Patent ID: 6458653
Filing Date: 2002-10-01
Classification: H01L

Abstract:
A method for forming lower electrodes of a cylinder-shaped capacitor, the method comprising:sequentially forming a buffer layer and an etch stopper on a semiconductor substrate including a conductive region; forming a sacrificial dielectric layer on the etch stopper; forming a first opening extending through the sacrificial dielectric layer; depositing a slope-improving layer that improves the sidewall slope of the first opening over the sacrificial dielectric layer and within the first opening; removing a portion of the slope-improving layer, the etch stopper and the buffer layer adjacent the first opening to form a second opening that exposes the conductive region; forming a conductive layer over a surface of the second opening to form cylinder-shaped lower electrodes electrically coupled to the conductive region; and removing portions of the conductive layer to form the cylinder-shaped lower electrodes separated from each other.