搜索

x
中国物理学会期刊

感应耦合等离子体刻蚀技术的工艺调控机理与研究进展

Mechanisms and research progress in process control of inductively coupled plasma etching: A review

PDF
导出引用
  • 随着半导体器件特征尺寸不断逼近原子尺度,感应耦合等离子体刻蚀技术因其在图案转移中的高精度优势而备受关注。传统依赖经验调参的工艺模式,由于对工艺参数、等离子体特性与刻蚀性能间复杂非线性耦合关系的系统认知不足,已难以满足该尺度下的极限精度需求。为此,本文将等离子体参数作为衔接工艺条件与刻蚀结果的中间桥梁,聚焦于感应耦合等离子体刻蚀中的能量沉积、粒子输运及表面反应等核心物理过程,系统回顾了感性耦合源的结构与驱动特性、反应腔室与电介质窗构型以及射频偏压调控的研究进展,进而揭示了这些因素对刻蚀速率、均匀性、各向异性及选择比等关键性能的影响机制。在此基础上,本文探讨了双频驱动、脉冲调制等先进驱动方式在拓展工艺窗口与抑制等离子体损伤方面的潜在优势,并综述了人工智能技术在跨尺度建模、诊断数据融合及工艺智能预测等前沿方向的新进展。最后,文章展望了面向未来微纳制造需求的感应耦合等离子体刻蚀技术的发展趋势。

     

    Inductively coupled plasma etching technology, as a fundamental process in semiconductor manufacturing, requires precise control of etching equipment to enhance process performance. However, a central challenge in this technology lies in the nonlinear and multiscale coupling effects among process parameters, plasma characteristics, and etching responses, which severely limits the effectiveness of conventional experience-driven process optimization. Focusing on key physical processes in inductively coupled plasma etching (such as energy deposition, particle transport, and plasma-surface interactions), this review systematically summarizes recent progress by treating plasma parameters as the intermediate variables linking process conditions to etching outcomes. To establish a theoretical basis for understanding plasma control mechanisms, this paper first introduces the fundamental principles of inductively coupled plasma discharge, along with the corresponding physical modeling and experimental diagnostic methods. Subsequently, the article reviews key research advances in recent years from three perspectives: the inductively coupled plasma antenna configuration and its driving signals, etching chamber design, and radio frequency bias sources. Specifically, the cross-section, shape, and structural layout of the antenna directly affect radio frequency power coupling and thus the spatial distribution of the induced electromagnetic field; the driving parameters of the inductively coupled plasma source (e.g., power, frequency, voltage/current amplitude) exert significant control over plasma characteristics including electron density, electron temperature, and spatial distribution; meanwhile, advanced driving modes such as pulsed power modulation and dual-frequency driving have been demonstrated to further enhance plasma uniformity and mitigate surface-induced damage. As the core region of plasma reactions, the aspect ratio of the etching chamber considerably affects plasma transport behavior. Moreover, the dielectric window—mounted on the top or sidewall of the chamber—exerts a significant influence on the spatial distribution and characteristic parameters of the plasma, which is attributed to its material properties, spacing relative to the antenna, and the configuration of the chamber’s pumping system (a key factor regulating plasma pressure and residence time). On the substrate side, the application of an external radio frequency bias source enables independent control of plasma density and ion bombardment energy, where variations in bias parameters induce dynamic responses in etching behavior. Collectively, this review summarizes how these critical hardware configurations and process parameters regulate plasma properties, thereby elucidating the inherent correlation between process conditions and key etching performance metrics (i.e., etch rate, uniformity, anisotropy, and selectivity). Beyond these conventional optimization approaches, it also highlights innovative applications of artificial intelligence in low-temperature plasma diagnostics, cross-scale modeling, and intelligent process control. Finally, future development directions for inductively coupled plasma etching technology catering to the requirements of sub-nanometer fabrication are presented.

     

    目录

    /

    返回文章
    返回