Methods and apparatuses for controlling plasma properties by controlling conductance between sub-chambers of a plasma processing chamber
AssigneeLam Research Corporation
InventorAndreas Fischer
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Abstract
A plasma processing system having at least one processing chamber comprising at least two sub-chambers is provided. The two plasma sub-chambers are in plasma flow or gas flow communication through a passage, which is controlled by a gate. The gate may be operated to allow plasma migration between the two sub-chambers to occur at different conductance rates. In one example, the gate comprises two plates with openings through the plates. At least one of the plates may be rotatable relative to the other plates to govern the conductance rate of the plasma from one sub-chamber to the other sub-chamber.
Claims6
A method for processing a substrate using plasma in a plasma processing system having at least one plasma processing chamber, comprising:
- providing a first sub-chamber having a first plasma generation means for generating first plasma having first plasma characteristics;
- providing a second sub-chamber having a second plasma generation means for generating second plasma having second plasma characteristics different from said first plasma characteristics, said second sub-chamber having a work piece holder for supporting said substrate in said second sub-chamber during said processing, wherein a passage interconnects said first sub-chamber and said second sub-chamber, said passage being controlled by a gate for selectively configuring said passage to operate in accordance with at least a first passage condition and a second passage condition, said first passage condition permitting a first conductance rate of said first plasma into said second sub-chamber, said second passage condition permitting a second conductance rate of said first plasma into said second sub-chamber, whereby said first conductance rate is different from said second conductance rate;
- processing said substrate in said second sub-chamber while said gate is operated to permit said first conductance rate;
- and
- processing said substrate in said second sub-chamber while said gate is operated to permit said second conductance rate.
Dependencies are inferred from the claim text.