石中的可变极化切换特征 Al1- xScxN 铁电膜通过Sc-doping启用
Youdi Gu1, Shu Shi1, Hanxin Su1
1Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore.
Small (Weinheim an der Bergstrasse, Germany)
|July 1, 2025
概括
中较高的 (Sc) 兴奋剂化 (Al1-xScxN) 铁电过渡极化从KAI切换到核限 (NLS) 机制,降低强制场以改善应用.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 铁路电力是铁路的电力.
背景情况:
- 氏体铁电化 (Al1-x-Sc-x-N) 提供了诸如大余分极化和集成兼容性等出色的性能.
- 这些材料中的高强制场 (Ec) 限制了它们的实际应用,需要研究极化切换机制.
- 在Al1-xScxN中,Sc兴奋剂水平和极化切换动力学之间的关系尚不清楚.
研究的目的:
- 在不同的电压和脉冲持续时间下,研究Al1-xScxN (x = 0.25-0.3) 中的极化切换动力学.
- 探索Sc兴奋剂度对偏振切换机制的影响.
- 了解控制偏振切换的基本机制,以减少潜在的Ec.
主要方法:
- 在Al1-xScxN薄膜中对极化切换动力学的实验研究.
- 应用不同的电压幅度和脉冲持续时间来诱导偏振切换.
- 使用科尔莫戈罗夫-阿弗拉米-伊希巴希 (KAI) 模型和核定限切换 (NLS) 概念进行分析.
- 能量分析以阐明兴奋剂诱导的机制过渡.
主要成果:
- Al0.75Sc0.25N表现出与KAI模型一致的统一切换行为.
- Al0.725Sc0.275N显示了一个模两可的切换机制,主要适合KAI模型.
- Al0.7Sc0.3N显示了一个核化有限切换 (NLS) 机制,强制和激活场减少.
- 增加的Sc兴奋剂促进核化部位,降低能量障碍并促进NLS.
结论:
- 更高的Sc兴奋剂水平诱导了从KAI到NLS的过渡,在Al1-xScxN.中的极化切换机制.
- 这种兴奋剂诱导的交叉是由增加的核化位点和减少的能量障碍驱动的.
- 了解这些切换动态对于优化Al1-xScxN对于可靠的铁电应用至关重要.
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