Patent ID: 6673712
Filing Date: 2004-01-06
Classification: H01L

Abstract:
A method of forming a dual-implanted gate on a substrate having a gate oxide layer thereon, comprising the steps of:forming a plurality of stack structures on the substrate, wherein each stack structure belongs to a first group or a second group and each stack structure includes a polysilicon layer, a sacrificial layer and a mask layer; forming a dielectric layer over the substrate covering the stack structures; planarizing the dielectric layer to expose the upper surface of the mask layer within the stack structures; removing the mask layer to form a plurality of trenches; conducting a first ion implantation to implant first type ions into the stack structures belonging to the first group; conducting a second ion implantation to implant second type ions into the stack structures belonging to the second group; removing the sacrificial layer; forming a barrier layer over the substrate covering the interior surface of the trenches; forming a metallic layer over the substrate completely filling the trenches; removing the metallic layer and barrier layer above and beyond the trenches; and removing the dielectric layer to form gate structures.