Shower plate sintered integrally with gas release hole member and method for manufacturing the same
A shower plate is disposed in a processing chamber in a plasma processing apparatus, and plasma excitation gas is released into the processing chamber so as to generate plasma. A ceramic member having a plurality of gas release holes having a diameter of 20 μm to 70 μm, and/or a porous gas-communicating body having pores having a maximum diameter of not more than 75 μm communicating in the gas-communicating direction are sintered and bonded integrally with the inside of each of a plurality of vertical holes which act as release paths for the plasma excitation gas.
1. A shower plate disposed in a plasma processing apparatus and releasing plasma excitation gas into the plasma processing apparatus so as to generate plasma,
wherein a ceramic member and a porous gas-communicating body are formed in the inside of each of a plurality of vertical holes as release paths for plasma excitation gas,
the ceramic member has a plurality of gas release holes having a diameter of 20 μm to 70 μm,
the porous gas-communicating body has pores having a maximum diameter of not more than 75 μm, the pores communicating in a gas-communicating direction,
each of gas-communicating paths formed by the communicating pores of the porous gas-communicating body has a narrow path having a pore diameter equal to or less than 10 μm,
the ceramic member is formed in gas-introducing side of the each of the plurality of vertical holes, the porous gas-communicating body is formed in gas-discharging side of the each of the plurality of vertical holes, and
the ceramic member and the porous gas-communicating body are sintered and bonded integrally with the shower plate.
2. The shower plate of claim 1 , wherein the shower plate is formed of a ceramic material, and
the ceramic member is formed of a ceramic material having a dielectric loss between 5×10 −3 and 1×10 −5 .
3. The shower plate of claim 1 , wherein an aspect ratio of lengths to hole diameters of the gas release holes of the ceramic member is equal to or greater than 20.
4. A shower plate disposed in a plasma processing apparatus and releasing plasma excitation gas into the plasma processing apparatus so as to generate plasma,
wherein a first porous gas-communicating body and a second porous gas-communicating body are formed in the inside of each of a plurality of vertical holes as release paths for plasma excitation gas,
the first porous gas-communicating body has first pores having a maximum diameter of not more than 75 μm, the first pores communicating in a gas-communicating direction,
each of gas-communicating paths formed by the communicating first pores of the first porous gas-communicating body has a narrow path having a pore diameter equal to or less than 10 μm,
the second porous gas-communicating body has second pores having a diameter of equal to or more than 10 μm and equal to or less than 30 μm, the second pores communicating in a gas-communicating direction,
the second porous gas-communicating body is formed in gas-introducing side of the each of the plurality of vertical holes, the first porous gas-communicating body is formed in gas-discharging side of the each of the plurality of vertical holes, and
the first porous gas-communicating body and the second porous gas-communicating body are sintered and bonded integrally with the shower plate.
5. The shower plate of claim 4 , wherein the shower plate is formed of a ceramic material, and
the first porous gas-communicating body is formed of a ceramic material having a dielectric loss between 5×10 −3 and 1×10 −5 .