High density plasma deposition and etching apparatus
First Claim
1. Structure for use in generating a high density plasma for use in the processing of a substrate, said structure comprising:
- a plasma generation chamber;
an inner magnet and an outer magnet surrounding said plasma generation chamber, said inner magnet having a smaller diameter than the diameter of said outer magnet such that said outer magnet is located around said inner magnet and in the same plane as said inner magnet, thereby to produce a magnetic field for use with said plasma generation chamber; and
means for shielding each of said inner and outer magnets such that radio frequency energy is not absorbed by said inner and outer magnets.
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Accused Products
Abstract
Plasma deposition or etching apparatus is provided which comprises a plasma source located above and in axial relationship to a substrate process chamber. The plasma source may include a sapphire or alumina source tube for use with plasmas containing fluorine. Surrounding the plasma source are an inner magnetic coil and an outer magnetic coil arranged in the same plane perpendicular to the axis of the plasma source and the substrate process chamber. Preferably a first current is provided through the inner coil and a second current in a direction opposite to the direction of the first current is provided through the outer coil. The inner and outer coils are wrapped with a thin sheet of conducting material to shield the coils from RF signal generated by the plasma source. The result is to advantageously shape the magnetic field in the process chamber to achieve extremely uniform processing, particularly when a unique diamond shaped pattern of gas feed lines is used wherein the diamond is arranged to be approximately tangent at four places to the outer circumference of the workpiece being processed in the apparatus.
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Citations
13 Claims
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1. Structure for use in generating a high density plasma for use in the processing of a substrate, said structure comprising:
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a plasma generation chamber; an inner magnet and an outer magnet surrounding said plasma generation chamber, said inner magnet having a smaller diameter than the diameter of said outer magnet such that said outer magnet is located around said inner magnet and in the same plane as said inner magnet, thereby to produce a magnetic field for use with said plasma generation chamber; and means for shielding each of said inner and outer magnets such that radio frequency energy is not absorbed by said inner and outer magnets. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Structure for use in generating a high density plasma for use in the processing of a substrate, said structure comprising:
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a plasma generation chamber; a magnet surrounding said plasma generation chamber, thereby to produce a magnetic field for use with said plasma generation chamber; and means for shielding said magnet such that radio frequency energy is not absorbed by said magnet. - View Dependent Claims (12, 13)
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Specification