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Title: Time-dependent space-charge-limited conduction as a possible origin of the polarization offsets observed in compositionally graded ferroelectric films
Authors: Chan, HK
Lam, CH 
Shin, FG
Issue Date: 1-Mar-2004
Source: Journal of applied physics, 1 Mar. 2004, v. 95, no. 5, p. 2665-2671
Abstract: We investigated the effects of free space charges on hysteresis-loop measurement of compositionally graded ferroelectrics and found that they are quite likely to be responsible for the "polarization offsets" observed in experiments. Taking into account conduction by those free space charges, or time-dependent space-charge-limited conduction, our computer simulation of compositionally graded lead zirconate titanate, which is placed in the Sawyer–Tower circuit and driven by an alternating applied voltage, produced shifting of measured hysteresis loops where the shift magnitudes are comparable with published experimental data. It also produced the key features as observed in experiments: The "offsets:" (a) have a monotonous increase with electric-field amplitude, (b) change in direction when the composition gradient is inverted, and (c) develop like the typical charging-up of a capacitor. All these results suggest that time-dependent space-charge-limited conduction is a possible origin of the polarization offsets observed in compositionally graded ferroelectrics.
Keywords: Ferroelectric thin films
Dielectric hysteresis
Space charge
Polarisation
Publisher: American Institute of Physics
Journal: Journal of applied physics 
ISSN: 0021-8979
EISSN: 1089-7550
DOI: 10.1063/1.1647258
Rights: © 2004 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in H. K. Chan, C. H. Lam & F. G. Shin, J. Appl. Phys. 95, 2665 (2004) and may be found at http://link.aip.org/link/?jap/95/2665.
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