Patent ID: 6852373

Claim:
A method for depositing a dielectric material on copper on the surface of a structure, entailing the following steps: placing the structure in a deposit chamber of chemical vapor deposition or plasma assisted chemical vapor deposition, adding to the chamber a first gas forming a precursor for the formation of the dielectric material and containing an element able to contaminate copper, adding to the chamber a second gas containing a chemical element intended, together with the element contained in the first gas and able to contaminate copper, to form said dielectric material, the second gas being able to react with the first gas to give a deposit of dielectric material, performing the deposit of dielectric material from the first gas and the second gas, the method also comprising a step for adding a third gas able to prevent the contamination of copper by said element contained in the first gas in which the third gas comprises at least one member selected from the group consisting of oxygen, nitrogen, and carbon and the third gas is present during the adding of the first and second gases.