Domain formation in anatase TiO2 thin films on LaAlO3 substrates
Domain formation in anatase TiO2 thin films on LaAlO3 substrates
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DOI：
10.1063/1.4766338
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发表时间：
2012-11
影响因子：
4
通讯作者：
Shijian Zheng;C. Fisher;T. Kato;Y. Nagao;H. Ohta;Y. Ikuhara
中科院分区：
文献类型：
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作者：
Shijian Zheng;C. Fisher;T. Kato;Y. Nagao;H. Ohta;Y. Ikuhara
利用先进的铯校正扫描透射电子显微镜，我们观察到的原子结构的相干TiO 2/LaAlO 3异质界面的TiO 2薄膜沉积在单晶LaAlO 3。确定了两种外延关系：（001）[100] TiO 2//（001）[100] LaAlO 3和（001）[010] TiO 2//（001）[100] LaAlO 3。这些外延关系和衬底表面的平台台阶导致了TiO 2薄膜中多畴的形成。识别出三种类型的域边界，即90°旋转域边界、平移域边界以及两者的混合。这些域边界预期对薄膜的性质具有深远的影响。
Using advanced Cs-corrected scanning transmission electron microscopy, we have observed the atomic structures of coherent TiO2/LaAlO3 heterointerfaces in anatase TiO2 thin films deposited on single-crystal LaAlO3. Two epitaxial relationships are identified: (001)[100] TiO2//(001)[100] LaAlO3 and (001)[010] TiO2//(001)[100] LaAlO3. These epitaxial relationships and the terrace steps on the substrate surface result in the formation of multidomains in the anatase TiO2 thin films. Three types of domain boundaries are identified, namely, 90° rotation domain boundaries, translation domain boundaries, and mixtures of the two. These domain boundaries are expected to have a profound effect on the properties of the thin film.