Apparatus and method for setting semiconductor parameter
View Patent ↗Disclosed are a method and apparatus for setting a semiconductor parameter. The method for setting a semiconductor parameter according to an embodiment of the present disclosure is a method performed on a computing apparatus including one or more processors and a memory storing one or more programs executed by the one or more processors, the method including acquiring electrical measurement parameters corresponding to preset semiconductor manufacturing parameters, classifying the electrical measurement parameters into a plurality of groups according to a degree of correlation, extracting a correlation axis reflecting a correlation between electrical measurement parameters belonging to a corresponding group for each classified group, and predicting a figure of merit of a semiconductor device by using data values of electrical measurement parameters belonging to the corresponding group as input based on the correlation axis of each group.
1 . A method for setting a semiconductor parameter, the method being performed on a computing apparatus including one or more processors and a memory storing one or more programs executed by the one or more processors, the method comprising:
acquiring electrical measurement parameters corresponding to preset semiconductor manufacturing parameters;
classifying the electrical measurement parameters into a plurality of groups according to a degree of correlation;
extracting a correlation axis reflecting a correlation between electrical measurement parameters belonging to a corresponding group for each classified group; and
predicting a figure of merit of a semiconductor device by using data values of electrical measurement parameters belonging to the corresponding group as input based on the correlation axis of each group,
wherein the classifying of the electrical measurement parameters into the plurality of groups includes
calculating variance inflation factors between the electrical measurement parameters, respectively, and
classifying electrical measurement parameters of which the calculated variance inflation factor is equal to or greater than a preset threshold value into the same group.
2 . The method of claim 1 , wherein
the extracting of the correlation axis includes
generating an artificial neural network model for each group when grouping of the electrical measurement parameters is completed, and
extracting a correlation axis between the electrical measurement parameters belonging to each group by training each of the generated artificial neural network models.
3 . The method of claim 2 , wherein
the number of the correlation axes to be extracted is set to be the same as the number of electrical measurement parameters belonging to the corresponding group.
4 . The method of claim 2 , wherein
the calculating of the variance inflation factor when a missing value is included in the acquired electrical measurement parameter includes
checking whether or not there are data that are not missing at the same time in two electrical measurement parameters, and
calculating a variance inflation factor of the two electrical measurement parameters by using the data that are not missing at the same time when there are the data that are not missing at the same time.
5 . The method of claim 2 , wherein
when missing data is included in the acquired electrical measurement parameter, the method further includes
training the artificial neural network model by setting a partial loss error to zero for the missing data when the artificial neural network model is trained, and
predicting a missing value of a corresponding electrical measurement parameter by inputting the extracted correlation axis into the artificial neural network model when training of the artificial neural network model is completed.
6 . The method of claim 1 , further comprising:
setting an effective correlation axis among the correlation axes extracted for each group, wherein
in the predicting of the figure of merit of the semiconductor device,
the figure of merit of the semiconductor device is predicted by using data values of electrical measurement parameters belonging to the corresponding group as input based on the effective correlation axis set in each group.
7 . The method of claim 6 , wherein
the setting of the effective correlation axis includes
calculating explained variances (EVs) for the correlation axes extracted for each group, respectively, and
setting, among the correlation axes, a correlation axis in which a value of the calculated explained variance is equal to or greater than a preset threshold value as the effective correlation axis.
8 . The method of claim 1 , further comprising:
limiting a data range of the electrical measurement parameters in each classified group within a data distribution range with the extracted correlation axis as a reference.
9 . The method of claim 8 , further comprising:
calculating sensitivity to the figure of merit of the electrical measurement parameters within the data distribution range with the correlation axis as a reference; and
selecting an electrical measurement parameter capable of optimizing the corresponding figure of merit based on the calculated sensitivity.
10 . An apparatus for setting a semiconductor parameter, comprising:
a preprocessing module configured to acquire electrical measurement parameters corresponding to preset semiconductor manufacturing parameters, classify the electrical measurement parameters into a plurality of groups according to a degree of correlation, and extract a correlation axis reflecting a correlation between electrical measurement parameters belonging to a corresponding group for each classified group; and
a prediction module configured to predict a figure of merit of a semiconductor device by using data values of electrical measurement parameters belonging to the corresponding group as input based on the correlation axis of each group,
wherein the preprocessing module is configured to
calculate variance inflation factors between the electrical measurement parameters, respectively, and
classify electrical measurement parameters of which the calculated variance inflation factor is equal to or greater than a preset threshold value into the same group.
11 . The apparatus of claim 10 , wherein
the preprocessing module is configured to
generate an artificial neural network model for each group when grouping of the electrical measurement parameters is completed, and
extract a correlation axis between the electrical measurement parameters belonging to each group by training each of the generated artificial neural network models.
12 . The apparatus of claim 11 , wherein
the number of the correlation axes to be extracted is set to be the same as the number of electrical measurement parameters belonging to the corresponding group.
13 . The apparatus of claim 11 , wherein
the preprocessing module is configured to
check whether or not there are data that are not missing at the same time in two electrical measurement parameters when a missing value is included in the acquired electrical measurement parameter, and calculate a variance inflation factor of the two electrical measurement parameters by using the data that are not missing at the same time when there are the data that are not missing at the same time.
14 . The apparatus of claim 11 , wherein
the preprocessing module is configured to
train the artificial neural network model by setting a partial loss error to zero for missing data when the artificial neural network model is trained, and predict a missing value of a corresponding electrical measurement parameter by inputting the extracted correlation axis into the artificial neural network model when training of the artificial neural network model is completed.
15 . The apparatus of claim 10 , wherein
the preprocessing module is configured to set an effective correlation axis among the correlation axes extracted for each group, and
the prediction module is configured to predict the figure of merit of the semiconductor device by using data values of electrical measurement parameters belonging to the corresponding group as input based on the effective correlation axis set in each group.
16 . The apparatus of claim 15 , wherein
the preprocessing module is configured to
calculate explained variances (EVs) for the correlation axes extracted for each group, respectively, and set, among the correlation axes, a correlation axis in which a value of the calculated explained variance is equal to or greater than a preset threshold value as the effective correlation axis.
17 . The apparatus of claim 10 , wherein
the prediction module is configured to
limit a data range of the electrical measurement parameters in each classified group within a data distribution range with the extracted correlation axis as a reference.
18 . The apparatus of claim 17 , further comprising:
an analysis module configured to calculate sensitivity to the figure of merit of the electrical measurement parameters within the data distribution range with the correlation axis as a reference and select an electrical measurement parameter capable of optimizing the corresponding figure of merit based on the calculated sensitivity.