Method for automatically de-skewing of multiple layer wafer for improved pattern recognition
First Claim
1. A computer implemented method comprising:
- receiving by a computer a pattern of a first de-skew site on a layer on a wafer;
finding in the computer a match of the pattern with one of a plurality of learned patterns in a recipe, wherein the recipe includes a first set of coordinates of the first de-skew site and the plurality of learned patterns includes learned patterns of the first de-skew site for different layers;
determining in the computer a second set of coordinates of a second de-skew site on the layer;
determining in the computer a transforming matrix from the first and the second sets of coordinates of the first and the second de-skew sites; and
using the transforming matrix to de-skew the wafer.
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Accused Products
Abstract
A method for processing wafers includes learning a first pattern at a de-skew site on a first wafer layer, saving the first patterns in a recipe for de-skewing wafers, learning a second pattern at the de-skew site a second wafer layer, and saving the second pattern in the same recipe for de-skewing wafers. Learning the first pattern may include determining a score of uniqueness for the first pattern. The method further includes finding the de-skew site on the second wafer layer using the first pattern before learning the second pattern. Finding the de-skew site includes determining a score of similarity between the first pattern and the second pattern. Learning the second pattern is performed when the score of similarity is less than a threshold value. A recipe for de-skewing wafers includes multiple patterns of a de-skew site of a wafer, wherein the patterns include a first pattern at the de-skew site on a first wafer layer and a second pattern at the de-skew site on a second wafer layer.
26 Citations
10 Claims
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1. A computer implemented method comprising:
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receiving by a computer a pattern of a first de-skew site on a layer on a wafer; finding in the computer a match of the pattern with one of a plurality of learned patterns in a recipe, wherein the recipe includes a first set of coordinates of the first de-skew site and the plurality of learned patterns includes learned patterns of the first de-skew site for different layers; determining in the computer a second set of coordinates of a second de-skew site on the layer; determining in the computer a transforming matrix from the first and the second sets of coordinates of the first and the second de-skew sites; and using the transforming matrix to de-skew the wafer. - View Dependent Claims (2, 3, 4, 5)
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6. A computer implemented method comprising:
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receiving by a computer a de-skew pattern at a first de-skew site on a layer on a wafer; finding in the computer a match of the de-skew pattern with a learned pattern in a recipe, wherein the recipe includes a first set of coordinates of the first de-skew site and the learned pattern, the learned pattern matching a plurality of patterns at the first de-skew site on a plurality of layers on the wafer; determining in the computer a second set of coordinates of a second de-skew site on the layer; determining in the computer a transforming matrix from the first and the second sets of coordinates of the first and the second de-skew sites; and using the transforming matrix to de-skew the wafer. - View Dependent Claims (7, 8, 9, 10)
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Specification