Patent ID: 8518819

Claim:
A method for forming a contact structure in a semiconductor device, comprising: providing a semiconductor device substructure with a dielectric layer having a plurality of contact openings extending therethrough, each said contact opening terminating at a respective bottom surface, at least one said bottom surface being a silicide surface and at least one other bottom surface being a further surface; forming a composite base layer on said respective bottom surfaces using a multi-step IMP (ionized metal plasma) deposition process, said composite base layer including a lower layer of a first material formed using a high AC bias power and an upper layer of said first material formed using a low AC bias power, said high AC bias power greater than said low AC bias power; forming a layer of a second material on said composite base layer using chemical vapor deposition (CVD); and depositing a conductive plug material in said plurality of contact openings and contacting said layer of second material.