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    • 1. 发明申请
    • CONFOCAL SECONDARY ELECTRON IMAGING
    • CONFOCAL二次电子图像
    • WO2008027543A2
    • 2008-03-06
    • PCT/US2007/019188
    • 2007-08-29
    • KLA-TENCOR TECHNOLOGIES CORPORATIONADLER, David L
    • ADLER, David L
    • G01N23/225
    • G01N23/225H01J37/256H01J37/28H01J2237/2803
    • One embodiment relates to an apparatus using electrons for inspection or metrology of a semiconductor substrate. The apparatus includes an electron source (301), electron lenses (302), scan deflectors (304), an objective electron lens (305), a collection electron lens (310), a pin-hole filter (312), de-scan deflectors (311), and a detector (313). The collection electron lens (310) is configured to focus the secondary electrons so as to form a secondary electron beam (309) which is focused at a conjugate focal plane, and the pin-hole filter (312) is positioned at the conjugate focal plane. The de-scan deflectors (311) are configured to controllably deflect the secondary electrons so as to counteract an influence of the scan deflectors (304) such that a center portion of the secondary electron beam passes through the filter and a remainder portion of the secondary electron beam is filtered out by the filter. Other embodiments and features are also disclosed.
    • 一个实施例涉及使用电子来检查或计量半导体衬底的设备。 该装置包括电子源(301),电子透镜(302),扫描偏转器(304),物镜电子透镜(305),收集电子透镜(310),针孔滤波器(312),去扫描 偏转器(311)和检测器(313)。 集光电子透镜(310)被配置为聚焦二次电子以形成聚焦在共轭焦平面处的二次电子束(309),并且针孔滤光器(312)被定位在共轭焦平面 。 去扫描偏转器(311)被配置为可控制地偏转二次电子,从而抵消扫描偏转器(304)的影响,使得二次电子束的中心部分穿过滤波器,而次级电子束的剩余部分 电子束被滤波器滤除。 其他实施例和特征也被公开。