Patent ID: 6230069
Filing Date: 2001-05-08
Classification: G05B,H01L,Y02P

Abstract:
A method for run-to-run control of a semiconductor manufacturing tool in a semiconductor fabrication facility wherein the tool has a plurality of process states respectively corresponding to stages of wafer handling during wafer manufacture, a tool output is a parameter characterizing a process state result, and a tool input is a parameter characterizing a control aspect of a process state, the method comprising:determining a tool output of the semiconductor manufacturing tool based on a first wafer run;determining a tool input for the semiconductor manufacturing tool for a subsequent wafer run by minimizing an optimization equation using the tool output, the optimization equation being dependent upon a model which relates tool output to tool process state and tool process state to tool input and previous tool process state; andproviding the tool input to the manufacturing tool for processing the subsequent wafer run.