Patent ID: 6245619
Filing Date: 2001-06-12
Classification: H01L

Abstract:
A method of fabricating a sub-0.05 .mu.m MOSFET device having a Super-Halo doping profile comprising the steps of:(a) providing a structure having a gate stack formed on a surface of a substrate, said gate stack comprising at least a pad oxide layer formed on said-surface of said substrate and a first nitride layer formed on said pad oxide layer;(b) forming at least one isolation trench region in said structure, said at least one isolation trench region being formed in said gate stack and a portion of said substrate;(c) forming an oxide liner in said at least one isolation trench region;(d) filling said at least one isolation trench region with a trench dielectric material;(e) forming well implant regions in said substrate;(f) forming a second nitride layer on said first nitride layer of said gate stack, wherein the total thickness of the first nitride layer and the second nitride layer is substantially equal to the thickness of a gate region to be formed subsequently therein;(g) forming a gate hole in said first and second nitride layers stopping on said pad oxide layer;(h) removing said pad oxide layer in said gate hole exposing a portion of said substrate;(i) forming a thin oxide layer in said gate hole on said exposed portion of said substrate, said thin oxide layer having a thickness of 3 nm or less;(j) filling said gate hole with polysilicon;(k) removing said first and second nitride layers so as to expose sidewalls of said polysilicon;(l) oxidizing the exposed sidewalls of said polysilicon including the top surface thereof;(m) forming nitride spacers on said oxidized sidewalls of said polysilicon;(n) forming source and drain regions in said substrate, wherein said source and drain regions are activated using an annealing temperature of 1000.degree. C. or greater for a time period of 5 seconds or greater;(o) removing said nitride spacers; and(p) forming source/drain extensions and halo implant regions in said substrate, wherein said halo implant regions are activated by annealing at a temperature of 1000.degree. C. or lower for a time period of 1 second or less.