Patent ID: 6297151
Filing Date: 2001-10-02
Classification: H01L

Abstract:
A method for manufacturing a contact window, comprising the steps of:(a) providing a substrate having a first conductive layer and a first insulating later covering the first conductive layer;(b) forming a trench within the first insulating layer to expose the first conductive layer, wherein the trench is located under a predetermined position of the contact window;(c) forming a conductive spacer on a sidewall of the trench;(d) forming a dielectric layer to cover the surfaces of the first conductive layer, the first insulating layer and the conductive spacer;(e) filling the trench with a second conductive layer to cover the dielectric layer, such that a portion of the second conductive layer located on the predetermined position is thicker than that of adjacent regions;(f) forming a second insulating layer on the second conductive layer;(g) etching the second insulating layer and the second conductive layer to expose the contact window; and(h) forming a third conductive layer on the surface of the contact window.