Patent ID: 7842605
Filing Date: 2010-11-30
Classification: C23C,H01L

Abstract:
1. A method of processing a layer of material on a semiconductor substrate having a recessed feature, the method comprising: (a) depositing a layer of a first diffusion barrier material on the semiconductor substrate, to coat at least a bottom portion of the recessed feature; and (b) performing a plurality of profiling cycles, wherein each profiling cycle comprises a net etching operation removing a first portion of a material residing at the bottom of the recessed feature and a net deposition operation depositing a second portion of the first diffusion barrier material at the bottom of the recessed feature, the removed portion of the material being greater than the deposited portion of the material for at least one of the profiling cycles, and wherein performing the plurality of profiling cycles achieves net material etching at the bottom portion of the recessed feature; (c) depositing a layer of second diffusion barrier material on the semiconductor substrate, to coat at least the bottom portion of the recessed feature; and (d) performing a plurality of profiling cycles, wherein each profiling cycle comprises a net etch-back operation and a net deposition operation, wherein the net deposition operation comprises depositing the second diffusion barrier material.