Patent ID: 7858457
Filing Date: 2010-12-28
Classification: H01L

Abstract:
1. A method of forming a semiconductor device, comprising: forming a dummy gate pattern on a semiconductor substrate; removing a portion of the substrate adjacent to opposite sides of the dummy gate pattern to form a protruding channel region in the semiconductor substrate below the dummy gate pattern; forming an L-shaped sacrificial layer pattern covering a surface of the substrate proximate opposite sides of the dummy gate pattern and extending along a portion of a sidewall of the protruding channel region; forming an epitaxial layer covering a portion of the sidewall of the channel region not covered by the sacrificial layer pattern and covering a lower sidewall of the dummy gate pattern and covering the sacrificial layer pattern; etching the epitaxial layer, the sacrificial layer pattern, and a predetermined portion of the substrate to form a trench exposing a sidewall of the epitaxial layer and a sidewall of the sacrificial layer pattern; removing the sacrificial layer pattern exposed by the trench to define a path; and forming a depletion barrier layer in the defined path.