Patent ID: 7498179
Filing Date: 2009-03-03
Classification: H01L

Abstract:
1. A method of forming a semiconductor device, the method comprising: forming an interlayer dielectric and a contact plug on a substrate, the interlayer dielectric surrounding the contact plug; depositing a first barrier metal layer on the interlayer dielectric and the contact plug; depositing a material layer on the first barrier metal layer, the material layer contiguous with the first barrier metal layer; depositing a second barrier metal layer on the material layer to form an oxygen barrier layer that includes the first barrier metal layer, the material layer, and the second barrier metal layer, the second barrier metal layer contiguous with the material layer; and forming a bottom electrode layer on the second barrier metal layer, the bottom electrode layer in electrical contact with the second barrier metal layer, wherein forming the oxygen barrier layer comprises depositing a single elemental layer as the first barrier metal layer, and wherein depositing the material layer comprises depositing a layer consisting of titanium or tantalum.