Patent ID: 7550386
Filing Date: 2009-06-23
Classification: H01L

Abstract:
1. A method for depositing two or more seed layers suitable for electroplating metallic interconnects over a substrate, the substrate having a patterned insulating layer which includes at least one opening and a field surrounding the at least one opening, the at least one opening and the field being ready for depositing one or more seed layers, the at least one opening having top corners, sidewalls, and bottom, and the method comprising: depositing by a PVD technique a PVD seed layer over the substrate, said PVD seed layer being sufficiently thick over the field to enable uniform electroplating across the substrate, wherein said PVD seed layer has no substantial overhangs sealing or pinching-off the top corners of the at least one opening; and depositing by a CVD technique a CVD seed layer over the PVD seed layer, wherein: (i) the CVD seed layer having a thickness of less than about 300 Å over the field, (ii) the CVD seed layer is continuous over the sidewalls and bottom surfaces, (iii) at least one of the seed layers comprises a material selected from a group consisting of Cu, Ag, or alloys comprising one or more of these metals, and (iv) the seed layers inside the at least one opening leave sufficient room for electroplating inside the at least one opening.