Patent ID: 6893956

Claim:
A method of forming a metallization layer, the method comprising: depositing a single-layer, low-k barrier layer over a substrate having formed thereon a metal region; during depositing said single-layer, low-k barrier layer, controlling incorporation of a diffusion barrier component into said single-layer, low-k barrier layer such that a concentration of said diffusion barrier component is highest at a first surface of said single-layer, low-k barrier layer facing said metal region and is lowest at a second surface opposite to said first surface, wherein controlling incorporation of said diffusion barrier component includes depositing a first portion of said single-layer, low-k barrier layer, discontinuing supply of a precursor gas containing said diffusion barrier component and depositing a second portion of said single-layer, low-k barrier layer; and depositing a low-k dielectric layer over said single-layer, low-k barrier layer.