Space charge effect in ultrathin ferroelectric films

Space charge effect in ultrathin ferroelectric films
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超薄铁电薄膜中的空间电荷效应

DOI:
10.1063/1.4704178
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发表时间:
2012-04
影响因子:
3.2
通讯作者:
Li, Hui
Li, Hui
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Lu, Xiaoyan;Cao, Wenwu;Li, Hui

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参考文献

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在静态下,空间电荷对纳米铁电薄膜退极化场的影响变得明显。在考虑空间电荷、表面、不完全屏蔽和失配应变影响的情况下,对双折射铁电薄膜的铁电、介电和压电特性进行了理论研究。研究发现,在薄膜表面附近积累的空间电荷可以改变去极化场,从而导致超薄膜极化增强,甚至在临界厚度以下仍保持极化。在临界厚度附近,介电常数和压电系数的奇异性都被圆化。
Space charge influence on the depolarization field becomes pronounced in nano-scale ferroelectric films in static state. We have studied theoretically the ferroelectric, dielectric, and piezoelectric properties of ultrathin ferroelectric films with the consideration of influence from space charges, surface, incomplete screening, and misfit strain. It is found that space charges accumulated near the surface of the film can modify the depolarization field, which results an enhancement of the polarization in ultrathin films and a persisting polarization even below the critical thickness. The singularities of the dielectric constant and piezoelectric coefficient were all being rounded near the critical thickness.
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