Patent ID: 6096598
Filing Date: 2000-08-01
Classification: G03F,H01L

Abstract:
A method for forming a feature on a semiconductor substrate, the method comprising the steps of:a) forming a trench having sidewalls and a bottom in the substrate;b) forming a dopant source layer on the substrate, said dopant source layer covering the trench sidewalls and trench bottom;c) forming a resist layer on the dopant source layer, said resist layer covering said dopant source layer on the trench sidewalls and trench bottom;d) exposing the resist layer at an angle such that upper portions of the resist layer on the trench sidewalls are exposed and lower portions of the resist layer on the trench sidewalls are unexposed;e) removing the exposed portion of the resist layer and the dopant source layer beneath the exposed portion of the resist layer; andf) diffusing dopant from the unexposed portion of the dopant source layer into the substrate.