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Electrochemical Potential Gradients in Pb(Zr,Ti)O3 Thin Films

Published online by Cambridge University Press:  10 February 2011

M. Brazier ,
S. Mansour  and
M. McElfresh
M. Brazier
Affiliation:
Department of Physics, Purdue University, West Lafayette, IN 47907
S. Mansour
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, IN 47907
M. McElfresh
Affiliation:
Department of Physics, Purdue University, West Lafayette, IN 47907
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Abstract

Thin film PbZr0.55Ti0.45O3 (PZT) capacitors were observed to develop a dc voltage offset when driven with an ac applied electric field. This voltage offset displayed a strong dependence on the ambient oxygen partial pressure, PO2, of the atmosphere above the film, in addition to applied electric field and temperature dependencies. A scenario is proposed wherein a chemical potential gradient is established in the film, the magnitude of which is determined by the ambient PO2. The subsequent redistribution of oxygen vacancies is thought to create the observed voltage offset. This hypothesis was supported by the observation of similar voltage offsets in compositionally graded PZT films. This effect shows promise for novel low-temperature oxygen sensing applications.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 541: Symposium O – Ferroelectric Thin Films VII , 1998 , 507
Copyright
Copyright © Materials Research Society 1999

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References

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