Patent ID: 7470992
Filing Date: 2008-12-30
Classification: H01L

Abstract:
1. A barrier layer stack for contacting an aluminum alloy, comprising: a semiconductor process wafer comprising an exposed conductive region; a dielectric layer with an opening formed therethrough over the semiconductor process wafer, exposing the conductive region; a first barrier layer stack comprising at least one TiN and one Ti layers blanket overlying the opening and contacting the conductive region, wherein the TiN layer is contacted with the Ti layer; an overlying aluminum alloy layer in contact with the first barrier layer stack; and a second barrier layer stack comprising at least one TiN and one Ti layers overlying and contacting the aluminum alloy layer, wherein the TiN layer is contacted with the Ti layer; wherein the conductive region is selected from the group consisting of silicon, polysilicon, tungsten, aluminum, and alloys thereof.