Patent ID: 6150261
Filing Date: 2000-11-21
Classification: H01L

Abstract:
A method of fabricating a semiconductor device for preventing an antenna effect, comprising the steps of:forming an isolation structure in a semiconductor substrate to define an active region next to the isolation structure;forming a gate comprising a polysilicon layer on the isolation structure;forming a dielectric layer over the substrate;patterning the dielectric layer to form a first opening and a second opening, wherein the first opening exposes a portion of the substrate in the active region and the second opening exposes a portion of the polysilicon layer of the gate;forming a conductive layer on the dielectric layer to fill the first opening and the second opening;removing a portion of the conductive layer until the surface of the conductive layer is level with the surface of the dielectric layer;forming a patterned metallic layer that exposes a portion of the dielectric layer, wherein the metallic layer comprises a first metallic layer and a second metallic layer, the first metallic layer covers a portion of the dielectric layer, and the second metallic layer covers the conductive layer and a portion of the dielectric layer;forming a dielectric layer over the substrate;patterning the dielectric layer to form a first opening and a second opening, wherein the first opening exposes a portion of the first metallic layer, and the second opening exposes a portion of the second metallic layer;forming a glue/barrier layer and a tungsten layer over the substrate;removing portions of the tungsten layer and the glue/barrier layer to form a tungsten plug and a first remaining glue/barrier layer in the first opening, and a tungsten spacer and a second remaining glue/barrier layer on a sidewall of the second opening;forming a third metallic layer over the substrate;forming a patterned photoresist layer on the third metallic layer above the tungsten plug;removing a portion of the third metallic layer and the second metallic layer with the photoresist layer and the tungsten spacer serving as masks; andremoving the photoresist layer and the spacer.