Patent ID: 6667512
Filing Date: 2003-12-23
Classification: H01L

Abstract:
A method of fabricating an asymmetrical retrograde HALO Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), comprising the steps of:(a) providing a semiconductor substrate; (b) forming a gate over the substrate, the gate defining a channel thereunder in the substrate having a source side and a drain side; (c) forming a retrograde HALO doped area in the source side of the channel using tilted ion implantation with a tilt angle of approximately 30Â° to 60Â° wherein the retrograde HALO doped area is in contact with the surface of the channel; (d) forming a source in the substrate adjacent to the source side of the channel; and (e) forming a drain in the substrate adjacent to the drain side of the channel, wherein a dopant concentration of the retrograde HALO doped area decreases from the source side of the channel toward the drain side of the channel.