Patent ID: 8610217

Claim:
A field effect transistor comprising: a semiconductor layer having a top surface; an isolation structure in said semiconductor layer at said top surface; a gate structure on said top surface offset from said isolation structure, said gate structure having gate sidewalls; sidewall spacers on said top surface positioned laterally immediately adjacent to said gate sidewalls, said semiconductor layer comprising: a channel region below said gate structure; source/drain extension regions on opposing sides of said channel region, each source/drain extension region extending vertically from said top surface to a first depth below said top surface and comprising a first end portion adjacent to said channel region, a second end portion adjacent to said isolation structure and a center portion positioned laterally between said first end portion and said second end portion; and source/drain regions on said opposing sides of said channel region, each source/drain region comprising: a first section extending vertically through said first end portion of a source/drain extension region to a second depth below said first depth; and a second section extending vertically through said second end portion of said source/drain extension region to said second depth; first dielectric layers on said top surface aligned above and abutting said center portion of each of said source/drain extension regions, respectively; second dielectric layers above and abutting said first dielectric layers, respectively, each second dielectric layer extending laterally onto said top surface above said first section of a source/drain region to an outer edge of a sidewall spacer adjacent to said gate structure, and further extending laterally onto said top surface above said second section of said source/drain region; and metal silicide layers on said top surface above said second section of each of said source/drain regions, each metal silicide layer being positioned laterally immediately adjacent to a second dielectric layer.