Patent ID: 8992721
Filing Date: 2015-03-31
Classification: G05B,H01J

Abstract:
1. A plasma processing apparatus for applying plasma processing by run-to-run control to specimens that are disposed in a vacuum processing chamber by using plasma generated in the vacuum processing chamber, comprising: a first database that stores a first monitor value variation model indicating a correlation between a number of specimens processed during a period from execution of wet cleaning to execution of a next process and a monitor value of a process quantity obtained when specimens of this number have been processed; a second database that stores a second monitor value variation model indicating a correlation between a number of specimens processed during a period from start of a lot process to end of the lot process and a monitor value of a process quantity obtained when specimens of this number have been processed; a process history management unit that stores the number of specimens processed from execution of wet cleaning to execution of a next process and the number of specimens processed from start of a lot process to end of the lot process; a monitor value estimation unit configured to obtain a composite model of the first monitor value variation model and the second monitor value variation model and configured to calculate a monitor value for a next process based on the composite model; a third database that stores a control model indicating a correlation between a control quantity for controlling a process quantity of the vacuum processing chamber and a quantity of change of a monitor value; and a control quantity calculation unit configured to calculate a control quantity for the next process which corresponds to a deviation of the monitor value calculated by the monitor value estimation unit and a target value based on the control model; wherein the monitor value estimation unit comprises a monitor value variation model movement unit configured to move the first monitor value variation model for processing just after aging; wherein the first monitor value variation model is a function of processed wafers from wet cleaning, and at least one long term variation model coefficient; wherein the second monitor variation model is a function of the number of processed wafers in a lot and at least one short-term model coefficient.