Control of High Quality SrVO3 Electrode in Oxidizing Atmosphere
Control of High Quality SrVO3 Electrode in Oxidizing Atmosphere
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DOI：
10.1002/admi.201600274
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发表时间：
2016-09-20
影响因子：
5.4
通讯作者：
Fouchet, Arnaud
中科院分区：
文献类型：
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作者：
Berini, Bruno;Demange, Valerie;Fouchet, Arnaud
SrVO3 (SVO) 是强相关氧化物的模型系统，非常有希望作为异质结构中的导电层。因此，电子性能和形貌的控制对于先进应用至关重要。在这里，我们探讨了沉积过程中和沉积后的氧稳定性，因为 SVO 薄膜在集成到异质结构期间预计会经历不同的沉积后热处理和气氛处理。因此，研究了氧稳定性对脉冲激光沉积生长的金属 SrVO3 的形貌和电性能的影响。在真空下生长的薄膜 (SrVO3-d) 表现出非常光滑的表面，而在较高氧压下生长的薄膜则变得粗糙并在表面呈现纳米结构。这些纳米结构被发现是Sr3V2O8相，它们的出现可以通过氧气供应来控制。随后在相同氧压下不同温度下的热处理可防止Sr3V2O8相的形成，产生化学计量的SrVO3，从而改善输运性能。本研究展示了 SVO 对氧的极端敏感性以及获得高质量光滑 SVO 薄膜的条件，该薄膜具有改善的电极应用电性能。
SrVO3 (SVO) is a model system for strongly correlated oxides and is highly promising as conductive layer in heterostructures. Therefore, the control of electronic properties and morphology are essential for the advanced applications. Here, the oxygen stability during and after the deposition is explored, as SVO film is expected to undergo different postdeposition thermal and atmosphere treatments during its integration in a heterostructure. Hence, the influence of oxygen stability on morphology and electrical properties of the metallic SrVO3 grown by pulsed laser deposition has been investigated. Films grown under vacuum (SrVO3-d) exhibit a very smooth surface while films grown under higher oxygen pressure roughen and present nanostructures at the surface. These nanostructures are found to be of Sr3V2O8 phase and their apparition can be controlled by the oxygen supply. Subsequent thermal treatments at different temperatures under same oxygen pressure prevent formation of the Sr3V2O8 phase, lead to the stoichiometric SrVO3, and thus improve the transport properties. In this study is shown the extreme sensitivity of SVO to oxygen and the conditions to obtain high quality smooth SVO films with improved electrical properties for electrode application.