In situ study through electrical resistance of growth rate of trifluoroacetate-based solution-derived YBa2Cu3O7 films
In situ study through electrical resistance of growth rate of trifluoroacetate-based solution-derived YBa2Cu3O7 films
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DOI：
10.1088/0953-2048/28/2/024006
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发表时间：
2015-01
影响因子：
3.6
通讯作者：
C. F. Sánchez-Valdés;T. Puig;X. Obradors
中科院分区：
文献类型：
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作者：
C. F. Sánchez-Valdés;T. Puig;X. Obradors
本文采用原位电学测量方法，研究了以金属有机三氟乙酸盐（TFA）为前驱物，采用化学溶液沉积法制备的YBa_2Cu_3O_（6 +δ）（YBCO）超导薄膜的成核、生长和烧结过程。在这项研究中使用的单晶基板（LaAlO 3和CeO 2/YSZ）。在不同温度下，对膜的原位电阻的等温时间依赖性的分析允许证明生长速率G是强烈的温度依赖性，即当从700 ° C到810 °C时，G被增强了1/15。此外，我们表明，添加Ag-TFA在溶液中可以提高生长速率高达50%，相比纯YBCO，从而证实了先前的评估的强烈影响银掺杂YBCO薄膜的生长和微观结构。原位电阻测量结果表明，以及存在的孵化时间，我们推断其温度依赖性的起源。最后，热力学分析允许提出一个单一的方程的YBCO薄膜的生长速率集成所有相关的工艺参数。我们的分析验证了固-气反应-扩散模型描述的TFA前驱体的YBCO薄膜的生长，从而扩大了所需的知识，以提高控制的微观结构和超导性能的溶液衍生的YBCO薄膜。
In this work, we have studied by means of in situ electrical measurements the nucleation, growth and sintering stages of epitaxial YBa2Cu3O6+δ (YBCO) superconducting thin films prepared using a chemical solution deposition approach based on metal-organic trifluoroacetate-based (TFA) precursors. Single crystal substrates (LaAlO3 and CeO2/YSZ) were used in this study. Analysis of isothermal time dependences, at different temperatures, of in situ electrical resistance of films allowed to evidence that the growth rate G is strongly temperature dependent, i.e. G is enhanced by a factor ∼15 when going from 700 to 810 °C. Additionally, we demonstrate that adding Ag-TFA in the solution may enhance the growth rate by as much as 50%, as compared to pure YBCO, thus confirming previous assessments of the strong influence of Ag doping on YBCO film growth and microstructure. In situ electrical resistance measurements show as well that an incubation time exists and we infer the origin of its temperature dependence. Finally, a thermodynamic analysis allows proposing a single equation for the growth rate of YBCO films integrating all the relevant processing parameters. Our analysis has validated the solid-gas reaction-diffusion model describing the growth of YBCO films from TFA precursors and thus enlarges the knowledge required to enhance the control of the microstructure and superconducting properties of solution-derived YBCO films.