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    • 5. 发明授权
    • Method and apparatus for inspecting integrated circuit pattern using a plurality of charged particle beams
    • 使用多个带电粒子束检查集成电路图案的方法和装置
    • US06476390B1
    • 2002-11-05
    • US09646281
    • 2000-09-15
    • Hisaya MurakoshiYusuke YajimaHiroyuki ShinadaMari NozoeAtsuko TakafujiKaoru UmemuraMasaki HasegawaKatsuhiro Kuroda
    • Hisaya MurakoshiYusuke YajimaHiroyuki ShinadaMari NozoeAtsuko TakafujiKaoru UmemuraMasaki HasegawaKatsuhiro Kuroda
    • G01N2300
    • H01J37/28G01N23/225G01N23/2255H01J2237/16H01J2237/18H01J2237/2817H01L22/12H01L2924/0002H01L2924/00
    • In a pattern inspection device of the present invention having at least three electron-optical systems, detection signals approximately simultaneously obtained from identical circuit patterns are compared with each other. Further, areas around plural electron sources can be maintained at high degrees of vacuum by evacuating an electron gun chamber mounted with plural electron guns independently of a sample chamber. Further, electric fields and magnetic fields are confined in each electron-optical system by a shield electrode which makes it possible to evacuate an electron beam path to a high degree of vacuum, and at the same time, secondary electrons and reflected electrons are detected in the same electron-optical system by setting the samples to a negative voltage and accelerating secondary electrons and reflected electrons toward the electron source side in the direction of the electron beam axis. Thus, defect determination in pattern inspection is performable substantially simultaneously, and at the same time, the throughput of the inspections is improvable in proportion to the number of the electron-optical systems. Further, three or more electron sources are operable in a stable manner in high vacuum states, and signals from closely arranged electron-optical systems are detectable with high accuracy, and accurate inspections are performable.
    • 在具有至少三个电子 - 光学系统的本发明的图案检查装置中,将从相同电路图形大致同时获得的检测信号彼此进行比较。 此外,通过与安装有多个电子枪的电子枪室独立于样品室排出,可以将多个电子源周围的区域保持在高真空度。 此外,通过屏蔽电极将电场和磁场限制在每个电子 - 光学系统中,该屏蔽电极使得可以将电子束路径排出到高真空度,同时二次电子和反射电子被检测到 相同的电子 - 光学系统通过将样品设置为负电压并且在电子束轴的方向上将二次电子和反射电子加速朝向电子源侧。 因此,图案检查中的缺陷确定可以基本上同时执行,并且同时,检查的吞吐量可以与电子 - 光学系统的数量成比例地改善。 此外,三个或更多个电子源可以以高真空状态稳定地操作,并且来自紧密排列的电子 - 光学系统的信号可以高精度地检测,并且可以进行准确的检查。