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    • 2. 发明申请
    • Substrate for Use in Metrology, Metrology Method and Device Manufacturing Method
    • 用于计量,计量方法和设备制造方法的基板
    • US20120044470A1
    • 2012-02-23
    • US13190998
    • 2011-07-26
    • Hendrik Jan Hidde SMILDEMaurits Van Der SchaarKaustuve Bhattacharyya
    • Hendrik Jan Hidde SMILDEMaurits Van Der SchaarKaustuve Bhattacharyya
    • G03B27/42G01N21/00
    • G03F7/70683G03F1/44G03F7/70633
    • A pattern from a patterning device is applied to a substrate. The applied pattern includes device functional areas and metrology target areas. Each metrology target area comprises a plurality of individual grating portions, which are used for diffraction based overlay measurements or other diffraction based measurements. The gratings are of the small target type, which is small than an illumination spot used in the metrology. Each grating has an aspect ratio substantially greater than 1, meaning that a length in a direction perpendicular to the grating lines which is substantially greater than a width of the grating. Total target area can be reduced without loss of performance in the diffraction based metrology. A composite target can comprise a plurality of individual grating portions of different overlay biases. Using integer aspect ratios such as 2:1 or 4:1, grating portions of different directions can be packed efficiently into rectangular composite target areas.
    • 将来自图案形成装置的图案应用于基板。 应用模式包括设备功能区域和计量目标区域。 每个测量目标区域包括多个单独的光栅部分,其用于基于衍射的覆盖测量或其他基于衍射的测量。 光栅是小目标类型,小于计量中使用的照明点。 每个光栅具有基本上大于1的长宽比,这意味着在垂直于光栅线的方向上的长度大致大于光栅的宽度。 可以减少总目标面积,而不会在基于衍射的计量学中失去性能。 复合目标可以包括不同覆盖偏移的多个单独光栅部分。 使用诸如2:1或4:1的整数长宽比,可以将不同方向的光栅部分有效地包装到矩形复合目标区域中。