Patent ID: 7576379

Claim:
A semiconductor-on-insulator (SOI) metal-oxide-semiconductor field effect transistor (MOSFET) structure comprising: a first source portion with a first thickness; a second source portion with a second thickness, wherein said second thickness is greater than said first thickness; and a first floating body portion located underneath said first source portion and not contacting said first source portion; a second floating body portion, wherein said second floating body portion is located under a gate dielectric; a drain having a third thickness, wherein said second thickness and said third thickness are the same; a depletion zone contacting said gate dielectric, said first source portion, said second source portion, and said drain; a raised source portion that is epitaxially disposed over said first source portion and said second source portion; a source contact contacting said raised source portion; a drain contact contacting said drain, wherein a bottom of said source contact is located higher than a bottom of said drain contact, wherein said depletion zone and said second floating body portion has a doping concentration in the range from about 1.0×10 18 /cm 3 to about 5.0×10 19 /cm 3 , and wherein said first floating body portion has a substantially the same doping concentration as said floating body portion.