Method for forming localized halo implant regions

摘要

A method for forming a localized halo implant region, comprises: implanting a first dosage of ions of a first type toward a surface of a substrate having a gate electrode formed thereon, so as to form a lightly doped region adjacent to the gate electrode; forming a disposable spacer on a sidewall of the gate electrode; forming an elevated source/drain structure adjacent to the disposable spacer; implanting a second dosage of ions of the first type toward the surface of the substrate so as to form a heavily doped region adjacent to the disposable spacer; removing the disposable spacer; and tilt-angle implanting at least one dosage of ions of a second type toward a gap created by the disposable spacer having been removed so as to form a localized halo implant region in the substrate, preferably by utilizing shadow effects of the gate electrode and the elevated source/drain structure.