Plasma processing apparatus and method of manufacturing semiconductor device using the same
Disclosed are a plasma processing apparatus and a method of manufacturing a semiconductor device using the same. The plasma processing apparatus comprises a chamber, an electrostatic chuck in the chamber and loading a substrate, a plasma electrode generating an upper plasma on the electrostatic chuck; and a hollow cathode between the plasma electrode and the electrostatic chuck, wherein the hollow cathode generates a lower plasma below the upper plasma. The hollow cathode comprises cathode holes each having a size less than a thickness of a plasma sheath of the upper plasma.
1. A plasma processing apparatus, comprising:
a chamber;
an electrostatic chuck in the chamber and loading a substrate;
a plasma electrode generating an upper plasma on the electrostatic chuck; and
a hollow cathode between the plasma electrode and the electrostatic chuck,
wherein the hollow cathode generates a lower plasma below the upper plasma, and
wherein the hollow cathode comprises:
an insulation plate comprising cathode holes each having a size less than a thickness of a plasma sheath between the hollow cathode and the upper plasma;
a bottom electrode in the insulation plate, wherein the bottom electrode comprises lower holes;
a top electrode in the insulation plate disposed above the bottom electrode, wherein the top electrode comprises upper holes aligned with the lower holes,
a shutter plate included in a gap between the top electrode and the bottom electrode, the shutter plate comprising shutter holes aligned with the cathode holes.
2. The plasma processing apparatus of claim 1 , wherein the size of each of the cathode holes is equal to or less than 0.5 mm.
3. The plasma processing apparatus of claim 1 , wherein each of the cathode holes has an entrance opening and an exit opening, wherein each of the entrance opening and the exit opening having a size greater than the size of each of the cathode holes, and wherein the size of each of the cathode holes being measured between the lower holes and the upper holes.
4. The plasma processing apparatus of claim 3 , wherein the insulation plate has stepped inner walls in the cathode holes between the entrance opening and the exit opening.
5. The plasma processing apparatus of claim 4 , wherein each of the stepped inner walls has a height equal to or less than 5 mm.
6. The plasma processing apparatus of claim 3 , wherein the insulation plate has inclined inner walls in the cathode holes between the entrance opening and the exit opening.
7. The plasma processing apparatus of claim 1 , wherein the hollow cathode further comprises bottom electrodes and top electrodes in the insulation plate,
wherein the bottom electrodes extend in a first direction,
wherein the top electrodes extend in a second direction intersecting the first direction, and
wherein the cathode holes, the lower holes, and the upper holes are disposed at intersections of the bottom electrodes and the top electrodes.
8. A plasma processing apparatus, comprising:
a chamber;
an electrostatic chuck in the chamber and loading a substrate;
a plasma electrode generating an upper plasma on the electrostatic chuck; and
a hollow cathode between the plasma electrode and the electrostatic chuck,
wherein the hollow cathode generates a lower plasma below the upper plasma,
wherein the hollow cathode comprises an insulation plate comprising:
cathode holes;
bottom electrodes that comprises lower holes having a size greater than that of the cathode holes;
top electrodes disposed above the bottom electrodes, the top electrodes comprising upper holes aligned with the lower holes; and
a shutter plate included in a gap between the top electrodes and the bottom electrodes, the shutter plate comprising shutter holes aligned with the cathode holes, and being configured to rotate in the insulation plate.
9. The plasma processing apparatus of claim 8 , wherein the shutter holes are smaller than the cathode holes.
10. The plasma processing apparatus of claim 1 , further comprising a bias power supply providing the bottom electrode with a bias power output.
11. The plasma processing apparatus of claim 1 , further comprising a source power supply providing the top electrode with a source power output.
12. The plasma processing apparatus of claim 1 , further comprising a high-frequency power supply providing the plasma electrode with a high-frequency power output.
13. The plasma processing apparatus of claim 1 , wherein the cathode holes filter ions in the upper plasma, and allow radicals in the upper plasma to pass through the cathode holes.
14. The plasma processing apparatus of claim 1 , wherein the chamber comprises:
a lower housing;
an upper housing on the lower housing; and
a ground plate disposed between the upper housing and the lower housing, wherein the ground plate supports the hollow cathode.