Patent ID: 6734089
Filing Date: 2004-05-11
Classification: H01L

Abstract:
A method of fabricating a wordline comprising the acts of:(a) providing a first dielectric layer over a substrate; (b) disposing a polysilicon layer over the dielectric layer; (c) disposing a barrier layer over the polysilicon layer; (d) disposing a conductive layer over the barrier layer; (e) disposing a nitride layer over the conductive layer; (f) forming a first intermediate layer between the barrier layer and the polysilicon layer; (g) forming a second intermediate layer between the barrier layer and the first intermediate layer; (h) etching through each of the nitride layer, the conductive layer, the second intermediate layer, the first intermediate layer and partially through the polysilicon layer to form wordline stacks; (i) annealing the substrate to eliminate the second intermediate layer; and (j) etching the wordline through the remainder of the polysilicon layer.