Patent ID: 7829158

Claim:
A method of forming a multi-layer film, comprising: disposing a substrate in a process chamber; heating the substrate; exposing the substrate to a tantalum containing precursor to adsorb at least a portion of the tantalum containing precursor on a surface of the substrate; purging the process chamber with a purge gas; exposing the substrate to a process space comprising helium and hydrogen ionized at a first radio frequency power to form a first tantalum containing layer on the surface; exposing the substrate to the tantalum containing precursor to adsorb at least a portion of the precursor on the first tantalum containing layer; purging the process chamber with the purge gas; and exposing the substrate to the process space at a second radio frequency power to form a second tantalum containing layer, wherein the first tantalum containing film has a higher nitrogen-content than the second tantalum containing film, wherein the second radio frequency power is greater than the first radio frequency power, and wherein the Ta-containing precursor is selected from the group consisting of TAIMATA, PDEAT, PEMAT, PDMAT, TBTEMAT, Ta(NC 2 C 2 H 5 )(N(C 2 H 5 ) 2 ) 3 , Ta(NC(CH 3 ) 2 C 2 H 5 )(N(CH 3 ) 2 ) 3 , and Ta(NC(CH 3 ) 3 )(N(CH 3 ) 2 ) 3 .