Method for controlling a gas supply to a process chamber, controller for controlling a gas supply to a process chamber, and apparatus

Abstract

A method for controlling a gas supply to a process chamber is provided. The method includes: measuring a gas parameter by each of two or more sensors provided in the process chamber; determining a combined gas parameter from the measured gas parameters; and controlling the gas supply to the process chamber based on the determined combined gas parameter.

What is claimed is: 
     
         1 . A method for controlling a gas supply to a process chamber, comprising:
 measuring a gas parameter by each of two or more sensors provided in the process chamber;   determining a combined gas parameter from the measured gas parameters; and   controlling the gas supply to the process chamber based on the determined combined gas parameter, wherein controlling the gas supply includes adjusting the gas supply such that the gas parameter measured by at least one of the two or more sensors corresponds to the combined gas parameter.   
     
     
         2 . The method of  claim 1 , wherein the gas parameter is at least one of a gas concentration, a mass and a pressure. 
     
     
         3 . The method of  claim 1 , wherein measuring the gas parameter includes measuring, by each of the two or more sensors, two or more gas parameter values within a time interval. 
     
     
         4 . The method of  claim 3 , wherein the combined gas parameter is determined from the two or more gas parameter values. 
     
     
         5 . The method of  claim 3 , further comprising:
 determining, for each sensor, a sensor combined value from the gas parameter values measured by the respective sensor in the time interval.   
     
     
         6 . The method of  claim 5 , wherein the combined gas parameter is determined based on the sensor combined values. 
     
     
         7 . The method of  claim 1 , wherein the combined gas parameter is an average gas parameter. 
     
     
         8 . The method of  claim 1 , wherein the gas supply is further controlled based on a process power. 
     
     
         9 . The method of  claim 1 , wherein controlling the gas supply utilizes P, PI or PID control. 
     
     
         10 . The method of  claim 1 , wherein the controlling the gas supply includes controlling a gas flow through one or more gas inlets. 
     
     
         11 . The method of  claim 1 , wherein the method is performed during a reactive process a reactive sputtering process. 
     
     
         12 . A controller for controlling a gas supply to a process chamber, wherein two or more sensors each configured to measure a gas parameter are provided in the process chamber, the controller being configured to:
 determine a combined gas parameter of the gas parameters measured by the two or more sensors; and   control the gas supply to the process chamber based on the determined combined gas parameter,   the controller being configured to adjust the gas supply such that the gas parameter measured by at least one of the two or more sensors corresponds to the combined gas parameter.   
     
     
         13 . An apparatus, comprising:
 a process chamber having at least one gas inlet;   two or more sensors each configured to measure a gas parameter in the process chamber; and   a controller according to  claim 12 .   
     
     
         14 . The apparatus of  claim 13 , wherein at least one of the two or more sensors is selected from the group including a lambda sensor, a pressure gauge, a mass spectrometer and a residual gas analyzer.