Patent ID: 7820507

Claim:
A method of fabricating a semiconductor device, comprising: forming an ILD layer in which a contact plug is formed on a substrate; recessing the ILD layer in a predetermined depth to protrude a predetermined portion of the contact plug above the ILD layer; forming an etch stop layer over the ILD layer, covering the contact plug; forming a sacrificial insulation layer on the etch stop layer with an etch selectivity ratio different from the etch stop layer; etching a predetermined portion of the sacrificial insulation layer and the etch stop layer until a top portion of the contact plug is exposed to form an opening; forming a bottom electrode of a capacitor over the opening and the sacrificial insulation layer; and removing the sacrificial insulation layer to expose the etched etch stop layer having the bottom electrode formed in the opening, wherein the bottom electrode is formed, allowing a bottom surface of the bottom electrode to contact with the etched etch stop layer and the top portion of the contact plug, and wherein a top surface of the contact plug is formed to contact with the bottom surface of the bottom electrode and the etched etch stop layer.