Patent ID: 7253049
Filing Date: 2007-08-07
Classification: H01L

Abstract:
1. A method for making PMOS and NMOS transistors on a semiconductor wafer, comprising: providing a semiconductor substrate; forming a gate oxide layer over said semiconductor substrate; forming a gate polysilicon layer over said gate oxide layer; implanting dopants into said gate polysilicon layer; forming a protection layer over said gate polysilicon layer etching said protection layer, said gate polysilicon layer, and said gate oxide layer to form gate stacks having a gate protection layer, a gate electrode, and a gate dielectric; implanting extension regions within a top surface of said semiconductor substrate; forming spacer sidewalls coupled to said extension sidewalls; implanting source/drain regions within a top surface of said semiconductor substrate; annealing said semiconductor wafer to create sources/drains; forming a first layer of silicidation metal over said semiconductor wafer; performing a silicide anneal to create a silicide within a top surface of said sources/drains; and removing said gate protection layer of said gate stacks.