Patent ID: 9245975
Filing Date: 2016-01-26
CPC Classification: H01L

Claim Text:
1. A method of fabricating a metal-oxide-semiconductor field-effect transistor formed at a surface of single-crystal silicon, the surface having a first conductivity type, the method comprising: forming dummy gate dielectric at a selected location of the surface, the selected location of the surface having a first conductivity type; forming a dummy gate electrode overlying the dummy gate dielectric at the selected location; forming dielectric structures on opposing sides of the dummy gate electrode, portions of the dielectric structures overlying portions of the dummy gate dielectric; forming source/drain regions of a second conductivity type into the surface at locations on opposite sides of the dummy gate electrode; then removing the first dummy gate electrode; etching the dummy gate dielectric material from the selected location of the surface and under portions of the dielectric structures; etching a recess into the silicon at locations between and under the dielectric structures; forming a gate dielectric layer at the surface of the recess; and forming a gate electrode overlying the gate dielectric layer and between the dielectric structures, the gate electrode having portions extending under the dielectric structures.