Patent ID: 7745328

Claim:
A method of processing a substrate, comprising: providing a substrate having conductive features formed in a dielectric material to a processing chamber; forming a plurality of layers on the substrate, comprising: a first dielectric layer formed in direct contact with the dielectric material, the first dielectric layer having barrier properties and comprising silicon, carbon, and nitrogen; a second dielectric layer having barrier properties and comprising silicon and carbon, wherein the second dielectric layer is nitrogen free; and a third dielectric layer comprising silicon, oxygen, and carbon, wherein the third dielectric layer has a dielectric constant of about 3 or less, wherein the second dielectric layer is formed by reacting a processing gas, comprising: a compound containing carbon and oxygen; and an oxygen-free organosilicon compound comprising an organosilicon compound having the formula SiH a (CH 3 ) b (C 6 H 5 ) c , wherein a is 0 to 3, b is 0 to 3, and c is 1 to 4.