Patent ID: 7184851
Filing Date: 2007-02-27
Classification: G05B,H01L,Y02P

Abstract:
1. A method for tool monitoring, comprising: providing a first cassette containing a plurality of first control wafers used for a first metrology process; loading the first cassette onto a first processing tool; processing one of the first control wafers using the first processing tool; loading the first cassette onto a first metrology tool; using the first metrology tool to perform the first metrology process on the first control wafer processed by the first processing tool; providing a second cassette containing a plurality of second control wafers used for a second metrology process; loading the second cassette onto the first processing tool; processing one of the second control wafers using the first processing tool; loading the second cassette onto a second metrology tool; and using the second metrology tool to perform the second metrology process on the second control wafer processed by the first processing tool.