Patent ID: 11913113
Assignee: LAM RESEARCH CORPORATION
Field: Surface technology, coating (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 11:
12. A method for processing a substrate, wherein the substrate is located below a showerhead in a processing chamber, comprising:
depositing a deposition layer on the substrate located below the showerhead in the processing chamber, using a deposition process, wherein the deposition process flows at least one deposition gas through the showerhead;
flowing a secondary purge gas during the deposition process from a location outside of the showerhead in the processing chamber forming a flow curtain around an outer edge of the showerhead, wherein the secondary purge gas is tuned to cause the deposition process to either have a dome shape or bowl shape non-uniformity; and
providing a complementary etch back non-uniform process that is complementary to the deposition process on the substrate located below the showerhead in the processing chamber, wherein the deposition layer after the non-uniform etch back process is more uniform than the deposition layer before the non-uniform etch back process.