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    • 10. 发明授权
    • Method of endpoint detection of plasma etching process using multivariate analysis
    • 使用多变量分析的等离子体蚀刻工艺的端点检测方法
    • US09330990B2
    • 2016-05-03
    • US14056059
    • 2013-10-17
    • TOKYO ELECTRON LIMITED
    • Yan ChenSerguei KomarovVi Vuong
    • G01L21/30G01R31/00H01L21/66H01J37/32G06F17/16H01L21/67
    • H01L22/26G06F17/16H01J37/32963H01L21/3065H01L21/67069
    • Disclosed is a method for determining an endpoint of an etch process using optical emission spectroscopy (OES) data as an input. Optical emission spectroscopy (OES) data are acquired by a spectrometer attached to a plasma etch processing tool. The acquired time-evolving spectral data are first filtered and demeaned, and thereafter transformed into transformed spectral data, or trends, using multivariate analysis such as principal components analysis, in which previously calculated principal component weights are used to accomplish the transform. A functional form incorporating multiple trends may be used to more precisely determine the endpoint of an etch process. A method for calculating principal component weights prior to actual etching, based on OES data collected from previous etch processing, is disclosed, which method facilitates rapid calculation of trends and functional forms involving multiple trends, for efficient and accurate in-line determination of etch process endpoint.
    • 公开了一种使用光发射光谱(OES)数据作为输入来确定蚀刻工艺的端点的方法。 光发射光谱(OES)数据通过附着在等离子体蚀刻处理工具上的光谱仪获得。 首先将所获取的时间演变的光谱数据进行滤波并分析,然后使用多元分析(如主成分分析)将其转换为变换的光谱数据或趋势,其中先前计算的主成分权重用于完成变换。 可以使用包含多个趋势的功能形式来更准确地确定蚀刻工艺的终点。 公开了一种基于从先前蚀刻处理收集的OES数据计算实际蚀刻之前的主要分量权重的方法,该方法有助于快速计算涉及多个趋势的趋势和功能形式,以有效和准确地在线确定蚀刻过程 端点。