Patent ID: 8178436
Filing Date: 2012-05-15
Classification: H01L

Abstract:
1. A method, comprising: forming a bi-layer over a copper conductive layer in a first interlayer dielectric (ILD) layer on a substrate, wherein the bi-layer comprises a compressive silicon carbide nitride layer on a tensile silicon nitride layer having a tensile stress in the range of 50 Megapascals to 900 Megapascals, wherein the compressive silicon carbide nitride layer is configured to compensate for the tensile silicon nitride layer, and wherein the tensile silicon nitride layer is deposited onto the copper conductive layer and the first ILD layer, wherein the copper conductive layer is deposited in the first ILD layer on the substrate to form one or more conductive lines; and forming a second interlayer dielectric (ILD) layer on the compressive silicon carbide nitride layer, wherein the bi-layer comprising the compressive silicon carbide nitride layer on the tensile silicon nitride layer adds the tensile stress at the copper conductive layer and increases adhesion between the copper conductive layer, the first ILD layer and the second ILD layer and is capable of being an etch stop layer.