Lithographic projection mask, device manufacturing method, and device manufactured thereby
First Claim
Patent Images
1. A device manufacturing method comprising:
- projecting a first image onto a first target portion of a radiation-sensitive material that at least partially covers a substrate, the first image including a first device pattern and at least a first reference mark located within the first device pattern;
projecting a second image, including a second device pattern and at least a second reference mark, onto a second target portion of the radiation-sensitive material; and
determining a relative placement of the first image and the second image based on a relative position of the first reference mark and the second reference mark, wherein the first reference mark and the second reference mark are not superposed, and wherein the first image and the second image include two reference marks positioned along a line that bisects the corresponding device pattern.
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Accused Products
Abstract
A method according to one embodiment of the invention may be used in determining relative positions of developed patterns on a substrate (exposed e.g. using the step mode). Such a method uses reference marks which are located within or even superimposed on device patterns. Also disclosed is a mask of a lithographic projection apparatus including reference marks that may be used in such a method.
19 Citations
25 Claims
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1. A device manufacturing method comprising:
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projecting a first image onto a first target portion of a radiation-sensitive material that at least partially covers a substrate, the first image including a first device pattern and at least a first reference mark located within the first device pattern; projecting a second image, including a second device pattern and at least a second reference mark, onto a second target portion of the radiation-sensitive material; and determining a relative placement of the first image and the second image based on a relative position of the first reference mark and the second reference mark, wherein the first reference mark and the second reference mark are not superposed, and wherein the first image and the second image include two reference marks positioned along a line that bisects the corresponding device pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device manufacturing method comprising:
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projecting a first image onto a first target portion of a radiation-sensitive material that at least partially covers a substrate, the first image including a first device pattern and at least a first reference mark located within the first device pattern; projecting a second image, including a second device pattern and at least a second reference mark, onto a second target portion of the radiation-sensitive material; and determining a relative placement of the first image and the second image based on a relative position of the first reference mark and the second reference mark, wherein the first reference mark and the second reference mark are not superposed wherein said projecting the second image onto the second target portion of the radiation-sensitive material includes projecting the second image onto a plurality of target portions of the radiation-sensitive material, each of the plurality of target portions being adjacent to the first target portion, wherein the first target portion includes a plurality of regions, each of the plurality of regions corresponding to one of the plurality of adjacent target portions and being adjacent to the corresponding target portion, and wherein each of the plurality of regions includes at least the first reference mark. - View Dependent Claims (11)
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12. A data storage medium including instructions describing a device manufacturing method, said method comprising:
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projecting a first image onto a first target portion of a radiation-sensitive material that at least partially covers a substrate, the first image including a first device pattern and at least a first reference mark located within the first device pattern; projecting a second image, including a second device pattern and at least a second reference mark, onto a second target portion of the radiation-sensitive material; and determining a relative placement of the first image and the second image based on a relative position of the first reference mark and the second reference mark, wherein the first reference mark and the second reference mark are not superposed, wherein said projecting the second image onto the second target portion of the radiation-sensitive material includes projecting the second image onto a plurality of target portions of the radiation-sensitive material, each of the plurality of target portions being adjacent to the first target portion, wherein the first target portion includes a plurality of regions, each of the plurality of regions corresponding to one of the plurality of adjacent target portions and being adjacent to adjacent to the corresponding target portion, and wherein each of the plurality of regions includes at least the first reference mark. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A device manufacturing method comprising:
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projecting a first image onto a first target portion of a radiation-sensitive material that at least partially covers a substrate, the first image including at least a first reference mark; projecting a second image onto a second target portion of the radiation-sensitive material, wherein the second image includes at least a second reference mark; and determining a relative placement of the first image and the second image based on a relative position of the first reference mark in the first target portion and the second reference mark in the second target portion, wherein the two reference marks do not overlap one another, wherein said projecting the second image onto the second target portion of the radiation-sensitive material includes projecting the second image onto a plurality of target portions of the radiation-sensitive material, each of the plurality of target portions being adjacent to the first target portion, wherein the first target portion includes a plurality of regions, each of the plurality of regions corresponding to one of the plurality of adjacent target portions and being adjacent to the corresponding target portion, and wherein each of the plurality of regions includes at least the first reference mark. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification