Patent ID: 6632719
Filing Date: 2003-10-14
Classification: H01L

Abstract:
A method of forming a capacitor structure comprising:providing a cavity in a substrate, the cavity comprising a sidewall structure, an opening, and a bottom opposite the opening of the cavity; providing a first layer on an inner surface of the sidewall structure, wherein the first layer is electrically conductive; providing a second layer on substantially all of the first layer, the second layer comprising hemispherical grain silicon precursor; providing fill material in the cavity, wherein at least an edge of the second layer is exposed proximate the opening of the cavity; removing the hemispherical grain silicon precursor in the second layer proximate the opening of the cavity to form an edge zone about the opening of the cavity, the edge zone extending from the opening of the cavity towards the bottom of the cavity; and converting the hemispherical grain silicon precursor in the second layer to hemispherical grain silicon, wherein the edge zone is substantially free of the hemispherical grain silicon.