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Effects of composition on the microstructure of YBa2Cu3O7−x thin films prepared by plasma-enhanced metalorganic chemical vapor deposition

Published online by Cambridge University Press:  31 January 2011

P. Lu ,
J. Zhao ,
C.S. Chern ,
Y.Q. Li ,
G.A. Kulesha ,
B. Gallois ,
P. Norris ,
B. Kear  and
F. Cosandey
P. Lu
Affiliation:
Department of Mechanics and Materials Science, Rutgers University, Piscataway, New Jersey 08855
J. Zhao
Affiliation:
EMCORE Corporation, 35 Elizabeth Avenue, Somerset, New Jersey 08873
C.S. Chern
Affiliation:
Department of Mechanics and Materials Science, Rutgers University, Piscataway, New Jersey 08855
Y.Q. Li
Affiliation:
Department of Materials Science and Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030
G.A. Kulesha
Affiliation:
Department of Materials Science and Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030
B. Gallois
Affiliation:
Department of Materials Science and Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030
P. Norris
Affiliation:
EMCORE Corporation, 35 Elizabeth Avenue, Somerset, New Jersey 08873
B. Kear
Affiliation:
Department of Mechanics and Materials Science, Rutgers University, Piscataway, New Jersey 08855
F. Cosandey
Affiliation:
Department of Mechanics and Materials Science, Rutgers University, Piscataway, New Jersey 08855
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Abstract

The microstructures of (A) near stoichiometric, (B) Y-rich, and (C) Y- and Cu-rich YBa2Cu3O7−x thin films have been studied by high-resolution transmission electron microscopy. The films were deposited on (100) LaAlO3 by plasma-enhanced metalorganic chemical vapor deposition. In near stoichiometric films, microstructural features similar to those of thin films deposited by other techniques have been observed. These features which include epitaxial growth with the c-axis perpendicular to the substrate, twin boundaries on (110) planes, and stacking faults on (100) and (001) planes were also present in the off-stoichiometric materials. In Y-rich thin films, yttria (Y2O3) precipitates with an average size of about 5 nm have been identified in the matrix. The precipitates are uniformly distributed, have a high density as large as 1024/m3, and are highly oriented with respect to the matrix. In Y- and Cu-rich thin films, CuO particles up to 1 μm in size were observed on the surfaces of the films. The observed microstructural features were similar to those of the Y-rich materials.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 8 , August 1992 , pp. 1993 - 2002
Copyright
Copyright © Materials Research Society 1992

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