机械可控非线性电介质

Mechanically controllable nonlinear dielectrics.

作者信息

Ko D L, Tsai M F, Chen J W, Shao P W, Tan Y Z, Wang J J, Ho S Z, Lai Y H, Chueh Y L, Chen Y C, Tsai D P, Chen L-Q, Chu Y H

机构信息

Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan.

Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan.

出版信息

Sci Adv. 2020 Mar 6;6(10):eaaz3180. doi: 10.1126/sciadv.aaz3180. eCollection 2020 Mar.

DOI:10.1126/sciadv.aaz3180

PMID:32181365

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7060063/

Abstract

Strain-sensitive Ba Sr TiO perovskite systems are widely used because of their superior nonlinear dielectric behaviors. In this research, new heterostructures including paraelectric BaSrTiO (BSTO) and ferroelectric BaTiO (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.

摘要

应变敏感的钛酸钡锶钙钛矿体系因其优异的非线性介电行为而被广泛应用。在本研究中，包括顺电钛酸钡锶（BSTO）和铁电钛酸钡（BTO）材料的新型异质结构在柔性白云母衬底上外延制备。通过简单弯曲，施加机械力可将BSTO的介电常数调节-77%至36%，并使基于BTO的铁电场效应晶体管的沟道电流改变两个数量级。通过探索相变和确定能带结构研究了详细机制。此外，进行了相场模拟以提供理论支持。本研究为基于高质量氧化物异质外延的机械可控组件开辟了一条新途径。