Innovatively composite hard mask to feature sub-30nm gate patterning
We present an innovatively composite ?-Si/SiO2/Si3N4/SiO2 etching technology. Line width and line width roughness closely relates to etch selectivities. Current etching process does not have a strong dependence on the line width. Ultra-fine 22nm gate patterns with good LWR are achieved.
hard mask sub-30nm gate patterning line width roughness etch selectivity plasma etching