Measuring phase errors on phase shift masks
    6.
    发明授权
    Measuring phase errors on phase shift masks 失效
    在相移掩模上测量相位误差

    公开(公告)号:US07368208B1

    公开(公告)日:2008-05-06

    申请号:US11440562

    申请日:2006-05-24

    IPC分类号: G03F9/00 G03C5/00 H01L23/544

    摘要: Methods and apparatus for producing a semiconductor. A production reticle having a pattern that includes circuit features, phase shift target structures and overlay target structures is provided. The pattern is transferred multiple times across a test wafer surface for various focus levels to form a focus matrix. The pattern shift of the phase shift target structures is measured using an overlay metrology tool. The phase difference is calculated for each phase shift target structure, based on the pattern shift and the phase shift target structure focus level to qualify the phase difference of the production reticle. The pattern is transferred onto a production wafer when the phase difference meets desired limits. The pattern shift of the overlay target structures transferred to the production wafer is measured using an overlay metrology tool. The pattern placement error of the overlay target structures is calculated and the pattern placement error is qualified.

    摘要翻译: 用于制造半导体的方法和装置。 提供具有包括电路特征,相移目标结构和覆盖目标结构的图案的制作掩模版。 该图案在测试晶片表面上被多次转移以用于各种聚焦水平以形成焦点矩阵。 使用覆盖计量工具测量相移目标结构的图案偏移。 基于图案偏移和相移目标结构焦点水平来计算每个相移目标结构的相位差,以限制制作掩模版的相位差。 当相位差达到预期限度时,将图案转移到生产晶片上。 使用覆盖计量工具测量转移到生产晶片的覆盖目标结构的图案偏移。 计算覆盖目标结构的图案放置误差,并对图案放置错误进行限定。

    Use of overlay diagnostics for enhanced automatic process control
    9.
    发明授权
    Use of overlay diagnostics for enhanced automatic process control 有权
    使用覆盖诊断功能进行增强的自动过程控制

    公开(公告)号:US07111256B2

    公开(公告)日:2006-09-19

    申请号:US10438963

    申请日:2003-05-14

    IPC分类号: G06F17/50

    摘要: Disclosed are methods and apparatus for analyzing the quality of overlay targets. In one embodiment, a method of extracting data from an overlay target is disclosed. Initially, image information or one or more intensity signals of the overlay target are provided. An overlay error is obtained from the overlay target by analyzing the image information or the intensity signal(s) of the overlay target. A systematic error metric is also obtained from the overlay target by analyzing the image information or the intensity signal(s) of the overlay target. For example, the systematic error may indicate an asymmetry metric for one or more portions of the overlay target. A noise metric is further obtained from the overlay target by applying a statistical model to the image information or the intensity signal(s) of the overlay target. Noise metric characterizes noise, such as a grainy background, associated with the overlay target. In other embodiments, an overlay and/or stepper analysis procedure is then performed based on the systematic error metric and/or the noise metric, as well as the overlay data.

    摘要翻译: 公开了分析覆盖目标质量的方法和装置。 在一个实施例中,公开了一种从覆盖目标提取数据的方法。 首先,提供覆盖目标的图像信息或一个或多个强度信号。 通过分析覆盖目标的图像信息或强度信号,从覆盖目标获得重叠错误。 通过分析覆盖目标的图像信息或强度信号也可以从覆盖目标获得系统误差度量。 例如,系统误差可以指示覆盖目标的一个或多个部分的不对称度量。 通过将统计模型应用于覆盖目标的图像信息或强度信号,从覆盖目标进一步获得噪声度量。 噪声度量表示与覆盖目标相关联的噪声,例如粒状背景。 在其他实施例中,然后基于系统误差度量和/或噪声度量以及覆盖数据来执行覆盖和/或步进分析程序。

    Use of overlay diagnostics for enhanced automatic process control
    10.
    发明授权
    Use of overlay diagnostics for enhanced automatic process control 有权
    使用覆盖诊断功能进行增强的自动过程控制

    公开(公告)号:US06928628B2

    公开(公告)日:2005-08-09

    申请号:US10438962

    申请日:2003-05-14

    摘要: Disclosed are methods and apparatus for analyzing the quality of overlay targets. In one embodiment, a method of extracting data from an overlay target is disclosed. Initially, image information or one or more intensity signals of the overlay target are provided. An overlay error is obtained from the overlay target by analyzing the image information or the intensity signal(s) of the overlay target. A systematic error metric is also obtained from the overlay target by analyzing the image information or the intensity signal(s) of the overlay target. For example, the systematic error may indicate an asymmetry metric for one or more portions of the overlay target. A noise metric is further obtained from the overlay target by applying a statistical model to the image information or the intensity signal(s) of the overlay target. Noise metric characterizes noise, such as a grainy background, associated with the overlay target. In other embodiments, an overlay and/or stepper analysis procedure is then performed based on the systematic error metric and/or the noise metric, as well as the overlay data.

    摘要翻译: 公开了分析覆盖目标质量的方法和装置。 在一个实施例中,公开了一种从覆盖目标提取数据的方法。 首先,提供覆盖目标的图像信息或一个或多个强度信号。 通过分析覆盖目标的图像信息或强度信号,从覆盖目标获得重叠错误。 通过分析覆盖目标的图像信息或强度信号也可以从覆盖目标获得系统误差度量。 例如,系统误差可以指示覆盖目标的一个或多个部分的不对称度量。 通过将统计模型应用于覆盖目标的图像信息或强度信号,从覆盖目标进一步获得噪声度量。 噪声度量表示与覆盖目标相关联的噪声,例如粒状背景。 在其他实施例中,然后基于系统误差度量和/或噪声度量以及覆盖数据来执行覆盖和/或步进分析程序。