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Preparation and optical properties of nanocrystalline thin films in the ZnO-TiO2 system

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Abstract

Nanocrystalline compound thin films of ZnO-TiO2 with different Zn/Ti atomic ratios were prepared by radio frequency magnetron reactive sputtering. The optical constants and the optical band gap were investigated using spectroscopic ellipsometry and the optical absorption spectrum. It was found that the cubic ZnTiO3 phase can be obtained with the atomic ratio of Zn to Ti of about 1:1, and transforms to rhombohedral ZnTiO3 phase and a phase mixture of rhombohedral ZnTiO3 and ZnO with increasing Zn content. The refractive index decreases with the increase of Zn content, and the extinction coefficient in the visible range is near zero. The optical band gap was derived from the modeling of ellipsometry data and extinction coefficient spectra, and compared with that obtained from optical absorption spectrum, and it was found that the optical band gaps obtained by these three methods are consistent with each other.

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Authors and Affiliations

  1. Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterial and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, P.R. China

    C. Ye, S.S. Pan, X.M. Teng, H.T. Fan & G.H. Li

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  1. C. Ye
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  2. S.S. Pan
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  3. X.M. Teng
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  4. H.T. Fan
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  5. G.H. Li
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Correspondence to G.H. Li.

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PACS

42.70.-a; 68.55.Jk; 78.20.Ci; 81.15.Cd

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Ye, C., Pan, S., Teng, X. et al. Preparation and optical properties of nanocrystalline thin films in the ZnO-TiO2 system. Appl. Phys. A 90, 375–378 (2008). https://doi.org/10.1007/s00339-007-4289-x

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  • DOI: https://doi.org/10.1007/s00339-007-4289-x

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