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Comments on the effects of solution precursor characteristics and thermal processing conditions on the crystallization behavior of sol-gel derived lead zirconate titanate thin films

Published online by Cambridge University Press:  31 January 2011

R. W. Schwartz ,
J. A. Voigt ,
B. A. Tuttle ,
D. A. Payne ,
T. L. Reichert  and
R. S. DaSalla
R. W. Schwartz
Affiliation:
Sandia National Laboratories, Materials and Process Sciences Center, Albuquerque, New Mexico 87185
J. A. Voigt
Affiliation:
Sandia National Laboratories, Materials and Process Sciences Center, Albuquerque, New Mexico 87185
B. A. Tuttle
Affiliation:
Sandia National Laboratories, Materials and Process Sciences Center, Albuquerque, New Mexico 87185
D. A. Payne
Affiliation:
Department of Materials Science and Engineering, Seitz Materials Research Laboratory, and Beckman Institute, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
T. L. Reichert
Affiliation:
Sandia National Laboratories, Materials and Process Sciences Center, Albuquerque, New Mexico 87185
R. S. DaSalla
Affiliation:
Sandia National Laboratories, Materials and Process Sciences Center, Albuquerque, New Mexico 87185
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Abstract

Lead zirconate titanate (PZT 40/60) thin films were fabricated on electroded silicon wafers using chemical solution deposition. Two different chelating agents, acetic acid and acetylacetone, were used in the synthesis of the precursor solutions. The microstructure of the acetylacetone-derived film was characterized by nucleation at the platinum electrode and a columnar growth morphology (˜100−200 nm lateral grain size). In contrast, the acetic acid-derived film was characterized by both columnar grains nucleated at the electrode, and larger (˜1 μm) grains nucleated at the surface of the film. Using Fourier transform infrared (FTIR) diffuse reflectance spectroscopy, we also noted that the pyrolysis behavior of the films was dependent on the chelating agent employed. The acetylacetone-derived films, which displayed only one nucleation event, were also characterized by a higher pyrolysis temperature than the acetic acid-derived films. Previously, microstructural differences of this nature were attributed to variations in “precursor structure.” In this paper, we discuss an alternative mechanism for the observed microstructural variations in films prepared from different solution precursors. In the model proposed, we discuss how changes in film pyrolysis temperature result in a change in film crystallization temperature, and hence, a change in the effective driving force for crystallization. We show how the change in crystallization driving force is expected to impact the thin film microstructure due to the accompanying variations that occur in the barrier heights for interface (lower electrode) and surface nucleation. A standard approach to nucleation in glasses is used as the basis of the proposed model. Finally, we also discuss how the model can be used to understand the observed effects of heating rate and thickness on the microstructure of solution-derived thin films.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 2 , February 1997 , pp. 444 - 456
Copyright
Copyright © Materials Research Society 1997

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