Method for repairing opaque defects on semiconductor mask reticles
First Claim
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1. A method for evaluating at least one opaque defect on a mask substrate, the method comprising:
- identifying an opaque defect based on a difference between its light reflection rate and a reference reflection rate;
determining a residue height of the opaque defect based on a light transmission rate; and
devising a repair formula based on the determined residue height for eliminating the opaque defect.
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Abstract
A method is disclosed for repairing an opaque defect on a mask substrate. After examining one or more opaque patterns in a predetermined area of the mask substrate, at least one opaque defect in the opaque patterns is identified based on a difference between its light reflection rate and a reference reflection rate. A residue height of the opaque defect is further determined based on its light transmission rate, and a repair formula such as an etching dosage is devised based on the determined residue height.
11 Citations
20 Claims
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1. A method for evaluating at least one opaque defect on a mask substrate, the method comprising:
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identifying an opaque defect based on a difference between its light reflection rate and a reference reflection rate;
determining a residue height of the opaque defect based on a light transmission rate; and
devising a repair formula based on the determined residue height for eliminating the opaque defect. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for repairing an opaque defect on a mask substrate, the method comprising:
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examining one or more opaque patterns in a predetermined area of the mask substrate;
identifying at least one opaque defect in the opaque patterns based on a difference between its light reflection rate and a reference reflection rate;
determining a residue height of the opaque defect based on its light transmission rate; and
devising a repair formula based on the determined residue height. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method for repairing an opaque defect on a mask substrate, the system comprising:
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examining one or more opaque patterns of the mask substrate;
imposing a light source over the opaque patterns;
determining light reflection rates of the opaque patterns;
identifying one or more normal opaque patterns based on the determined light reflection rates;
identifying a reference reflection rate based on the light reflection rates identified for the normal opaque patterns;
identifying at least one opaque defect in the opaque patterns based on a difference between its light reflection rate and the reference reflection rate;
determining a light transmission rate of the opaque defect;
determining a residue height of the opaque defect based on its light transmission rate; and
devising a repair formula based on the determined residue height. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification