Plasma source and plasma processing apparatus
There is provided a plasma source comprising: a housing that defines a plasma generation space; a gas inlet disposed at the housing and configured to introduce a gas; a power supply part disposed at the housing and configured to supply a radio frequency (RF) power; a supply port disposed at the housing and configured to supply active species of plasma produced from the gas in the plasma generation space; a dielectric plate that is disposed at the housing, transmits the RF power from the power supply part to the plasma generation space, and has an opening at a center thereof; a slot formed between the power supply part and the dielectric plate and through which the RF power propagates; and a gas supply line disposed at the housing, and having one end connected to the gas inlet and the other end from which a gas is supplied to the opening.
1 . A plasma source comprising:
a housing that defines a plasma generation space;
a gas inlet disposed at the housing and configured to introduce a gas;
a power supply part disposed at the housing and configured to supply a radio frequency (RF) power;
a supply port disposed at the housing and configured to supply active species of plasma produced from the gas in the plasma generation space;
a dielectric plate that is disposed at the housing, transmits the RF power from the power supply part to the plasma generation space, and has an opening at a center thereof;
a slot formed between the power supply part and the dielectric plate and through which the RF power propagates; and
a gas supply line disposed at the housing, and having one end connected to the gas inlet and the other end from which a gas is supplied to the opening,
wherein the gas supply line and the slot are separated in the housing, and
the slot has a deficit portion where the slot is not formed when viewed from above, and the gas supply line is formed at the deficit portion.
2 . The plasma source of claim 1 , wherein the opening is in direct contact with the gas.
3 . The plasma source of claim 1 , wherein the gas supply line near the opening is covered with a ceramic protective member.
4 . The plasma source of claim 3 , wherein the opening has a stepped portion at a corner portion, and
an inner surface of the opening and an inner surface of the protective member are formed on the same plane by fitting an end portion of the protective member into the stepped portion.
5 . The plasma source of claim 1 , wherein the slot is formed in a C shape when viewed from above.
6 . The plasma source of claim 5 , wherein a length of the slot in a circumferential direction is n×λ/2 (mm)±λ/16 (mm), where λ is a wavelength of the RF power propagating through the slot, and n is an integer of 1 or more.
7 . The plasma source of claim 5 , wherein a width of the slot in a radial direction is 10 (mm)±5 (mm).
8 . The plasma source of claim 5 , wherein the thickness of the slot is less than λ/2, where λ is the wavelength of the RF power propagating through the slot.
9 . The plasma source of claim 8 , wherein the thickness of the slot is λ/8 or less.
10 . The plasma source of claim 1 , wherein the power supply part is provided with a resonator.
11 . The plasma source of claim 10 , wherein the resonator is a comb-shaped resonator.
12 . The plasma source of claim 1 , wherein the gas inlet is formed on a sidewall of the housing, and
the gas supply line extends horizontally from the gas inlet in the housing, and extends vertically along the axis of the housing toward the opening.
13 . A plasma processing apparatus comprising the plasma source described in claim 1 .