Abstract
For use in ferroelectric memories, the layer structure ferroelectric SrBi2Ta2O9 (SBT) appears to have some stability-related advantages over the more commonly known PZT class of ferroelectrics. Currently we are evaluating the feasibility of integrating this material into a state of the art CMOS memory process. Our primary scientific goal is to identify the intrinsic limitations of SBT which may restrict the engineering applications of films grown by even perfectly optimized processes. To this end we have utilized a wide variety of microanalysis probes to examine polycrystaline SBT films grown under various conditions by both MOD and Flash MOCVD. We have found that X-ray diffraction methods must be supplemented by high resolution X-ray photoelectron spectroscopy (XPS) in order to fully analyze the secondary phases which are commonly incorporated in SBT films. The more complete knowledge of film microstructure that this provides has enabled us to relate phase structure to growth and annealing conditions. XPS has also given us some insight into the initial stages of the growth chemistry of SBT on various Pt surfaces.
Similar content being viewed by others
References
A-C. Paz de Araujo, J. D. Cuchiaro, L. D. McMillan, M. C. Scott and J. F. Scott, Nature 374, 627 (1995).
Mark A. Rodriguez, Timothy J. Boyle, Bernadette A. Hernandezte, Catherine D. Buchheite, and Mark O. Eatough in Polycrystalline Thin Films: Structure, Texture, Properties and Applications II, edited by H. J. Frost, C. A. Ross, M. A. Parker, and E. A. Holm (Mater. Res. Soc. Proc. 403, Pittsburg, PA 1995).
J. Gopalakrishnan, A. Ramanan, C. N. R. Rao, D. A. Jefferson, and David J. Smith, J. Solid State Chem. 55, 101 (1984).
B. Aurivillius, Ark. Kemi. 1, 463 (1949).
G. A. Smolenskii, V. A. Isupov and A. I. Agranovskaya, Sov. Phys. Solid State, 3, 651 (1961)
E. C. Subbarao, J. Phys. Chem. Solids, 23, 665 (1962).
R. E. Newnham, R. W. Wolfe, R. S. Horsey, F. A. Diaz-Colon, and M. I. Kay, Mat. Res. Bull 8, 1183 (1973); D.A. Rae, J.G. Thompson, and R.L. Withers, Acta Cryst. B 48, 428 (1992).
Kazushi Amanuma, Takashi Hase, and Yoichi Miyasaka, Appl. Phys. Lett. 66, 221 (1995); Seshu B. Desu and Tingkai Li, Mat. Sci. and Eng. B34, L4 (1995)
Hitoshi Watanabe, Takashi Mihara, Hiroyuki Yoshimori and Carlos A-Paz de Araujo, Jpn. J. Appl. Phys. 34 5240 (1995).
Satoshi Nanamatsu, Masakazu Kimura, and Tsutomu Kawamura, J. Phys. Soc. Jpn. 38, 817 (1975).
Isao Tanaka, Yuzo Sato and Hironao Kojima, J. Crys. Growth, 99 837 (1990).
D. Mercurio, J. C. Champamaud-Mesjard, B. Frit, P. Conflant, J. C. Boivin, and T. Vogt, J. Solid State Chem. 112, 1 (1994).
Wuzong Zhou, J. Solid State Chem. 101, 1 (1992).
C. D. Gutleben, Y. Ikeda, C. Isobe, A. Machida, T. Ami, K. Hironaka and E. Morita, in Metal-Organic Chemical Vapor Deposition of Electronic Ceramics II, edited by Seshu B. Desu, David B. Beach, and P. C. Van Buskirk, (Mater. Res. Soc. Proc. 415, Pittsburgh, PA 1995).
T. Ami, K. Hironaka, C. Isobe, N. Nagel, M. Sugiyama, Y. Ikeda, K. Watanabe, A. Machida, K. Miura and M. Tanaka, ibid.
S. Doniach and M. Sunjic, J. Phys. C3, 285 (1970).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Gutleben, C.D. The Evaluation of SrBi2Ta2O9 Films for Ferroelectric Memories. MRS Online Proceedings Library 433, 109–118 (1996). https://doi.org/10.1557/PROC-433-109
Published:
Issue Date:
DOI: https://doi.org/10.1557/PROC-433-109