Optical proximity correction method utilizing ruled ladder bars as sub-resolution assist features
First Claim
1. A photolithography mask for optically transferring a pattern formed in said mask onto a substrate, said mask comprising:
- a plurality of resolvable features to be printed on said substrate, each of said plurality of resolvable features having a longitudinal axis extending in a first direction; and
a pair of non-resolvable optical proximity correction features disposed between two of said plurality of resolvable features, said pair of non-resolvable optical proximity correction features having a longitudinal axis extending in a second direction, wherein said first direction of said longitudinal axis of said plurality of resolvable features is orthogonal to said second direction of said longitudinal axis of said pair of non-resolvable optical proximity correction features, and wherein said pair of non-resolvable optical proximity correction features have a length dimension which is substantially equal to the width of a space separating said two of said plurality of resolvable features.
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Accused Products
Abstract
A photolithography mask for optically transferring a pattern formed in said mask onto a substrate and for negating optical proximity effects. The mask includes a plurality of resolvable features to be printed on the substrate, where each of the plurality of resolvable features has a longitudinal axis extending in a first direction; and a pair of non-resolvable optical proximity correction features disposed between two of the plurality of resolvable features, where the pair of non-resolvable optical proximity correction features has a longitudinal axis extending in a second direction, wherein the first direction of the longitudinal axis of the plurality of resolvable features is orthogonal to the second direction of the longitudinal axis of the pair of non-resolvable optical proximity correction features.
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Citations
23 Claims
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1. A photolithography mask for optically transferring a pattern formed in said mask onto a substrate, said mask comprising:
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a plurality of resolvable features to be printed on said substrate, each of said plurality of resolvable features having a longitudinal axis extending in a first direction; and
a pair of non-resolvable optical proximity correction features disposed between two of said plurality of resolvable features, said pair of non-resolvable optical proximity correction features having a longitudinal axis extending in a second direction, wherein said first direction of said longitudinal axis of said plurality of resolvable features is orthogonal to said second direction of said longitudinal axis of said pair of non-resolvable optical proximity correction features, and wherein said pair of non-resolvable optical proximity correction features have a length dimension which is substantially equal to the width of a space separating said two of said plurality of resolvable features. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A computer program product for controlling a computer comprising a recording medium readable by the computer, means recorded on the recording medium for directing the computer to generate at least one file corresponding to a photolithography mask for optically transferring a pattern formed in said mask onto a substrate, said mask comprising:
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a plurality of resolvable features to be printed on said substrate, each of said plurality of resolvable features having a longitudinal axis extending in a first direction; and
a pair of non-resolvable optical proximity correction features disposed between two of said plurality of resolvable features, said pair of non-resolvable optical proximity correction features having a longitudinal axis extending in a second direction, wherein said first direction of said longitudinal axis of said plurality of resolvable features is orthogonal to said second direction of said longitudinal axis of said pair of non-resolvable optical proximity correction features, and wherein said pair of non-resolvable optical proximity correction features have a length dimension which is substantially equal to the width of a space separating said two of said plurality of resolvable features. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of transferring a lithographic pattern from a photolithography mask onto a substrate by use of a lithographic exposure apparatus, said method comprising the steps of:
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forming a plurality of resolvable features to be-printed on said substrate, each of said plurality of resolvable features having a longitudinal axis extending in a first direction; and
forming a pair of non-resolvable optical proximity correction features disposed between two of said plurality of resolvable features, said pair of non-resolvable optical proximity correction features having a longitudinal axis extending in a second direction, wherein said first direction of said longitudinal axis of said plurality of resolvable features is orthogonal to said second direction of said longitudinal axis of said pair of non-resolvable optical proximity correction features, and wherein said pair of non-resolvable optical proximity correction feature have a length dimension which is less than the width of a space separating said two of said plurality of resolvable features, said length of said pair of non-resolvable optical proximity correction being adjusted so as to minimize the increase in a second order diffraction component of said mask associated with said mask. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A device manufacturing method comprising the steps of:
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(a) providing a substrate that is at least partially covered by a layer of radiation-sensitive material;
(b) providing a projection beam of radiation using a radiation system;
(c) using a pattern on a mask to endow the projection beam with a pattern in its cross-section;
(d) projecting the patterned beam of radiation onto a target portion of the layer of radiation-sensitive material, wherein, in step (c), use is made of a mask comprising;
a plurality of resolvable features to be printed on said substrate, each of said plurality of resolvable features having a longitudinal axis extending in a first direction; and
a pair of non-resolvable optical proximity correction features disposed between two of said plurality of resolvable features, said pair of non-resolvable optical proximity correction features having a longitudinal axis extending in a second direction, wherein said first direction of said longitudinal axis of said plurality of resolvable features is orthogonal to said second direction of said longitudinal axis of said pair of non-resolvable optical proximity correction features, and wherein said pair of non-resolvable optical proximity correction features have a length dimension which is substantially equal to the width of a space separating said two of said plurality of resolvable features.
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Specification