Patent ID: 6821884
Filing Date: 2004-11-23
Classification: H01L

Abstract:
A method for forming at least one opening in an insulating layer on a substrate while depositing a barrier layer on side walls of the opening without essentially depositing the barrier layer on a bottom of the opening, the method comprising the steps of:subjecting the substrate to a plasma, the plasma being generated in a gaseous mixture comprising at least three components, the components comprising a first component for depositing the metal barrier layer on at least the side walls of the opening, a second component for forming an opening in the insulating layer, and a third component for removing the barrier layer being formed on the bottom of the opening, wherein the first component is selected from the group consisting of 1-methyl silane, 2-methyl silane, 3-methyl silane, 4-methyl-silane, a mixture of SiH4 and N2, a mixture of WF6 and N2, and combinations thereof, wherein the second component is selected from the group consisting of NxOy, CxFyHxOu, N2/O2 mixtures, N2/H2 mixtures, O2, O3, NH3, CO, CO2, CH4, and combinations thereof, and wherein the third component comprises a chemical compound that forms a halogen ion or a halogen radical in the plasma; etching the insulating layer with the plasma; and depositing the barrier layer on the side walls of the opening with the plasma.