Patent ID: 8629046

Claim:
A method of manufacturing a semiconductor device, comprising: providing a substrate including a gate stack having spacers; performing a first implantation process on the substrate including the gate stack and spacers such that the substrate is amorphized; forming a first stress film over the amorphized substrate including the gate stack and spacers; performing a first annealing process on the amorphized substrate and the first stress film such that a first stress region is formed within the substrate; after forming the first stress region, removing the first stress film and the spacers; performing a second implantation process on the substrate such that a top portion of the first stress region is amorphized; forming a second stress film over the amorphized top portion of the first stress region; and performing a second annealing process on the amorphized top portion of the first stress region and the second stress film such that a second stress region is formed over the first stress region within the substrate.