Patent ID: 7719045

Claim:
A capacitor for a semiconductor device, the capacitor comprising: a lower electrode having a cylindrical shape; a dielectric layer that includes a metal oxide, the dielectric layer disposed on an inner surface, a top surface, and an outer surface of the lower electrode, the dielectric layer formed along a profile of the lower electrode; and an upper electrode including a first sub-electrode and a second sub-electrode, the first sub-electrode disposed on a surface of the dielectric layer along the profile of the lower electrode, the first sub-electrode including a first metal nitride layer in which a first stress is applied, the second sub-electrode disposed on a surface of the first sub-electrode that corresponds to a top surface of the lower electrode, the second sub-electrode including a second metal nitride layer in which a second stress is applied, the second stress in a direction opposite to a direction of the first stress.