Methods and systems for determining a dose-to-clear of a photoresist
First Claim
1. A computer-implemented method of determining a dose-to-clear of a photoresist on a wafer, wherein the dose-to-clear is the amount of energy to which the photoresist must be exposed in order to dissolve the entire exposed area of the photoresist when the photoresist is developed, the method comprising:
- providing an image of the wafer after the photoresist was exposed to a dose of energy and was developed;
transforming, with a processor, the image of the wafer into frequency spectrum data;
calculating, with the processor, an average frequency spectrum component of the frequency spectrum data;
calculating, with the processor, a difference between the average frequency spectrum component and a noise average frequency spectrum component of a noise average frequency spectrum; and
determining a dose-to-clear the photoresist based on the difference between the average frequency spectrum component and the noise average frequency spectrum component.
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Abstract
A method of determining a dose-to-clear of a photoresist on a wafer includes providing an image of the wafer after the photoresist was exposed to a dose of energy and was developed, transforming the image of the wafer into frequency spectrum data, calculating an average frequency spectrum component of the frequency spectrum data, calculating a difference between the average frequency spectrum component and a noise average frequency spectrum component of a noise average frequency spectrum, and determining a dose-to-clear of the photoresist based on the difference between the average frequency spectrum component and the noise average frequency spectrum component.
3 Citations
20 Claims
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1. A computer-implemented method of determining a dose-to-clear of a photoresist on a wafer, wherein the dose-to-clear is the amount of energy to which the photoresist must be exposed in order to dissolve the entire exposed area of the photoresist when the photoresist is developed, the method comprising:
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providing an image of the wafer after the photoresist was exposed to a dose of energy and was developed; transforming, with a processor, the image of the wafer into frequency spectrum data; calculating, with the processor, an average frequency spectrum component of the frequency spectrum data; calculating, with the processor, a difference between the average frequency spectrum component and a noise average frequency spectrum component of a noise average frequency spectrum; and determining a dose-to-clear the photoresist based on the difference between the average frequency spectrum component and the noise average frequency spectrum component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A computer-implemented method of determining projection optics flare in a lithographic system, the method comprising:
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determining a dose-to-clear of a photoresist on a wafer, wherein the dose-to-clear is the amount of energy to which the photoresist must be exposed in order to dissolve the entire exposed area of the photoresist when the photoresist is developed, determining the dose-to-clear comprising; providing an image of the wafer after the photoresist was exposed to a dose of energy and was developed; transforming, with a processor, the image of the wafer into frequency spectrum data; calculating, with the processor, an average frequency spectrum component of the frequency spectrum data; calculating, with the processor, a difference between the average frequency spectrum component and a noise average frequency spectrum component of a noise average frequency spectrum; and determining a dose-to-clear the photoresist based on the difference between the average frequency spectrum component and the noise average frequency spectrum component; and determining the projection optics flare based on the dose-to-clear. - View Dependent Claims (11, 12)
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13. A non-transitory computer readable medium storing control logic for operating a computer system, the control logic including control logic instructions for determining a dose-to-clear of a photoresist on a wafer, wherein the dose-to-clear is the amount of energy to which the photoresist must be exposed in order to dissolve the entire exposed area of the photoresist when the photoresist is developed, the instructions when executed by a processor perform the steps comprising:
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providing an image of the wafer after the photoresist was exposed to a dose of energy and was developed; transforming the image of the wafer into frequency spectrum data; calculating an average frequency spectrum component of the frequency spectrum data; calculating a difference between the average frequency spectrum component and a noise average frequency spectrum component of a noise average frequency spectrum; and determining a dose-to-clear the photoresist based on the difference between the average frequency spectrum component and the noise average frequency spectrum component. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification