Patent ID: 6977419

Claim:
A short-channel Metal-Oxide-Silicon Field Effect Transistor (MOSFET) device, comprising: a stacked gate over an active region surrounded by an isolation region on a substrate; a protective cap layer over the gate electrode stack; a pair of LDD regions disposed substantially adjacent to the gate electrode stack and apart from each other at opposite sides of the gate electrode stack; a first spacer layer disposed around the gate electrode stack such that the disposed first spacer layer together with the disposed protective cap layer encloses the gate electrode stack; source and drain recesses disposed adjacent to the LDD regions such that the source and drain recesses have a sidewall adjacent to the LDD regions and below the first spacer layer; a dielectric spacer disposed substantially below the LDD regions and around the sidewalls of the source and drain recesses such that the dielectric spacer forms a channel region between the source and drain recesses; and source and drain regions comprising epitaxial silicon filling in the source and drain recesses and a layer of doped silicon region in the epitaxial silicon filling.