Patent ID: 6258712
Filing Date: 2001-07-10
Classification: H01L

Abstract:
A method for forming a borderless contact wherein a substrate having a plurality of conductive lines is provided the conductive lines comprising a first barrier layer as an upper layer the method comprising the steps of:forming a first inter-metal dielectric layer on the substrate and located between the conductive lines, wherein a surface level of the first inter-metal dielectric layer is substantially the same as a surface level of the first barrier layer;forming a second barrier layer on the first inter-metal dielectric layer and the first barrier layer;forming a second inter-metal dielectric layer on the second barrier layer;a forming an opening penetrating through the second inter-metal dielectric layer, wherein the second barrier layer is used as an etching stop layer;removing the first and the second barrier layers on a bottom of the opening, so as to expose the conductive lines;forming a liner covering the second inter-metal dielectric layer and the exposed conductive lines exposed through the opening; andforming a conductive layer to fill the opening wherein the first barrier layer includes a material selected from a group consisting of silicon nitride, and silicon-oxy-nitride.