Patent ID: 6150207
Filing Date: 2000-11-21
Classification: H01L

Abstract:
A method for fabricating a crown capacitor with a rough surface on a substrate having a semiconductor diffusion region comprising the steps of:forming a conducting layer which contacts the semiconductor diffusion region on the substrate;forming an insulating layer on the conducting layer to form a stacked layer comprising the insulating layer and the conducting layer;defining the stacked layer to form a residue portion of the stacked layer adjacent to the semiconductor diffusion region;forming a plurality of first conducting spacers adjacent to side-walls of the stacked layer;forming a plurality of second conducting spacers having a rough surface adjacent to the first conducting spacers;forming a plurality of third insulating spacers adjacent to the second conducting spacers with the rough surface;removing the insulating layer and the third insulating spacers to form a storage-node capacitor plate composed of the first conducting spacers, the second conducting spacers, and the conducting layer;forming a dielectric layer on the storage-node capacitor plate; andforming an upper plate on the dielectric layer.