Patent ID: 7338878
Filing Date: 2008-03-04
Classification: H01L

Abstract:
1. A method for forming a capacitor, comprising: providing a substrate with an insulator layer; forming a hole in the insulator layer, the hole having an opening, a side surface and a bottom surface, the side surface having a bowing shape in a plane perpendicular to the substrate; forming a film of a conductive material on the insulator layer and on the side surface and the bottom surface of the hole; exposing the film and the insulator layer to a chemical-mechanical polishing process to remove the film and the insulator in part in a direction perpendicular to the substrate so as to form a lower electrode of the conductive material and a polished insulator, the polished insulator defining a widened opening larger in size than the opening; forming a capacitor dielectric on the lower electrode; and forming an upper electrode on the capacitor dielectric, wherein forming the hole comprises: