Patent ID: 7781346

Claim:
A method of forming a capacitor for a semiconductor device, the method comprising: forming a mold layer on a substrate, the mold layer including an opening through which the substrate is at least partially exposed; forming a thin layer on a surface of the mold layer, a sidewall of the opening and a top surface of the substrate exposed through the opening to form a semiconductor structure; forming a sacrificial layer on the semiconductor structure; removing the sacrificial layer and the thin layer until the surface of the mold layer is exposed, wherein the sacrificial layer and the thin layer remain in the opening; forming a lower electrode from the semiconductor structure by a wet etching process using an etchant; removing foreign matter caused by water in the etchant by performing a dry cleaning process using hydrogen fluoride gas on the semiconductor structure; forming a dielectric layer on the lower electrode; and forming an upper electrode on the dielectric layer, wherein forming the lower electrode includes: removing a residual sacrificial layer remaining in the opening from the substrate; and removing the mold layer from the substrate by the wet etching process using the etchant, wherein the dry cleaning process using the hydrogen fluoride gas is performed on the substrate after the residual sacrificial layer and the mold layer are removed from the substrate.