Substrate provided with an alignment mark in a substantially transmissive process layer, mask for exposing said mark, device manufacturing method, and device manufactured thereby
First Claim
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1. A device manufacturing method, comprising:
- providing a substrate comprising an alignment mark that is disposed in a transmissive layer, the alignment mark comprising a relatively high reflectance area and a low reflectance area that is at least partially covered by a layer of radiation sensitive material;
aligning the alignment mark to a reference, with an alignment beam of radiation;
providing a projection beam of radiation using a radiation system;
using a patterning structure to endow the projection beam with a patterned cross-section; and
projecting the patterned beam of radiation onto a target portion of the layer of radiation sensitive material,wherein the relatively high reflectance area comprises a plurality of substantially linear sub-gratings, at least one of the substantially linear sub-gratings comprising a plurality of spaced square regions.
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Abstract
A substrate provided with an alignment mark in a substantially transmissive process layer overlying the substrate, said mark comprising high reflectance areas for reflecting radiation of an alignment beam of radiation, and low reflectance areas for reflecting less radiation of the alignment beam, wherein the high reflectance areas comprise at least one substantially linear sub-grating. In one example, a substantially linear sub-grating comprises a plurality of spaced square regions.
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Citations
10 Claims
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1. A device manufacturing method, comprising:
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providing a substrate comprising an alignment mark that is disposed in a transmissive layer, the alignment mark comprising a relatively high reflectance area and a low reflectance area that is at least partially covered by a layer of radiation sensitive material; aligning the alignment mark to a reference, with an alignment beam of radiation; providing a projection beam of radiation using a radiation system; using a patterning structure to endow the projection beam with a patterned cross-section; and projecting the patterned beam of radiation onto a target portion of the layer of radiation sensitive material, wherein the relatively high reflectance area comprises a plurality of substantially linear sub-gratings, at least one of the substantially linear sub-gratings comprising a plurality of spaced square regions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification