Patent ID: 7282438
Filing Date: 2007-10-16
Classification: H01L,Y10S

Abstract:
1. A copper diffusion barrier film, for use in a semiconductor device, the copper diffusion barrier film comprising: at least one layer of carbon-rich silicon carbide, the layer having a composition of at least 40% carbon (C) and a dielectric constant of less than about 4; and one or more additional layers of silicon carbide forming a stack, wherein at least one of the additional layers has a dielectric constant higher than the dielectric constant of the carbon-rich silicon carbide, wherein the diffusion barrier film has an effective dielectric constant of less than about 4.5, and wherein in addition to a layer of undoped silicon carbide, the copper diffusion barrier stack comprises one or more layers selected from the group consisting of oxygen-doped silicon carbide and nitrogen-doped silicon carbide.