Patent ID: 6472023
Filing Date: 2002-10-29
Classification: C23C,H01L

Abstract:
A process for displacement depositing a seed layer over a barrier layer on a substrate, wherein said seed layer thus deposited can act as an electrically conducting layer required during filling fine vias through electroplating; said process comprising steps of:(1) preparing displacement deposition solution, consisting of 0.2-20 g/l of palladium ionic compound, 0.6-60 g/l of halogen ionic compound, 0.09-9 g/l of inorganic acid and 10-1000 ppm of surfactant, wherein said surfactant is polyethylene glycol, polypropylene glycol, or ethylene oxide (EO)/propylene oxide (PO) copolymer and having a pH of about 1 to 7.0; and (2) immersing said substrate having said barrier layer thereon in said depositing solution prepared as in step (1) at a temperature of 20 to 70Â° C. for 1-20 minutes.