Patent ID: 6726996
Filing Date: 2004-04-27
Classification: B32B,H01L,Y10T

Abstract:
A diffusion barrier formed on a substrate, said diffusion barrier comprising a dielectric stack having at least two dielectric films, each film having a dielectric constant of about 8 or less, wherein said dielectric stack comprises alternating films composed of a first material and a second material,wherein said first material is disposed on one surface of the substrate and in contact therewith, the substrate includes a semiconductor wafer, said first material is characterized as a low-permeability material effective to retard diffusion of at least one of oxygen and water vapor, said second material is characterized as a high-permeability material less effective than said first material to retard diffusion of at least one of oxygen and water vapor, and said second material has a dielectric constant less than about 4.