LSCO/NBT/LSCO异质结铁电储能性能  

Ferroelectric Energy Storage Properties of LSCO/NBT/LSCO Heterostructure

作　　者：李紫硕 翟亚欣 范佳荫 王晓丹 丁逸 贾明浩 董磊[1] 宋建民[1] 

机构地区：[1]河北农业大学理学院,河北 保定

出　　处：《纳米技术》2021年第3期54-58,共5页Hans Journal of Nanotechnology

摘　　要：采用磁控溅射法和脉冲激光沉积法,以钛酸锶(001)SrTiO3(STO)单晶基片为衬底,制备了La0.5Sr0.5CoO3/Na0.5Bi0.5TiO3/La0.5Sr0.5CoO3(LSCO/NBT/LSCO)铁电电介质电容器,X射线衍射证实了[001]NBT// [001]LSCO//[001]STO外延关系。外延NBT薄膜电容器的有效储能密度Wrec随外加电场的增加呈线性增大规律,在1250 kV/cm时,Wrec达到了25.7 J/cm3,转化效率η为64.7%。此外,在室温到120℃的温度范围内,Wrec和η都具有较好的热稳定性。大的Wrec和热稳定性归因于外延NBT薄膜中较少的缺陷和晶界。La0.5Sr0.5CoO3/ Na0.5Bi0.5TiO3/La0.5Sr0.5CoO3(LSCO/NBT/LSCO) ferroelectric capacitors were fabricated on strontium titanate (001)SrTiO3(STO)single crystal substrates by magnetron sputtering and pulsed laser deposition.The epitaxial relationship of [001]NBT//[001]LSCO/[001] STO was confirmed byX-ray diffraction. The effective energy storage density wrec of epitaxial NBT film capacitor increases linearlywith the increase of applied electric field. At 1250 kV/cm, wrec reaches 25.7 J/cm3,and the conversion efficiency is high η 64.7%. In addition, in the temperature range from room temperature to 120˚C, Wrec and η all have good thermal stability. The larger Wrec and thermal stability are attributed to fewerdefects and grain boundaries in the epitaxial NBT films.

关 键 词：储能密度 钛酸铋钠 异质结 电介质电容器 

分 类 号：O48[理学—固体物理]