Patent ID: 6489227
Filing Date: 2002-12-03
Classification: H01L

Abstract:
A method of forming a fuse structure opening in a stack of materials, on a semiconductor substrate, to expose a fuse structure element, comprising the steps of:providing said fuse structure element; forming a thin silicon oxide layer on said fuse structure element; forming said stack of materials on said thin silicon oxide layer, with said stack of materials comprised of an underlying polysilicon layer, and comprised of overlying dielectric layers; forming a photoresist shape on the top surface of an dielectric layer, with an opening in said photoresist shape exposing a portion of the top surface of said dielectric layer; performing a dry etch procedure to form a first fuse structure opening in a portion of said overlying dielectric layers, exposed in said opening in said photoresist shape, with said first fuse structure opening exposing a portion of a top surface of said polysilicon layer; and performing a wet etch procedure to remove said photoresist shape, and to in situ remove said portion of said polysilicon layer exposed in said first fuse structure opening, with said wet etch procedure selectively terminating at the top surface of said thin silicon oxide layer, resulting in a final fuse structure opening featuring said fuse structure element, covered by said thin silicon oxide layer, exposed at bottom of said final fuse structure opening.