Patent ID: 7670903

Claim:
A method for fabricating a cylindrical capacitor, the method comprising: forming an isolation structure including an interlayer on a substrate, the substrate having a plurality of contact plugs formed therein, wherein the interlayer comprises a first amorphous carbon-based layer, and wherein forming the isolation structure includes forming a first insulation layer, the first amorphous carbon-based layer, a second insulation layer, and a second amorphous carbon-based layer over the substrate; forming a plurality of opening regions by etching the isolation structure, thereby exposing selected portions of the contact plugs; forming storage nodes on a surface of the opening regions; etching selected portions of the isolation structure to form a patterned interlayer that encompasses selected portions of the storage nodes, thereby supporting the storage nodes; removing remaining portions of the isolation structure; and removing the patterned interlayer to expose inner and outer walls of the storage nodes.