Patent ID: 6083809
Filing Date: 2000-07-04
Classification: H01L

Abstract:
A method of fabricating a semiconductor device which comprises the steps of:(a) providing a layer of silicon having a thin pad oxide layer thereon and a patterned layer of a masking material not permeable to at least selected oxygen-bearing species and having a sidewall disposed over said pad oxide layer to provide an exposed intersection of said masking material and said pad oxide layer;(b) forming a conductive path permeable to selected oxygen-bearing species on the sidewall of said masking material extending to said exposed intersection and said pad oxide for conducting said selected oxygen-bearing species to said pad oxide;(c) forming a sidewall layer of a material different from said conductive path on said conductive path extending to said pad oxide; and(d) fabricating a thick oxide in said silicon, said thick oxide extending under said conductive path and said sidewall layer of different material surrounding said masking material, fabrication of the portion of said thick oxide under said conductive path being accomplished at least in part by said selected oxygen-bearing species travelling to said pad oxide through said conductive path.