Patent ID: 7573061
Filing Date: 2009-08-11
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 undoped carbon-rich silicon carbide, the layer having a composition of at least 40 atomic % carbon (C) and a dielectric constant of less than about 4, wherein the layer is a reaction product of a plasma reaction of one or more silicon carbide precursors, wherein at least one precursor is selected from the group consisting of ethynyltrimethylsilane, tri-isopropylsilane, 3-(trimethylsilyl)cyclopentene, and vinyldimethylsilane; 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.