Patent ID: 6441419
Filing Date: 2002-08-27
Classification: H01L

Abstract:
In an integrated circuit (IC) having upper interconnect layer and a lower interconnect layer in which each interconnect layer comprises a conductor formed of a metal capable of atom diffusion or ion migration, an improved capacitor located between the upper and lower interconnect layers comprising:upper and lower capacitor plates; capacitor dielectric material separating the plates; the upper plate includes a plurality of U-shaped portions; the lower plate includes a plurality of U-shaped portions which extend generally parallel to the U-shaped portions of the upper plate; each U-shaped portion includes a pair of leg portions connected at a base portion; the lower plate having a portion directly contacting a conductor positioned within the lower interconnect layer; the upper plate having a portion directly contacting a conductor positioned within the upper interconnect layer; the portions of the upper and lower plates which directly contact the conductors forming plate barrier layers to prevent atom diffusion or ion migration from the conductors at those direct contact locations; and the conductor of the upper interconnect layer includes a plurality of finger portions which project into a plurality of the U-shaped portions of the upper plate.