Patent ID: 7022569

Claim:
A method of forming a lower electrode contact structure of a capacitor, said method comprising: forming a contact hole through a lower insulation layer disposed on a semiconductor substrate having an active region so as to expose the active region; providing an insulating material on the sides of the contact hole to thereby form a sidewall spacer; forming a recessed contact plug in the contact hole and which plug occupies only a lower portion of the contact hole; removing a portion of the lower insulation layer until the resulting upper surface thereof is situated beneath the level of an upper portion of the sidewall spacer, whereby the upper portion of the sidewall spacer protrudes above the resulting upper surface of the lower insulation layer; and subsequently forming a lower electrode of a capacitor on the recessed contact plug, on said portion of the sidewall spacer protruding above the upper surface of the lower insulation layer, and on a portion of the upper surface of the lower insulation layer that borders the contact hole.