Multi-Layer Model for Stressor Film Deposition

Multi-layer simulation is proposed for accurate modeling of stressor film deposition. Multi-layer simulation subdivides a single deposition into a series of deposition and relaxation steps to emulate mechanical quasi-equilibrium during the physical deposition process. Only the multi-layer model is able to simultaneously match the experimental data on drive current vs. etch-stop layer stress, poly pitch, source/drain recess, and spacer stress