Patent ID: 6489206
Filing Date: 2002-12-03
Classification: H01L

Abstract:
A method for forming a self-aligned local-halo metal-oxide-semiconductor device, comprising:providing a semiconductor substrate with a first conductive type having a plurality of shallow trench isolation formed therein; sequentially forming a gate oxide and a gate electrode between each pair of said shallow trench isolation over said substrate; forming a first sidewall spacer along each side of said gate electrode; forming a second sidewall spacer along one side of each said first sidewall spacer; performing a ultra-high vacuum chemical vapor deposition (UHVCVD) method to form a raised source/drain of selective epitaxial growth (SEG) silicon upward on said substrate between each said shallow trench isolation and each said second sidewall spacer; removing each said second sidewall spacer; forming a lightly doped diffusion region with a second conductive type being opposite with said first conductive type between each said raised source/drain and said gate electrode in said substrate; and forming a halo diffusion region with said first conductive type surrounding said lightly doped diffusion region.