Microwave plasma processing apparatus, slot antenna, and semiconductor device
First Claim
1. A microwave plasma processing apparatus comprising:
- a processing container provided to be sealed by a dielectric window;
a slot antenna including;
(i) a cooling plate disposed above the processing container,(ii) an intermediate metal plate installed on a processing container side of the cooling plate to be spaced apart from the cooling plate, wherein the intermediate metal plate has a donut-shaped convex portion that separates a processing container side surface of the intermediate metal plate into a center side portion and an outer periphery side portion,(iii) a slot plate installed on the processing container side of the intermediate metal plate to be in contact with the convex portion, wherein, on the a processing container side surface of the slot plate, the slot plate includes, as slots for radiating microwaves, a first slot formed closer to the center side portion than a portion which is in contact with the convex portion and a second slot formed farther from the center side portion than the portion which is in contact with the convex portion,(iv) a coaxial waveguide installed in a through hole which is formed in the center side portion in the intermediate metal body to extend continuously through the cooling plate and the intermediate metal plate, wherein the coaxial waveguide includes an inner conductor, an intermediate conductor, and an outer conductor, wherein microwaves are transmitted by each of a space between the inner conductor installed in a hollow portion of the intermediate conductor and the intermediate conductor and a space between the intermediate conductor installed in a hollow portion of the outer conductor and the outer conductor, and wherein a difference between an inner diameter of the outer conductor and an outer diameter of the intermediate conductor is larger than a difference between an outer diameter of the inner conductor and an inner diameter of the intermediate conductor,(v) an inner waveguide configured to transmit microwaves to the first slot by transmitting the microwaves via the space between the inner conductor and the intermediate conductor, and then via a space between the slot plate and the intermediate metal body radially, toward a center side space, the center side space being positioned closer to the center side portion than the convex portion, and(vi) an outer waveguide configured to transmit microwaves to the second slot by transmitting the microwaves via the space between the intermediate conductor and the outer conductor, and then via a space between the intermediate metal body and the cooling plate radially, toward an outer periphery side space, the outer periphery side space being positioned farther from the center side portion than the convex portion; and
the dielectric window installed on the processing container side of the slot plate.
1 Assignment
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Accused Products
Abstract
Disclosed is a microwave plasma processing apparatus. The microwave plasma processing apparatus includes a coaxial waveguide installed in a through hole which is formed in the center side portion in the intermediate metal body to extend continuously through the cooling plate and the intermediate metal plate. The coaxial waveguide includes an inner conductor, an intermediate conductor and an outer conductor. Each of a space between the inner conductor installed in a hollow portion of the intermediate conductor and the intermediate conductor and a space between the intermediate conductor installed in a hollow portion of the outer conductor and the outer conductor transmits microwaves. A difference between an inner diameter of the outer conductor and an outer diameter of the intermediate conductor is larger than a difference between an outer diameter of the inner conductor and an inner diameter of the intermediate conductor.
6 Citations
7 Claims
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1. A microwave plasma processing apparatus comprising:
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a processing container provided to be sealed by a dielectric window; a slot antenna including; (i) a cooling plate disposed above the processing container, (ii) an intermediate metal plate installed on a processing container side of the cooling plate to be spaced apart from the cooling plate, wherein the intermediate metal plate has a donut-shaped convex portion that separates a processing container side surface of the intermediate metal plate into a center side portion and an outer periphery side portion, (iii) a slot plate installed on the processing container side of the intermediate metal plate to be in contact with the convex portion, wherein, on the a processing container side surface of the slot plate, the slot plate includes, as slots for radiating microwaves, a first slot formed closer to the center side portion than a portion which is in contact with the convex portion and a second slot formed farther from the center side portion than the portion which is in contact with the convex portion, (iv) a coaxial waveguide installed in a through hole which is formed in the center side portion in the intermediate metal body to extend continuously through the cooling plate and the intermediate metal plate, wherein the coaxial waveguide includes an inner conductor, an intermediate conductor, and an outer conductor, wherein microwaves are transmitted by each of a space between the inner conductor installed in a hollow portion of the intermediate conductor and the intermediate conductor and a space between the intermediate conductor installed in a hollow portion of the outer conductor and the outer conductor, and wherein a difference between an inner diameter of the outer conductor and an outer diameter of the intermediate conductor is larger than a difference between an outer diameter of the inner conductor and an inner diameter of the intermediate conductor, (v) an inner waveguide configured to transmit microwaves to the first slot by transmitting the microwaves via the space between the inner conductor and the intermediate conductor, and then via a space between the slot plate and the intermediate metal body radially, toward a center side space, the center side space being positioned closer to the center side portion than the convex portion, and (vi) an outer waveguide configured to transmit microwaves to the second slot by transmitting the microwaves via the space between the intermediate conductor and the outer conductor, and then via a space between the intermediate metal body and the cooling plate radially, toward an outer periphery side space, the outer periphery side space being positioned farther from the center side portion than the convex portion; and the dielectric window installed on the processing container side of the slot plate. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A slot antenna installed above a microwave plasma processing container, the slot antenna comprising:
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a cooling plate disposed above the processing container; an intermediate metal plate installed on the a processing container side to be spaced apart from the cooling plate, wherein the intermediate metal plate has a donut-shaped convex portion that separates a processing container side surface of the intermediate metal plate into a center side portion and an outer periphery side portion; a slot plate installed on the processing container side of the intermediate metal plate to be in contact with the convex portion, wherein, on the a processing container side surface of the slot plate, the slot plate includes, as slots for radiating microwaves, a first slot formed closer to the center side portion than a portion which is in contact with the convex portion and a second slot formed farther from the center side portion than the portion which is in contact with the convex portion; a coaxial waveguide installed in a through hole which is formed in the center side portion in the intermediate metal body to extend continuously through the cooling plate and the intermediate metal plate, wherein the coaxial waveguide includes an inner conductor, an intermediate conductor and an outer conductor, wherein each of a space between the inner conductor installed in a hollow portion of the intermediate conductor and the intermediate conductor and a space between the intermediate conductor installed in a hollow portion of the outer conductor and the outer conductor transmits microwaves, and wherein a difference between an inner diameter of the outer conductor and an outer diameter of the intermediate conductor is larger than a difference between an outer diameter of the inner conductor and an inner diameter of the intermediate conductor; and a waveguide configured to transmit microwaves to the second slot by transmitting the microwaves via the space between the intermediate conductor and the outer conductor, and then via a space between the intermediate metal body and the cooling plate radially, toward an outer periphery side space, the outer periphery side space being positioned farther from the center side portion than the convex portion.
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Specification