Space charges and size effects in semiconducting ferroelectric BaTiO3/SrTiO3 superlattices

被引：25
|
作者：
Liu, Y. Y. [2 ]
Li, J. Y. [1 ]
机构：
[1] Univ Washington, Dept Mech Engn, Seattle, WA 98195 USA
[2] Xiangtan Univ, Key Lab Low Dimens Mat & Applicat Technol, Minist Educ, Fac Mat Optoelect & Phys, Xiangtan 411105, Hunan, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2010年 / 97卷 / 04期
关键词：
barium compounds; continuum mechanics; dielectric hysteresis; dielectric polarisation; ferroelectric materials; Maxwell equations; semiconductor superlattices; size effect; space charge; strontium compounds; wide band gap semiconductors; POLARIZATION ENHANCEMENT; PHASE-TRANSITIONS; THIN-FILMS;
D O I：
10.1063/1.3473821
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A continuum theory is developed to investigate the effects of space charges and size on ferroelectric superlattices, treating the ferroelectric perovskites as wide band-gap semiconductors instead of insulators, making it possible to couple the distribution of polarization and space charges through Maxwell's equation. It is found that the space charges tend to accumulate near the superlattice interface, resulting in large electric field near the interface, and thus enhanced polarization and asymmetric hysteresis loop. It also eliminates the uniform polarization that would exist in the superlattice in the absence of space charges. The effect of superlattice thickness is also investigated, and good agreements with experiments are observed. (C) 2010 American Institute of Physics. [doi:10.1063/1.3473821]
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页数：3
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