Patent ID: 6319767
Filing Date: 2001-11-20
Classification: H01L

Abstract:
A method for fabricating a metal-insulator-metal capacitor comprising:providing an insulating layer overlying a semiconductor substrate;depositing a first metal layer over said insulating layer;depositing a capacitor dielectric layer overlying said first metal layer;depositing a second metal layer overlying said capacitor dielectric layer;depositing a hard mask layer overlying said second metal layer;forming a first photoresist mask overlying said hard mask layer;patterning said hard mask layer, said second metal layer, said capacitor dielectric layer, and said first metal layer using said first photoresist mask as an etching mask to form a metal stack whereby patterned said first metal layer forms a bottom electrode of said capacitor;reducing in size said first photoresist mask to form a second photoresist mask;patterning said hard mask layer using said second photoresist mask as an etching mask;removing said second photoresist mask; andpatterning said second metal layer using said hard mask layer as an etching mask whereby said second metal layer forms a top electrode of said capacitor to complete fabrication of said metal-insulator-metal capacitor.