Patent ID: 7271044

Claim:
A structure formation method, comprising: providing a structure including: (a) a semiconductor region comprising a semiconductor region top surface, and (b) first and second dopant source regions on and in direct physical contact with the semiconductor region top surface, wherein each region of the first and second dopant source regions comprises a first dielectric material which contains first dopants; forming a diffusion barrier region (i) on and in direct physical contact with the semiconductor region top surface and (ii) in direct physical contact with the first and second dopant source regions; then causing the first dopants to diffuse from the first and second dopant source regions into the semiconductor region resulting in first and second source/drain extension regions, respectively, in the semiconductor region, wherein the first and second source/drain extension regions define a channel region in the semiconductor region, and wherein the channel region is (i) disposed between and in direct physical contact with the first and second source/drain extension regions and (ii) in direct physical contact with the semiconductor region top surface; then removing the diffusion barrier region; then forming a gate dielectric region on the channel region; and forming a gate region on the gate dielectric region, wherein the gate dielectric region electrically insulates the gate region from the channel region.