Plasma processing method and apparatus
First Claim
1. A plasma processing method for processing a substrate, said method comprising:
- placing the substrate on an electrode in a vacuum chamber;
introducing a gas into the vacuum chamber while discharging gas from the interior of the vacuum chamber;
applying a high frequency voltage to a spiral discharge coil while maintaining a pressure in the vacuum chamber so as to generate plasma inside of the vacuum chamber, wherein the spiral discharge coil has a coil pitch;
varying at least one control parameter while the substrate is being processed, wherein the control parameters include gas type, gas flow rate, pressure, magnitude of the high frequency power applied to the spiral discharge coil and the electrode, and their power frequency; and
changing the pitch of the spiral discharge coil in a diameter direction of the coil in accordance with the timing of the varying of any of the control parameters so as to control the plasma density in-plane distribution.
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Accused Products
Abstract
In a plasma processing method, a substrate is processed by placing the substrate on an electrode in a vacuum chamber, introducing a gas into the vacuum chamber while discharging gas from inside vacuum chamber, applying a high frequency voltage to a spiral discharge coil while keeping the vacuum chamber internally at a pressure to generate a plasma inside the vacuum chamber. At least one of the control parameters of gas type, gas flow rate, pressure, magnitudes of high frequency powers applied to the coil and the electrode, and their high frequency power frequencies is varied while the substrate is processed. The method includes a step of allowing a plasma density in-plane distribution to be controlled in accordance with the timing of varying any of the control parameters.
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Citations
16 Claims
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1. A plasma processing method for processing a substrate, said method comprising:
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placing the substrate on an electrode in a vacuum chamber; introducing a gas into the vacuum chamber while discharging gas from the interior of the vacuum chamber; applying a high frequency voltage to a spiral discharge coil while maintaining a pressure in the vacuum chamber so as to generate plasma inside of the vacuum chamber, wherein the spiral discharge coil has a coil pitch; varying at least one control parameter while the substrate is being processed, wherein the control parameters include gas type, gas flow rate, pressure, magnitude of the high frequency power applied to the spiral discharge coil and the electrode, and their power frequency; and changing the pitch of the spiral discharge coil in a diameter direction of the coil in accordance with the timing of the varying of any of the control parameters so as to control the plasma density in-plane distribution. - View Dependent Claims (2, 3, 4)
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5. A plasma processing method for forming a film on a substrate, said method comprising:
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placing the substrate on an electrode disposed in a vacuum chamber; introducing gas into the vacuum chamber while discharging gas from the interior of the vacuum chamber; applying a high frequency voltage to a spiral discharge coil while maintaining the pressure in the vacuum chamber at a level to generate a plasma inside of the vacuum chamber; varying at least one control parameter while the substrate is processed, wherein the control parameters include gas type, gas flow rate, pressure, magnitude of high frequency power applied to the spiral discharge coil and the electrode, and their power frequency; and changing a shape of the spiral discharge coil so that uniformity of film forming rate, obtained before and after varying the control parameter, is compensated in accordance with a timing of varying the control parameter during the course of forming the film. - View Dependent Claims (6, 7)
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8. A plasma processing method for etching a substrate, the method comprising:
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placing the substrate on an electrode in a vacuum chamber; introducing gas into the vacuum chamber while discharging gas from inside of the vacuum chamber; applying a high frequency voltage to a spiral discharge coil while maintaining an interior pressure in the vacuum chamber so as to generate a plasma inside of the vacuum chamber; varying at least one of a plurality of control parameters while the substrate is being processed, wherein the control parameters includes gas flow type, gas flow rate, pressure, magnitude of the high frequency power applied to the spiral discharge coil and the electrode, and the power frequency; and changing a shape of the spiral discharge coil so that a uniformity of etching rate, obtained before and after said varying of the at least one control parameter, is compensated in accordance with a timing of varying the at least one control parameter during the course of etching. - View Dependent Claims (9, 10)
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11. A plasma processing apparatus comprising:
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a vacuum chamber; an electrode for receiving a substrate thereon, said electrode being disposed in said vacuum chamber; a spiral discharge coil provided on a surface of said vacuum chamber, said spiral discharge coil having a shape and a coil pitch; a high frequency voltage source for applying a high frequency voltage to said spiral discharge coil in order to generate a plasma; and a device for changing the shape of said spiral discharge coil so that the coil pitch, in a diameter direction of said spiral discharge coil, is partially changed, thereby allowing a plasma density in-plane distribution to be controlled. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification