非均相磁场对低压电容耦合氮等离子体影响的空间分辨光谱研究

IF 2.4 4区 物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
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引用次数: 0

摘要

虽然磁化等离子体已被广泛用于半导体工艺中,通过控制离子流量、能量和等离子体密度来提高工艺速率或改善薄膜质量,但导致等离子体不均匀的不均匀磁场仍然是一个有待解决的问题。要解决这个问题,必须对整个放电过程中的磁效应进行全面评估。因此,在本研究中,我们基于光谱分析研究了磁场效应(B < 100 G)对电容耦合氮等离子体的影响。在有磁场和无磁场的 10 mTorr 和 250 mTorr 压力下,沿径向在不同垂直位置测量了空间分辨发射光谱。通过分析 N2 FPS、N2 SPS、N2+ FNS 和 N I 等发射光谱,我们获得了反应物密度、振动温度和激发温度的径向分布。在低压等离子体中,施加磁场后,在磁体下方的体积区域内观察到振动温度和激发温度的最大升高分别为 462 K 和 491 K。这种磁效应导致反应物密度沿径向显著增加。研究还发现,磁场对离子密度的局部增强与激发温度和 N2+(B)态密度的增加密切相关。这一结果表明,引入不对称磁场可以调节等离子体物理和化学特性的空间分布。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Spatially-resolved spectroscopic investigation of the inhomogeneous magnetic field effects on a low-pressure capacitively-coupled nitrogen plasma

Spatially-resolved spectroscopic investigation of the inhomogeneous magnetic field effects on a low-pressure capacitively-coupled nitrogen plasma
Although magnetized plasmas have been frequently used to enhance the process rate or improve the film quality via the control of ion flux as well as energy and plasma density in semiconductor processes, the inhomogeneous magnetic field—which leads to plasma non-uniformity—remains as a problem to be solved. To address this problem, it is essential to conduct a comprehensive assessment of the magnetic effect throughout the entire discharge. Therefore, in the present study, we investigated the magnetic field effects (B < 100 G) on a capacitively-coupled nitrogen plasma based on spectroscopic analyses. The spatially-resolved emission spectra were measured along the radial direction at various vertical positions under the pressures of 10 mTorr and 250 mTorr both with and without magnetic field. By analyzing emission spectra such as N2 FPS, N2 SPS, N2+ FNS, and N I, we were able to obtain the radial distributions of reactive species density, vibrational temperature, and excitation temperature. In low-pressure plasma, with the application of a magnetic field, maximum increases in vibrational temperature and excitation temperature of 462 K and 491 K, respectively, were observed within the bulk region beneath the magnet. This magnetic effect resulted in a significant increase in reactive species density along the radial direction. It was also found that the local enhancement of ion density by magnetic field was strongly related to the increase in excitation temperature and the density of the N2+(B) state. From this result, it is suggested that introducing an asymmetric magnetic field could modulate the spatial distributions of the physical and chemical properties of the plasma.
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来源期刊
Current Applied Physics
Current Applied Physics 物理-材料科学:综合
CiteScore
4.80
自引率
0.00%
发文量
213
审稿时长
33 days
期刊介绍: Current Applied Physics (Curr. Appl. Phys.) is a monthly published international journal covering all the fields of applied science investigating the physics of the advanced materials for future applications. Other areas covered: Experimental and theoretical aspects of advanced materials and devices dealing with synthesis or structural chemistry, physical and electronic properties, photonics, engineering applications, and uniquely pertinent measurement or analytical techniques. Current Applied Physics, published since 2001, covers physics, chemistry and materials science, including bio-materials, with their engineering aspects. It is a truly interdisciplinary journal opening a forum for scientists of all related fields, a unique point of the journal discriminating it from other worldwide and/or Pacific Rim applied physics journals. Regular research papers, letters and review articles with contents meeting the scope of the journal will be considered for publication after peer review. The Journal is owned by the Korean Physical Society.
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