Controlled gas mixing for smooth sidewall rapid alternating etch process
First Claim
1. A method for etching features in a silicon layer disposed below a mask in a plasma processing chamber, comprising a plurality of cycles, wherein each cycle comprises:
- providing a deposition phase forming a deposition on the silicon layer in the plasma processing chamber, comprising;
providing a deposition gas into the plasma processing chamber wherein the deposition gas comprises a halogen containing etchant component and a fluorocarbon deposition component;
forming the deposition gas into a plasma, which provides a net deposition on the silicon layer; and
stopping the flow of the deposition gas; and
providing a silicon etch phase, comprising;
providing a silicon etch gas into the plasma processing chamber that is different than the deposition gas;
forming the silicon etch gas into a plasma to etch the silicon layer; and
stopping the flow of the silicon etch gas.
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Accused Products
Abstract
A method for etching features in a silicon layer disposed below a mask in a plasma processing chamber a plurality of cycles is provided. A deposition phase forming a deposition on the silicon layer in the plasma processing chamber is provided comprising providing a deposition gas into the plasma processing chamber wherein the deposition gas comprises a halogen containing etchant component and a fluorocarbon deposition component, forming the deposition gas into a plasma, which provides a net deposition on the silicon layer, and stopping the flow of the deposition gas. A silicon etch phase is provided, comprising providing a silicon etch gas into the plasma processing chamber that is different than the deposition gas, forming the silicon etch gas into a plasma to etch the silicon layer, and stopping the flow of the silicon etch gas.
11 Citations
19 Claims
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1. A method for etching features in a silicon layer disposed below a mask in a plasma processing chamber, comprising a plurality of cycles, wherein each cycle comprises:
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providing a deposition phase forming a deposition on the silicon layer in the plasma processing chamber, comprising; providing a deposition gas into the plasma processing chamber wherein the deposition gas comprises a halogen containing etchant component and a fluorocarbon deposition component; forming the deposition gas into a plasma, which provides a net deposition on the silicon layer; and stopping the flow of the deposition gas; and providing a silicon etch phase, comprising; providing a silicon etch gas into the plasma processing chamber that is different than the deposition gas; forming the silicon etch gas into a plasma to etch the silicon layer; and stopping the flow of the silicon etch gas. - View Dependent Claims (2, 12, 13, 14, 15, 16, 17, 18)
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- 3. The method, as recited in 2, wherein the halogen of the halogen containing etchant component comprises at least one of fluorine, bromine, or chlorine.
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11. The method, as recited in 1, wherein the halogen of the halogen containing etchant component comprises at least one of fluorine, bromine, or chlorine.
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19. A method for etching features in a silicon layer disposed below a mask in a plasma processing chamber, comprising a plurality of cycles, wherein each cycle comprises:
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providing a deposition phase forming a deposition on the silicon layer in the plasma processing chamber, comprising; providing a deposition gas into the plasma processing chamber wherein the deposition gas comprises at least one of SF6, CF4, or NF3 and at least one of C4F8, or C4F6; providing a bias of 50 to 300 volts; forming the deposition gas into a plasma, which provides a net deposition on the silicon layer; and stopping the flow of the deposition gas; and providing a silicon etch phase, comprising; providing a silicon etch gas into the plasma processing chamber that is different than the deposition gas; providing a bias of 50 to 200 volts; forming the silicon etch gas into a plasma to etch the silicon layer; and stopping the flow of the silicon etch gas.
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Specification