Method for automatic determination of semiconductor plasma chamber matching and source of fault by comprehensive plasma monitoring
First Claim
1. A method of evaluating a process chamber, comprising:
- performing a first substrate processing operation and a first process perturbation operation in a reference chamber;
collecting optical emission spectroscopy (OES) data and radio frequency (RF) data during the first substrate processing operation and the first process perturbation operation;
performing a first multivariate analysis on the collected OES and RF data from the reference chamber to produce first multivariate analysis results;
performing a second substrate processing operation and a second process perturbation operation in a process chamber that is under study, where the first process operation and the second process operation are similar, and the first process perturbation operation and the second process perturbation operation are similar;
collecting OES data and RF data during the second process operation and the second process perturbation operation;
performing a second multivariate analysis on the collected OES and RF data from the chamber under study to produce second multivariate analysis results; and
comparing the second multivariate analysis results from the chamber under study to the first multivariate analysis results from the reference chamber.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and apparatus for automatic determination of semiconductor plasma chamber matching a source of fault are provided. Correlated plasma attributes are measured for process used for calibration both in a chamber under study and in a reference chamber. Principal component analysis then is performed on the measured correlated attributes so as to generate steady principal components and transitional principal components; and these principal components are compared to reference principal components associated with a reference chamber. The process used for calibration includes a regular plasma process followed by a process perturbation of one process parameter. Similar process perturbation runs are conducted several times to include different perturbation parameters. By performing inner products of the principal components of chamber under study and the reference chamber, matching scores can be reached. Automatic chamber matching can be determined by comparing these scores with preset control limits. The potential source(s) of chamber fault can also be identified by the lowest matching score(s).
83 Citations
31 Claims
-
1. A method of evaluating a process chamber, comprising:
-
performing a first substrate processing operation and a first process perturbation operation in a reference chamber; collecting optical emission spectroscopy (OES) data and radio frequency (RF) data during the first substrate processing operation and the first process perturbation operation; performing a first multivariate analysis on the collected OES and RF data from the reference chamber to produce first multivariate analysis results; performing a second substrate processing operation and a second process perturbation operation in a process chamber that is under study, where the first process operation and the second process operation are similar, and the first process perturbation operation and the second process perturbation operation are similar; collecting OES data and RF data during the second process operation and the second process perturbation operation; performing a second multivariate analysis on the collected OES and RF data from the chamber under study to produce second multivariate analysis results; and comparing the second multivariate analysis results from the chamber under study to the first multivariate analysis results from the reference chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A method of evaluating a process chamber, comprising:
-
performing a first substrate processing operation, followed by a first process perturbation operation of the first substrate process operation in a reference process chamber; collecting data of one or more plasma attributes during the substrate processing operation and the following first process perturbation operation in the reference process chamber; determining if the collected data of plasma attributes of the first process operation and the first process perturbation operation in the reference process chamber need to be manipulated; performing data manipulation on the data of plasma attributes of the reference chamber that are identified to need data manipulation; performing a multivariate analysis on the revised data of plasma attributes of the reference process chamber to produce first multivariate analysis results; performing a second substrate processing operation, followed by a second process perturbation operation of the first substrate process operation in a process chamber that is under study, wherein the first process operation and the second process operation are similar, and the first process perturbation operation and the second process perturbation operation are similar; collecting data of one or more plasma attributes during the second substrate processing operation and the following second process perturbation operation in the process chamber that is under study; performing data manipulation on the data of plasma attributes of the process chamber under study according to the data manipulation scheme used by the reference chamber; performing a multivariate analysis on the revised data of plasma attributes of the process chamber under study to produce second multivariate analysis results; comparing the second multivariate analysis results from the chamber under study to the first multivariate analysis results from the reference chamber. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
-
Specification