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    • 72. 发明申请
    • Apparatus and Method for Inspecting a Substrate
    • 用于检查基板的装置和方法
    • US20110255066A1
    • 2011-10-20
    • US12996211
    • 2009-06-04
    • Andreas FuchsMaurits Van Der Schaar
    • Andreas FuchsMaurits Van Der Schaar
    • G03B27/74G03B27/32G01B11/14
    • G03F7/70633
    • An apparatus measures properties, such as overlay error, of a substrate divided into a plurality of fields. The apparatus includes a radiation source configured to direct radiation onto a first target of each field of the substrate. Each first target (T4G) has at least a first grating and a second grating having respective predetermined offsets, the predetermined offset (+d) of the first grating being in a direction opposite the predetermined offset (−d) of the second grating. A detector is configured to detect the radiation reflected from each first target and to obtain an asymmetry value for each first target from the detected radiation. Further, a module is configured to determine an overlay value for each first target based on at least the obtained asymmetry value and the predetermined offsets and determine a polynomial fit across a plurality of first targets of a corresponding plurality of fields of the substrate for a relationship between the obtained asymmetry value and determined overlay value of each first target.
    • 一种装置测量分成多个场的衬底的性质,例如覆盖误差。 该装置包括被配置为将辐射引导到衬底的每个场的第一靶上的辐射源。 每个第一目标(T4G)具有至少第一光栅和具有相应预定偏移的第二光栅,第一光栅的预定偏移(+ d)在与第二光栅的预定偏移(-d)相反的方向上。 检测器被配置为检测从每个第一目标反射的辐射,并且从检测到的辐射获得每个第一目标的不对称值。 此外,模块被配置为基于至少所获得的不对称值和预定偏移来确定每个第一目标的覆盖值,并且确定跨越衬底的相应多个场的多个第一目标的多项式拟合,以获得关系 在获得的不对称值和确定的每个第一目标的覆盖值之间。