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(1-x)SrBi2Ta2O9-xBi3Ti(TayNb1-y)O9 Layered Structure Solid Solutions for Ferroelectric Random Access Memory Devices

Published online by Cambridge University Press:  10 February 2011

P. C. Joshi
Affiliation:
Department of Materials Science and Engineering, 213 Holden Hall, Virginia Tech, Blacksburg, VA 24061-0237
S. O. Ryu
Affiliation:
Department of Materials Science and Engineering, 213 Holden Hall, Virginia Tech, Blacksburg, VA 24061-0237
S. Tirumala
Affiliation:
Department of Materials Science and Engineering, 213 Holden Hall, Virginia Tech, Blacksburg, VA 24061-0237
S. B. Desu
Affiliation:
Department of Materials Science and Engineering, 213 Holden Hall, Virginia Tech, Blacksburg, VA 24061-0237
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Abstract

Thin films of layered-structure solid-solution material, (1−x)SrBi2Ta2O9−xBi3Ti(TayNb1−y)O9, have shown much improved ferroelectric properties compared to SrBi2Ta2O9, a leading candidate material for ferroelectric random access memory applications. The higher P r , higher T c , and lower crystallization temperature of the thin films of solid solution material promise to solve many problems with the present materials of interest. The films were fabricated by metalorganic solution deposition technique using room temperature processed alkoxide-carboxylate precursor solution and characterized in terms of structural, dielectric, and ferroelectric properties. It was possible to obtain a pyrochlore free crystalline phase at an annealing temperature of 600 °C. The effects of annealing temperature and excess Bi content on the film microstructure and properties were analyzed. The electrical measurements were conducted on metal-ferroelectric-metal (MFM) capacitors using Pt as the top and bottom electrode. It was possible to obtain good ferroelectric properties on films annealed at 650 °C. For example, thin films with 0.7SrBi2Ta2O9-0.3Bi3TiTaO9 composition, which were annealed at 650 °C, exhibited typical 2P r and E c values of 12.4 μC/cm2 and 80 kV/cm, respectively. The films exhibited low leakage current density, good fatigue characteristics under bipolar stressing at least up to 1010 switching cycles, and good memory retention characteristics after about 106 s of memory retention indicating a favorable behavior for memory applications.

Type
Research Article
Copyright
Copyright © Materials Research Society 1998

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References

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(1-x)SrBi2Ta2O9-xBi3Ti(TayNb1-y)O9 Layered Structure Solid Solutions for Ferroelectric Random Access Memory Devices
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