Reconfigurable lateral anionic heterostructures in oxide thin films via lithographically defined topochemistry
Reconfigurable lateral anionic heterostructures in oxide thin films via lithographically defined topochemistry
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DOI：
10.1103/physrevmaterials.3.073802
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发表时间：
2019-07-08
影响因子：
3.4
通讯作者：
May, Steven J.
中科院分区：
文献类型：
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作者：
Lefler, Benjamin M.;Duchon, Tomas;May, Steven J.
横向结构材料可展现出独特适用于电子学、磁电存储器、光子学和纳米离子学应用的特性。在此，提出了一种图案化方法，它将光刻技术实现的精确几何控制与复杂氧化物薄膜的局部化学阴离子操控相结合。利用氧化和氟化反应，制备了横向周期分别为200微米、20微米和4微米的SrFeO2.5/SrFeO3、SrFeO2.5/SrFeO2F和SrFeO3/SrFeO2F的条纹图案。通过X射线衍射、光学和光发射显微镜以及光谱学证实了不同化学相的共存。横向异质结构表现出高度各向异性的电子输运，并且还能通过可逆的氧化还原反应实现图案的瞬态变化和再生。这种方法可广泛应用于多种金属 - 氧化物体系，从而实现为特定的电子、光学、离子、热或磁功能量身定制的化学可重构横向异质结构。
Laterally structured materials can exhibit properties uniquely suited for applications in electronics, magnetoelectric memory, photonics, and nanoionics. Here, a patterning approach is presented that combines the precise geometric control enabled by lithography with topochemical anionic manipulation of complex oxide films. Utilizing oxidation and fluorination reactions, striped patterns of SrFeO2.5/SrFeO3, SrFeO2.5/SrFeO2F, and SrFeO3/SrFeO2F have been prepared with lateral periodicities of 200, 20, and 4 mu m. Coexistence of the distinct chemical phases is confirmed through x-ray diffraction, optical and photoemission microscopies, and optical spectroscopy. The lateral heterostructures exhibit highly anisotropic electronic transport and also enable transience and regeneration of patterns through reversible redox reactions. This approach can be broadly applied to a variety of metal-oxide systems, enabling chemically reconfigurable lateral heterostructures tailored for specific electronic, optical, ionic, thermal, or magnetic functionalities.