Plasma processing apparatus capable of controlling plasma emission intensity
First Claim
1. A plasma processing apparatus comprising:
- a processing vessel, the pressure of which can be lowered;
a stage for mounting a sample within said processing vessel;
an antenna electrode having a substantially circular shape, arranged on a plane of the processing vessel, which is located opposite to the stage, and positioned parallel to the stage;
gas conducting means for supplying processing gas into the processing vessel;
an external coil which forms a magnetic field within said processing vessel and produces plasma within said processing vessel due to a mutual reaction occurred between the formed magnetic field and an electromagnetic wave radiated from the antenna electrode;
an emission monitor for monitoring emission intensity of plasma present in at least 3 different points along a radial direction of said antenna electrode; and
a control unit for adjusting an energizing current supplied to said external coil;
wherein;
said control unit adjusts the energizing current supplied to the external coil based upon the monitoring result obtained from said emission monitor so as to control the emission intensity of the plasma to become uniform emission intensity.
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Accused Products
Abstract
An antenna electrode having a substantially circular shape, is arranged on a plane of a processing vessel, which is located opposite to a stage for mounting a sample within the processing vessel, and positioned parallel to the stage. An emission monitor monitors emission intensity of plasma present in at least 3 different points along a radial direction of the antenna electrode. A control unit adjusts an energizing current supplied to an external coil for forming a magnetic field within the processing vessel. The control unit adjusts the energizing current supplied to the external coil based upon the monitoring result obtained from the emission monitor so as to control the emission intensity of the plasma to become uniform emission intensity.
108 Citations
9 Claims
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1. A plasma processing apparatus comprising:
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a processing vessel, the pressure of which can be lowered;
a stage for mounting a sample within said processing vessel;
an antenna electrode having a substantially circular shape, arranged on a plane of the processing vessel, which is located opposite to the stage, and positioned parallel to the stage;
gas conducting means for supplying processing gas into the processing vessel;
an external coil which forms a magnetic field within said processing vessel and produces plasma within said processing vessel due to a mutual reaction occurred between the formed magnetic field and an electromagnetic wave radiated from the antenna electrode;
an emission monitor for monitoring emission intensity of plasma present in at least 3 different points along a radial direction of said antenna electrode; and
a control unit for adjusting an energizing current supplied to said external coil;
wherein;
said control unit adjusts the energizing current supplied to the external coil based upon the monitoring result obtained from said emission monitor so as to control the emission intensity of the plasma to become uniform emission intensity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In a plasma processing apparatus comprising:
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a processing vessel, the pressure of which can be lowered;
a stage for mounting a sample within said processing vessel;
an antenna electrode having a substantially circular shape, arranged on a plane of the processing vessel, which is located opposite to the stage, and positioned parallel to the stage;
gas conducting means for supplying processing gas into the processing vessel; and
an external coil which forms a magnetic field within said processing vessel and produces plasma within said processing vessel due to a mutual reaction occurred between the formed magnetic field and an electromagnetic wave radiated from the antenna electrode,a plasma processing method for plasma-processing said sample by employing said plasma, comprising the steps of;
monitoring emission intensity of plasma present in at least 3 different points along a radial direction of said antenna electrode; and
adjusting an energizing current supplied to said external coil in response to a ratio of the emission intensity monitored in the respective points so as to control the emission intensity of the plasma to become uniform emission intensity.
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Specification