed the formation of a single cubic perovskite-type structure similar to undoped SrTiO3 for annealing temperatures > 500°C. the grain size was varied from 16 to 30 nm by annealing at temperatures up to 800°C. the results of electrical and optical measurements showed a correlation with the microstructure of the films and the electrical conductivity and optical spectra varied with the change of the grain size. from these data, the absorption coefficients were calculated and the band gap energy determined. It was shown that the band gap energy increased as the grain size decreased, which can be explained by the quantum confinement effect.


Materials Science and Engineering

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Article - Conference proceedings

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Publication Date

22 Aug 2005

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