Patent ID: 7242998
Filing Date: 2007-07-10
Classification: G05B,H01L

Abstract:
1. A system for etching operation management, comprising: a metrology tool; an etching tool; and a process controller coupling to the etching tool and the metrology tool, acquiring a line width on a processed wafer measured by the metrology tool, determining a first Critical Dimension (CD) bias by subtracting the measured line width from a target width, determining a first etching duration, determining a second etching duration, determining an adjusted target width based on the first and second etching durations, calculating a second CD bias according at least to the adjusted target width, determining a third etching duration corresponding to the second CD bias, and directing the etching tool to perform an etching operation on another wafer for the third etching duration, wherein the adjusted target width is calculated by an equation: where W at represents the adjusted target width, W t represents the target width, R represents an etching rate, T i represents the second etching duration, and T o represents the first etching duration.