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摘要
光刻物镜是光刻机核心部件,其波像差大小决定着光刻机的分辨率和套刻精度。随着光刻机性能的逐步提升,光刻物镜波像差要求已经降低到0.5 nm (RMS)以下,这对波像差的检测是一个极大的挑战。现行的光刻物镜波像差检测方法(如哈特曼法,剪切干涉法和点衍射法等)的检测精度往往受限于其系统误差,而绝对检测技术是一种能够将系统误差分离出来的技术,最终突破精度极限。本文回顾了光刻物镜系统波像差检测方法和波前绝对检测技术,详细梳理了绝对检测技术在不同波像差检测方法中的应用和研究进展,重点总结了绝对检测技术在不同波像差检测方法中的技术难点,同时结合这些难点,展望了光刻物镜波像差绝对检测技术的未来发展趋势。
Abstract
The lithography objective is the core component of the lithography machine, and its wave aberration determines the resolution and overlay accuracy of the lithography machine. With the gradual improvement of the performance of the lithography machine, the wave aberration requirement of the lithography objective lens has been reduced to below 0.5 nm (RMS), which is a great challenge to the detection of the wave aberration. The detection accuracy of current lithography objective wave aberration detection methods (such as Hartmann method, shear interference method and point diffraction method, etc.) is often limited by its systematic error, and absolute detection technology is a method that can separate the systematic error. The technology that came out finally broke the limit of precision. This paper reviews the wave aberration detection method and surface absolute detection technology of lithography objective lens system, combs the application and research progress of absolute detection technology in wave aberration detection in detail, and summarizes the application of absolute detection technology in different wave aberration detection methods. At the same time, combined with these difficulties, the future development trend of the absolute detection technology of wave aberration of lithography objective lens is prospected.
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Key words:
- lithography objective system /
- optical test /
- wave aberration /
- absolute test
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Overview
Overview: The lithography objective lens system is the core component of the lithography machine, and the detection is the last process in the manufacture of the lithography objective lens system. The detection content includes the surface shape detection of a single lens and the wave aberration detection of the entire lithography objective lens system. In order to detect the surface shape of each surface of the lens, the wavefront is usually detected. The wave aberration of the lithography objective is a comprehensive reflection of the errors of each lens. It is necessary to detect the transmitted wavefront through all the lenses, which is related to the final accuracy of the lithography machine. Accurately detecting the wave aberration of the lithography objective lens system is conducive to improving the lithography processing accuracy of the lithography machine, and also plays an indispensable role in the development and manufacture of the lithography objective lens. As the working light wave becomes smaller, the precision needs to be improved to sub-nanometer precision, which has higher requirements for the detection of the wave aberration of the lithography objective. ASML, Cannon and Nikon hold a lot of technical secrets for lithography machine manufacturing and inspection, as does high-precision wave aberration inspection technology. We cannot know the high-precision detection technology of wave aberration proprietary to these companies, but absolute detection technology is a method that can effectively improve detection accuracy. The detection accuracy of current lithography objective wave aberration detection methods (such as Hartmann method, shear interference method and point diffraction method, etc.) is often limited by its systematic errors. The system error is separated, the wave aberration detection accuracy is further improved, and the accuracy limit is finally broken. Different wave aberration detection techniques are suitable for different absolute detection methods, but some other systematic error calibration ideas can be tried to develop new absolute detection techniques for lithography objective lenses. This paper reviews the wave aberration detection method and surface absolute detection technology of lithography objective lens system, combs the application and research progress of absolute detection technology in wave aberration detection in detail, and summarizes the application of absolute detection technology in different wave aberration detection methods. At the same time, combined with these difficulties, the future development trend of the absolute detection technology of wave aberration of lithography objective lens is prospected.
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表 1 物镜具体参数
Table 1. Objective lens specific parameters
物镜 NA 有效焦距/mm 入瞳直径 工作距离/mm A 0.14 40 11.2 mm/373pixels 34 B 0.65 4.5 5.9 mm/197pixels 0.6 C 0.9 1.8 3.3 mm/110pixels 1.0 表 2 不同物镜测试结果的相对RMS误差
Table 2. Relative RMS error of different objective lenses test results
物镜 最大/% 最小/% 平均/% A 18.6 8.5 13.9 B 21.4 8.9 16.4 C 23.3 13.7 19.7 表 3 不同旋转角度的检测精度
Table 3. Detection accuracy of different rotation angles
旋转角度/(°) PV/mλ RMS/mλ 90 29 3.2 135 42 7.7 180 57 12.3 表 4 四种不同光刻物镜波像差绝对检测对比
Table 4. Comparison of absolute detection of wave aberration of four different lithography objectives
采集图像数量 可实现性 精度 传统干涉法 双球面法 少 一般 一般 随机球法 多 复杂 低 基于哈特曼法的绝对检测 少 简单 一般 光栅横向剪切 旋转物镜法 较多 一般 较高 Talbot数法 少 简单 高 掩模标定法 少 复杂 高 基于点衍射的绝对检测 少 复杂 高 -
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