采用脉冲激光沉积系统分别在LaAlO3(001)和MgO(001)衬底上沉积了Ba06Sr04TiO3(BST)薄膜,以Pt做电极分别构架了Pt/BST/MgO和Pt/BST/LaAlO3叉指电容器.利用X射线衍射仪、原子力显微镜和Aglient E4980LCR表分别对两种薄膜的结构、表面形貌和介电特性进行表征.研究发现:两种衬底都可以实现BST(001)薄膜的外延生长,MgO和LaAlO3衬底上BST薄膜的晶粒尺寸分别为52 nm和42 nm.在室温40 V偏置电压下,Pt/BST/MgO和Pt/BST/LaAlO3的调谐率分别为39.68%和29.55%,最低损耗分别为0.029和0.053.这说明衬底材料的晶格常数不同,最终导致了BST薄膜介电性能的不同.
参考文献
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