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    • 5. 发明授权
    • Method of overlay measurement, lithographic apparatus, inspection apparatus, processing apparatus and lithographic processing cell
    • 覆盖测量方法,光刻设备,检查设备,处理设备和光刻处理单元
    • US08767183B2
    • 2014-07-01
    • US12794192
    • 2010-06-04
    • Arie Jeffrey Den Boef
    • Arie Jeffrey Den Boef
    • G03B27/32G03F7/20G03F9/00
    • G03F7/70633G03F9/7046G03F9/7065G03F9/7088G03F9/7092
    • In order to improve overlay measurement, product marker gratings on a substrate are measured in a lithographic apparatus by an alignment sensor using scatterometry. Then information relating to the transverse profile of the product marker grating, such as its asymmetry, is determined from the measurement. After printing an overlay marker grating on a resist film, the lateral overlay of the overlay marker grating with respect to the product marker grating is measured by scatterometry and using the determined asymmetry information in combination with a suitable process model. The alignment sensor data may be used to first reconstruct the product grating and this information is fed forward to the scatterometer that measures the stack of product and resist grating and light scattered by the stack is used for reconstruction of a model of the stack to calculate overlay. The overlay may then, optionally, be fed back to the lithographic apparatus for correction of overlay errors.
    • 为了改善覆盖测量,通过使用散射测量的对准传感器在光刻设备中测量衬底上的产品标记光栅。 然后,从测量确定与产品标记光栅的横向轮廓相关的信息,例如其不对称性。 在抗蚀剂膜上印刷覆盖标记光栅之后,通过散射法测量覆盖标记光栅相对于产品标记光栅的横向覆盖,并且使用所确定的不对称信息与合适的工艺模型相结合。 对准传感器数据可以用于首先重建产品光栅,并且将该信息向前馈送到测量产品堆叠并抵抗光栅的散射仪,并且由堆叠散射的光用于重建堆叠的模型以计算叠加 。 然后,覆盖层可以可选地被反馈到光刻设备以校正重叠误差。