Patent ID: 6245625
Filing Date: 2001-06-12
Classification: H01L

Abstract:
A fabrication method of a self-aligned contact window, comprising the steps of:providing a semiconductor substrate with a plurality of gates formed on the substrate and a plurality of lightly doped regions formed in the substrate on both sides of the gates, wherein the gates comprise a gate oxide layer, a doped polysilicon layer, a metal silicide layer, and a roof layer;forming a first dielectric layer with a certain thickness on the substrate, such that the upper surface of the first dielectric layer is lower than the upper surfaces of the gates and fully exposing the roof layers of the gates;forming a plurality of spacers on the exposed sidewalls of the gates;conducting an anisotropic etching on the first dielectric layer until a portion of the lightly doped region is exposed, with the gates and the spacers serving as masks;forming a plurality of heavily doped regions in the lightly doped region and in the substrate, with the gates and the spacers serving as masks;forming a second dielectric layer covering the gates; anddefining the second dielectric layer to form a self-aligned contact window.