Patent ID: 6951826

Claim:
A method of processing a substrate, comprising: depositing a silicon carbide barrier layer adjacent the substrate, wherein the silicon carbide barrier layer is deposited by: introducing silicon, carbon, and a noble gas into a chamber; initiating a plasma in the chamber; and reacting the silicon and the carbon in the presence of the plasma to deposit silicon carbide material; depositing a dielectric layer adjacent the silicon carbide barrier layer; depositing an etch stop adjacent the dielectric layer, wherein the etch stop comprises silicon carbide deposited by: introducing silicon, carbon, and a noble gas into a chamber; initiating a plasma in the chamber; and reacting the silicon and the carbon in the presence of the plasma to deposit silicon carbide material, wherein the silicon carbide etch stop has a dielectric constant of less than about 5 and has a reflectivity of about 7 percent or less at ultraviolet wavelengths; and depositing a photoresist layer adjacent the etch stop.