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    • 13. 发明授权
    • Multipurpose defect test structure with switchable voltage contrast capability and method of use
    • 具有可切换电压对比度的多用途缺陷测试结构和使用方法
    • US06297644B1
    • 2001-10-02
    • US09262240
    • 1999-03-04
    • Richard W. JarvisIraj EmamiJohn L. NistlerMichael G. McIntyre
    • Richard W. JarvisIraj EmamiJohn L. NistlerMichael G. McIntyre
    • H01H3102
    • G01R31/306G01R31/309
    • A test structure which includes alternating grounded and floating conductive lines may be used to test the formation of conductive features on an integrated circuit topography. During irradiation of the conductive lines from an electron source, the grounded conductive lines will appear darker than the floating conductive lines when the test structure is inspected. If a short occurs between the conductive lines, due to an extra material defect, the portion of the floating line in the vicinity of the defect will also appear darkened. If an open appears along a grounded line, the non-grounded portion of the grounded line will be glowing. The grounded conductive lines are preferably grounded through a depletion-mode transistor. By applying a voltage to the transistor, the grounded line may be disconnected from ground, allowing electrical testing of the test structure. The electrical testing may be used to validate the voltage contrast methodology, as well as determine the approximate size of defects formed on the test structure.
    • 包括交替接地和浮动导线的测试结构可用于测试集成电路形貌上的导电特征的形成。 在从电子源照射导线时,当检查结构时,接地的导线将比浮动导线显得更暗。 如果在导线之间发生短路,由于额外的材料缺陷,在缺陷附近的浮线部分也将变暗。 如果沿接地线路出现开路,接地线路的非接地部分将发光。 接地的导线优选通过耗尽型晶体管接地。 通过向晶体管施加电压,接地线可能与地断开,从而允许测试结构的电气测试。 电气测试可用于验证电压对比度方法,以及确定在测试结构上形成的缺陷的大致尺寸。