Patent ID: 6255161
Filing Date: 2001-07-03
Classification: H01L

Abstract:
A method of forming a capacitor and contact plugs on an active area of a semiconductor substrate, comprising the steps:(a) providing the semiconductor substrate comprising a first source/drain region in a first area, a second source/drain region in a second area, a first insulating layer covering the first source/drain region and the second source/drain region, a first contact plug penetrating the first insulating layer in the second area, a second contact plug penetrating the first insulating layer in the first area, and a second insulating layer positioned on the first insulating layer;(b) forming a first shielding layer on the second insulating layer, the first shielding layer comprising a first opening positioned right above the second contact plug and a second opening positioned right above the first contact plug;(c) forming a second shielding layer to fill the first opening and remain on the sidewall of the second opening as a spacer;(d) forming a third opening passing through the second opening, the second insulating layer and part of the first insulating layer till exposing the top of the first contact plug;(e) forming a first barrier layer on the sidewall and bottom of the third opening and forming a second conducting layer to fill the third opening and thereby connect the first contact plug;(f) forming a fourth opening passing through the first opening till exposing the top of the second contact plug;(g) forming a third conducting layer on the sidewall and bottom of the fourth opening;(h) removing part of the second insulating layer positioned in the first area to expose the third conducting layer that is used as a bottom electrode plate of the capacitor;(i) forming a dielectric layer on the bottom electrode plate, the first insulating layer and the second insulating layer positioned in the first area and then forming a fourth conducting layer on the dielectric layer to be an upper electrode plate of the capacitor;(j) forming a third insulating layer which comprises a fifth opening positioned on the upper electrode plate in the first area and a sixth opening positioned on the third contact plug in the second area;(k) forming a second barrier layer on the sidewall and bottom of the fifth opening and the sixth opening; and(l) forming a fifth conducting layer on the second barrier layer to fill the fifth opening and the sixth opening, wherein the fifth conducting layer in the fifth opening is a fourth contact plug and the fifth conducting layer in the sixth opening is a fifth contact plug.