Ferroelectric phase transitions in films with depletion charge
作者:
A. M. Bratkovsky,
A. P. Levanyuk,
期刊:
AIP Conference Proceedings
(AIP Available online 1900)
卷期:
Volume 535,
issue 1
页码: 229-239
ISSN:0094-243X
年代: 1900
DOI:10.1063/1.1324459
出版商: AIP
数据来源: AIP
摘要:
We consider ferroelectric phase transitions in both short-circuited and biased ferroelectric-semiconductor films with a space (depletion) charge which leads to some unusual behavior. It is shown that in the presence of the charge the polarization separates into ‘switchable’ and ‘non-switchable’ parts. The electric field, appearing due to the space charge, does not wash out the phase transition, which remains second order but takes place at somewhat reduced temperature. At the same time, it leads to a suppression of the ferroelectricity in a near-electrode layer. Influence of the depletion charge on thermodynamic coercive field reduces mainly to the lowering of the phase transition temperature, and its effect is negligible. The depletion charge can, however, facilitate an appearance of the domain structure which would be detrimental for device performance (fatigue). ©2000 American Institute of Physics.
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