Wet etch step modelling to help shallow trench isolation module control

We propose a method to model the wet etch process within the Shallow Trench Isolation (STI) module in the CMOS technology. To model a process is the first step in the design of a run to run system, in order to reduce for example the lot to lot variability (a lot equals 25 wafers). The developed predictive model is based on a Design Of Experiments (DOE).