Abstract:
An exposure method is described, the method comprising the steps of a) transferring a first pattern onto each of a plurality of target portions of a substrate, the first pattern including at least one alignment mark; b) measuring a position of a plurality of alignment marks and determining an alignment mark displacement (dx, dy) for each of the plurality of alignment marks as a difference between a respective predetermined nominal position of the alignment mark and the respective measured position of the alignment mark; c) fitting a mathematical model to the plurality of alignment mark displacements to obtain a fitted mathematical model, d) determining a position of the first pattern in each of the plurality of target portions, based on the fitted mathematical model; e) transferring a second pattern onto each of the plurality of target portions, using the determined position of the first pattern in each of the plurality of target portions, wherein the mathematical model comprises polynomials Z1 and Z2: Z1 = r 2 cos(2 θ ) Z2 = r 2 sin(2 θ ) in polar coordinates (r, θ) or Z1 = x 2 - y Z 2= xy in Cartesian coordinates (x, y).
Abstract translation:描述了一种曝光方法,所述方法包括以下步骤:a)将第一图案转印到基板的多个目标部分中的每一个上,所述第一图案包括至少一个对准标记; b)测量多个对准标记的位置,并确定多个对准标记中的每一个的对准标记位移(dx,dy),作为对准标记的相应预定标称位置与相应测量位置之间的差 对准标记 c)将数学模型拟合到所述多个对准标记位移以获得拟合的数学模型,d)基于所拟合的数学模型确定所述多个目标部分中的每一个中的所述第一图案的位置; e)使用所述多个目标部分中的每一个中的所述第一图案的确定位置将第二图案转移到所述多个目标部分中的每一个上,其中所述数学模型包括多项式Z1和Z2:Z1 = r 2 cos(2θ) Z2 = r 2 sin(2θ)极坐标(r,θ)或Z1 = x 2 -y Z 2 = xy在笛卡尔坐标(x,y)。
Abstract:
A lithographic apparatus comprises an illumination system configured to condition a radiation beam, a support to support a patterning device, a substrate table to hold a substrate; and a projection system to project the patterned radiation beam onto a target portion of the substrate. The support is provided with a transparent layer to protect the pattering device. The apparatus further comprises a transparent layer deformation-determining device to determine a deformation profile of the transparent layer, the deformation profile of the transparent layer expressing a deformation of the transparent layer during a scanning movement of the lithographic apparatus, a compensator device which is configured to control at least one of the projection system, the substrate table and the support in response to the deformation profile of the transparent layer to compensate for the deformation of the transparent layer during the scanning movement of the apparatus.
Abstract:
Disclosed is an apparatus and method for performing a measurement operation on a substrate in accordance with one or more wafer alignment models. The one or more wafer alignment models are selected from a plurality of candidate wafer alignment models. The apparatus, which may be a lithographic apparatus, comprises an external interface which enables selection of the wafer alignment model(s) and/or alteration of the wafer alignment model(s) prior to said measurement operation.
Abstract:
A method including determining a position of a first pattern in each of a plurality of target portions on a substrate, based on a fitted mathematical model, wherein the first pattern includes at least one alignment mark, wherein the mathematical model is fitted to a plurality of alignment mark displacements (dx, dy) for the alignment marks in the target portions, and wherein the alignment mark displacements are a difference between a respective nominal position of the alignment mark and measured position of the alignment mark; and transferring a second pattern onto each of the target portions, using the determined position of the first pattern in each of the plurality of target portions, wherein the mathematical model includes polynomials Z1 and Z2: Z1=r2 cos(2θ) and Z2=r2 sin(2θ) in polar coordinates (r, θ) or Z1=x2−y2 and Z2=xy in Cartesian coordinates (x, y).