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    • 3. 发明授权
    • Method and apparatus for reducing OPC model errors
    • 减少OPC模型误差的方法和装置
    • US07325225B2
    • 2008-01-29
    • US11243933
    • 2005-10-05
    • Yasushi TanakaMasahiro InoharaMatthew Angyal
    • Yasushi TanakaMasahiro InoharaMatthew Angyal
    • G06F17/50
    • G03F1/36G03F1/68
    • It is important to assess and reduce errors that arise in mask correction techniques such as optical proximity correction. A preliminary mask is obtained using an OPC model. An etched wafer is created from the preliminary mask using lithography, and first and second critical dimensions (CD) are measured on the wafer and. An edge placement error (EPE) is determined that corresponds to a difference between a measured value and a desired value of the second CD. These steps are repeated for a plurality of different values of the first CD, and of for each of the values of, the measured value of the second CD is correlated with its corresponding value on the mask as predicted by the OPC model. Δ difference ΔCD is obtained between the difference of the mask CDs calculated by interpolation of wafer CD measurements and by OPC model predictions and is transformed into an OPC model error.
    • 重要的是评估和减少在诸如光学邻近校正的掩模校正技术中出现的错误。 使用OPC模型获得初步掩模。 使用光刻从初步掩模创建蚀刻的晶片,并且在晶片上测量第一和第二临界尺寸(CD)。 确定对应于测量值和第二CD的期望值之间的差的边缘放置误差(EPE)。 对于第一CD的多个不同值重复这些步骤,并且对于每个值,第二CD的测量值与由OPC模型预测的掩模上的对应值相关。 在通过晶片CD测量的插值和OPC模型预测计算出的掩模CD的差异之间获得差值DeltaCD,并将其转换为OPC模型误差。
    • 8. 发明申请
    • Method and apparatus for reducing OPC model errors
    • 减少OPC模型误差的方法和装置
    • US20070079278A1
    • 2007-04-05
    • US11243933
    • 2005-10-05
    • Yasushi TanakaMasahiro InoharaMatthew Angyal
    • Yasushi TanakaMasahiro InoharaMatthew Angyal
    • G06F17/50
    • G03F1/36G03F1/68
    • A method is provided of accessing model error in an optical proximity correction (OPC) model. The method begins by obtaining a preliminary mask using an OPC model, creating an etched wafer from the preliminary mask using lithography, and measuring a specified critical dimension (CD) on the wafer and a second CD on the wafer. An edge placement error (EPE) is determined that corresponds to a difference between a measured value of the second CD on the wafer and a desired value of the second CD on the wafer. The aforementioned steps are repeated for a plurality of different values of the specified CD to obtain an EPE for each of the different values of the specified CD. For each of the plurality of values of the specified CD, a measured value of a second CD on the wafer is correlated with a corresponding value of the second CD on the mask. For each of the plurality of values of the specified CD, the measured value of the second CD on the wafer is correlated with its corresponding value of the second CD on the mask as predicted by the OPC model. For each of the immediately preceding correlations that are obtained, and at a selected measured value of the second CD on the wafer, a difference Δ is obtained between the difference of the mask CDs calculated by interpolation of wafer CD measurements and by OPC model predictions. Each value of Δ is transformed into an OPC model error that each correspond to a particular value of the specified CD.
    • 提供了一种访问光学邻近校正(OPC)模型中的模型误差的方法。 该方法开始于使用OPC模型获得初步掩模,使用光刻从初步掩模创建蚀刻晶片,并测量晶片上的指定临界尺寸(CD)和晶片上的第二CD。 确定对应于晶片上的第二CD的测量值与晶片上的第二CD的期望值之间的差异的边缘放置误差(EPE)。 针对指定CD的多个不同值重复上述步骤,以获得指定CD的每个不同值的EPE。 对于指定CD的多个值中的每一个,晶片上的第二CD的测量值与掩模上的第二CD的相应值相关。 对于指定CD的多个值中的每一个,晶片上的第二CD的测量值与由OPC模型预测的掩模上的第二CD的对应值相关。 对于所获得的每个先前相关性,并且在晶片上的第二CD的选定测量值处,通过硅片CD测量的插值和通过OPC模型预测计算出的掩模CD的差异获得差值Delta。 Delta的每个值被转换成OPC模型错误,每个对应于指定CD的特定值。