Method and system for controlling radical distribution
First Claim
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1. A method of controlling the pressure in a plasma processing chamber, comprising:
- evacuating chamber gases from a peripheral region of a processing region proximate to a substrate being processed in said plasma processing chamber;
evacuating chamber gases substantially from a center of said processing region through an evacuation port in a gas injection assembly located above said substrate, the evacuation port having a baffle plate with at least two openings and being limited to a central region of the gas injection assembly; and
controlling said evacuating the gases using at least one of a pump or a valve such that a first magnitude of a process parameter within said center of the processing region is adjusted relative to a second magnitude of the process parameter at the peripheral region of the processing region to provide more uniformity in the process parameter across the processing region.
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Abstract
A plasma processing system includes a processing chamber, a substrate holder configured to hold a substrate for plasma processing, and a gas injection assembly. The gas injection assembly includes a first evacuation port located substantially in a center of the gas injection assembly and configured to evacuate gases from a central region of the substrate, and a gas injection system configured to inject gases in the process chamber. The plasma processing system also includes a second evacuation port configured to evacuate gases from a peripheral region surrounding the central region of the substrate.
38 Citations
15 Claims
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1. A method of controlling the pressure in a plasma processing chamber, comprising:
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evacuating chamber gases from a peripheral region of a processing region proximate to a substrate being processed in said plasma processing chamber; evacuating chamber gases substantially from a center of said processing region through an evacuation port in a gas injection assembly located above said substrate, the evacuation port having a baffle plate with at least two openings and being limited to a central region of the gas injection assembly; and controlling said evacuating the gases using at least one of a pump or a valve such that a first magnitude of a process parameter within said center of the processing region is adjusted relative to a second magnitude of the process parameter at the peripheral region of the processing region to provide more uniformity in the process parameter across the processing region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification