Patent ID: 8405217

Claim:
A method for preparing a multi layer composite device which comprises the steps of (A) forming a dielectric layer on the surface of a composite material having at least one area made of a dielectric material and at least one area made of copper or copper alloy, by bringing said surface of said composite material into contact: a) either with a solution, comprising at least one compound selected from the group consisting of: the diazonium salt of aniline; a diazonium salt bearing at least one functional group selected from the group consisting of silane, silazane, siloxane, amine, hydroxyl and carboxyl groups ;or a precursor of said diazonium salt; and an amine compound of formula H 2 N-A-X—Z in which: A is selected from the group consisting of an aryl group, which can be unsubstituted or substituted with a hydroxyl group, a lower alkyl group or a halogen atom; a group —CH—X—B in which —B is an aryl or heteroaryl group; X is a single bond or an alkylene group having 1 to 4 carbon atoms; Z is a functional group selected from the group consisting of silane, silazane, siloxane, amine, hydroxyl and carboxyl groups, b) or with a first solution containing an aryl diazonium salt and successively a second solution containing a compound bearing at least one functional group selected from the group consisting of silane, silazane, siloxane, amine, hydroxyl and carboxyl groups and bearing at least one functional group capable of reacting with the aryl radical grafted on the surface of the composite material that is a product of the aryl diazonium salt; (B) forming an overlayer, said overlayer consisting of a Si-containing dielectric Cu-Etch Stop Layer and/or copper diffusion barrier, said overlayer is formed directly on the dielectric layer obtained in step (A) that is formed on at least one area made of a dielectric material and at least one area made of copper or copper alloy.