Patent ID: 7723196

Claim:
A method for forming a MOSFET, comprising the steps of: forming a sacrificial gate over a channel layer that is on a substrate; forming a source extension and a drain extension in said channel layer thereby defining a channel between said source and drain extensions; forming an insulating layer on top of said source extension and said drain extension, and adjacent to said sacrificial gate; removing the sacrificial gate to form a first cavity with a sidewall portion defined by said insulating layer, and a bottom defined by said channel layer; forming a dielectric layer over said channel layer and on said sidewall portion of the first cavity defined by said insulating layer; forming a gate spacer structure over a peripheral portion of a top surface of said dielectric layer; said gate spacer structure having an internal surface with a lower portion that is substantially perpendicular to said top surface of said dielectric layer whereby a second cavity is defined at its sidewall by said internal surface of said gate spacer structure and at its bottom by said dielectric layer; and forming a gate contact by disposing an electrically conductive material into said second cavity to contact said top surface of said dielectric layer.