Patent ID: 6291281
Filing Date: 2001-09-18
Classification: H01L

Abstract:
A method of fabricating a protection device, comprising:providing a substrate of a first conductive type, the substrate further comprising a gate thereon;forming a first heavily doped region of the first conductive type;forming a second heavily doped region of a second conductive type;forming a first dielectric layer on the substrate to cover the gate, the first and the second heavily doped regions, wherein the first dielectric layer having a plurality of plugs penetrating through the first dielectric layer and respectively coupled to the gate, the first and the second heavily doped region;forming a first metal layer on the first dielectric layer to couple the plugs, so as to electrically connect gate, the first and the second heavily doped regions;forming a second dielectric layer on the first metal layer, wherein the second dielectric layer comprising at least one first opening exposing a part of the first metal layer;forming a third dielectric layer on the second dielectric layer to fill the first opening, the third dielectric layer having at least one second opening to expose the part of the first metal layer;forming a glue layer on the third dielectric layer and a surface of the second opening;forming and patterning a second metal layer on the glue layer over the third dielectric layer; andperforming an over etching step until the first metal layer underlying the second opening is removed.