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Role of Silver Doping in the Improvement of Electrical Properties of (Ba, Sr)TiO3 Thin Films

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In this paper we report the fabrication and characterization of Ag/(Ba, Sr)TiO3 /LaNiO3/LaAlO3 capacitors. All the films, including the top (silver) and bottom (LaNiO3) electrodes, were deposited using a pulsed laser deposition technique. The electrical and dielectric properties of (Ba, Sr)TiO3 capacitors were found to improve significantly by means of silver doping. For example, the leakage current density of a Ag/Ag-doped-(Ba, Sr)TiO3 /LaNiO3/ capacitor was about an order of magnitude lower and dielectric constant was ∼40 % higher than that of a Ag/(Ba, Sr)TiO3 /LaNiO3/capacitor over a range of biases. The improvement in the electrical properties of (Ba, Sr)TiO3 films is believed to be caused by a double role of silver. The first one is associated with the reduced oxygen vacancies due to improved oxygenation of BST films in presence of silver and the second one is associated unpinning effect of domain walls again in presence of silver.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Florida, Gainesville, Florida, 32611-6400, USA

    Anuranjan Srivastava, D. Kumar & Rajiv K. Singh

  2. Department of Electrical and Computer Engineering, University of Florida, Gainesville, Florida, 32611, USA

    Harish Venkataraman & William R. Eisenstadt

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  1. Anuranjan Srivastava
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  2. D. Kumar
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  3. Rajiv K. Singh
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  4. Harish Venkataraman
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  5. William R. Eisenstadt
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Srivastava, A., Kumar, D., Singh, R.K. et al. Role of Silver Doping in the Improvement of Electrical Properties of (Ba, Sr)TiO3 Thin Films. MRS Online Proceedings Library 567, 463–467 (1999). https://doi.org/10.1557/PROC-567-463

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