Patent ID: 7282415

Claim:
A method for making a semiconductor device comprising: providing a semiconductor substrate; forming a control electrode having a sidewall and overlying the semiconductor substrate; forming an insulating layer adjacent the sidewall of the control electrode; implanting the semiconductor substrate and the control electrode to form first and second doped current electrode regions and performing a halo implant to form asymmetric implantation of the first and second doped current electrode regions, a portion of each of the first and second doped current electrode regions being driven to underlie both the insulating layer and the control electrode in a channel region of the semiconductor device; removing the first and second doped current electrode regions from the semiconductor substrate except for underneath both the control electrode and the insulating layer to respectively form first and second trenches and removing a portion of the control electrode; performing an anneal in the presence of hydrogen at a temperature of at least six hundred degrees Celsius to modify a contour of the first and second trenches to be curvilinear to extend further from a channel of the semiconductor device as a function of distance into the semiconductor substrate; and forming an insitu doped material containing a different lattice constant relative to the semiconductor substrate within the portion of the control electrode and within the first and second trenches to fill the first and second trenches and function as first and second current electrodes of the semiconductor device, the first and second current electrodes applying a stress on the channel region.