Mechanically controllable nonlinear dielectrics
Mechanically controllable nonlinear dielectrics
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DOI：
10.1126/sciadv.aaz3180
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发表时间：
2020-03
期刊：
影响因子：
13.6
通讯作者：
D. Ko;M. Tsai;Jhih Wei Chen;P. Shao;Y. Tan;Jing Wang;Sheng-Zhu Ho;Yu-Hong Lai;Y. Chueh
中科院分区：
文献类型：
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作者：
D. Ko;M. Tsai;Jhih Wei Chen;P. Shao;Y. Tan;Jing Wang;Sheng-Zhu Ho;Yu-Hong Lai;Y. Chueh
非线性弯曲的控制可以通过机械弯曲来实现。应变敏感的Sr1 − xTiO 3钙钛矿体系由于其上级非线性介电行为而被广泛使用。本研究在柔性白云母衬底上外延制备了顺电Ba0.5Sr0.5TiO3（BSTO）和铁电BaTiO3（BTO）两种新型异质结构材料。通过简单的弯曲，施加机械力可以将BSTO的介电常数从−77调节到36%，并将BTO基铁电场效应晶体管的沟道电流调节两个数量级。通过对相变过程的探讨和能带结构的测定，对详细的机理进行了探讨.此外，还进行了相场模拟，为理论分析提供了理论支持。该研究为基于高质量氧化物异质外延的机械可控元件开辟了新途径。
Control of nonlinear dielectrics can be realized by mechanical bending. Strain-sensitive BaxSr1−xTiO3 perovskite systems are widely used because of their superior nonlinear dielectric behaviors. In this research, new heterostructures including paraelectric Ba0.5Sr0.5TiO3 (BSTO) and ferroelectric BaTiO3 (BTO) materials were epitaxially fabricated on flexible muscovite substrate. Through simple bending, the application of mechanical force can regulate the dielectric constant of BSTO from −77 to 36% and the channel current of BTO-based ferroelectric field effect transistor by two orders. The detailed mechanism was studied through the exploration of phase transition and determination of band structure. In addition, the phase-field simulations were implemented to provide theoretical support. This research opens a new avenue for mechanically controllable components based on high-quality oxide heteroepitaxy.