Patent ID: 7781298
Filing Date: 2010-08-24
Classification: H01L

Abstract:
1. A method for forming a capacitor, comprising: providing a substrate; forming a bottom electrode material layer on the substrate; forming a first mask layer on the bottom electrode material layer; forming a second mask layer on the first mask layer; patterning the second mask layer to form a patterned second mask layer in a predetermined region for formation of a capacitor; forming a plurality of hemispherical grain structures on a sidewall of the patterned second mask layer; etching the first mask layer by using the hemispherical grain structures and the patterned second mask layer as a mask, thereby forming a patterned first mask layer having a pattern; transferring the pattern of the first mask layer to the bottom electrode material layer; and forming a capacitor dielectric layer and a top electrode layer on the bottom electrode material layer to form the capacitor.