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arXiv 2406.04729cond-mat.mtrl-sci
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基于单靶溅射的Fe$_2$VAl基薄膜热电材料迭代成分优化

Iterative composition optimization in Fe$_2$VAl-based thin-film thermoelectrics using single-target sputtering

Alexander Riss, Ellena Lasisch, Simon Podbelsek, Katharina Schäfer, Michael Parzer, Fabian Garmroudi, Christoph Eisenmenger-Sittner, Takao Mori, Ernst Bauer

AI总结:

本文提出通过使用偏离化学计量比的靶材并结合迭代优化,在单靶磁控溅射中实现Fe$_2$VAl基薄膜的精确成分控制,无需先进溅射装置。

摘要:

磁控溅射固有地具有以与靶材化学计量比相同的比例从靶材上剥离粒子的优势。然而,由于元素与工作气体之间的散射依赖于元素种类,薄膜成分常常发生偏离,因此需要调整溅射工艺。在这项工作中,我们探索了一种解决该问题的非常规方法,即使用偏离化学计量比的靶材。所需成分通过迭代过程获得,并以Fe$_2$VAl和Fe$_2$V$_{0.9}$Ti$_{0.1}$Al薄膜作为案例进行了演示。最终,分别从Fe$_{1.86}$V$_{1.15}$Al$_{0.99}$和Fe$_{1.88}$V$_{1.02}$Ti$_{0.13}$Al$_{0.97}$靶材获得了正确的化学计量比。尽管由于薄膜结晶不完善,热电性能低于预期,但该策略成功实现了所需的化学计量比,从而无需先进的溅射装置即可实现精确的薄膜合成。

英文摘要:

Magnetron sputtering inherently exhibits the advantage of dislodging particles from the target in a ratio equivalent to the target stoichiometry. Nevertheless, film compositions often deviate due to element-dependent scattering with the working gas, necessitating the adjustment of the sputtering process. In this work, we explore an unconventional approach of addressing this issue, involving the employment of an off-stoichiometric target. The required composition is obtained through an iterative process, which is demonstrated by Fe$_2$VAl and Fe$_2$V$_{0.9}$Ti$_{0.1}$Al films as case studies. Ultimately, the correct stoichiometry is obtained from Fe$_{1.86}$V$_{1.15}$Al$_{0.99}$ and Fe$_{1.88}$V$_{1.02}$Ti$_{0.13}$Al$_{0.97}$ targets, respectively. Despite the thermoelectric properties falling below expectations, mainly due to imperfect film crystallization, the strategy successfully achieved the desired stoichiometry, enabling accurate film synthesis without the need of advanced sputtering setups.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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