Device manufacturing method and a calibration substrate
First Claim
1. A device manufacturing method comprising:
- measuring positions of global alignment marks present on a substrate having a front side and a back side, wherein said global alignment marks are positioned at the back side of said substrate;
defining a nominal grid on the front side of said substrate using said measured positions of said global alignment marks;
manufacturing a plurality of front side marks on the front side of the substrate;
measuring first positions of said respective front side marks with respect to said nominal grid, resulting in original positions of the respective front side marks;
executing at least one manufacturing step using said front side marks for alignment;
measuring second positions of said respective front side marks with respect to said nominal grid, resulting in actual positions of the respective front side marks; and
calculating measured position changes of said front side marks using said original positions and said actual positions.
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Abstract
The present invention relates to a device manufacturing method wherein a plurality of front side marks are manufactured on the front side of the substrate. These marks are used to locally align the substrate when exposing. After certain processing steps, the positions of the front side marks are measured and compared with respect to their original positions. The measured position changes of the front side marks, i.e. their behaviour, can then be analyzed. The original positions and actual positions are defined with respect to a nominal grid which is defined using global alignment marks which are positioned at the back side of the substrate. Because the global alignment marks are positioned at the back side, they are not affected by any processing step.
50 Citations
9 Claims
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1. A device manufacturing method comprising:
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measuring positions of global alignment marks present on a substrate having a front side and a back side, wherein said global alignment marks are positioned at the back side of said substrate;
defining a nominal grid on the front side of said substrate using said measured positions of said global alignment marks;
manufacturing a plurality of front side marks on the front side of the substrate;
measuring first positions of said respective front side marks with respect to said nominal grid, resulting in original positions of the respective front side marks;
executing at least one manufacturing step using said front side marks for alignment;
measuring second positions of said respective front side marks with respect to said nominal grid, resulting in actual positions of the respective front side marks; and
calculating measured position changes of said front side marks using said original positions and said actual positions. - View Dependent Claims (2, 3, 4)
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5. A method of manufacturing a calibration substrate, comprising:
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providing a transparent substrate;
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providing a mask layer on a front side of the transparent substrate;
patterning said mask layer to render a patterned mask layer on said front side of the transparent substrate;
providing a resist layer on a back side of the transparent substrate;
exposing said resist layer on said back side of the transparent substrate with light falling on said front side of the transparent substrate and transmitted by said transparent substrate to render an exposed resist layer; and
developing said exposed resist layer to render a patterned resist layer on said back side of the transparent substrate. - View Dependent Claims (6, 7, 8, 9)
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Specification