ELECTRODE STRUCTURE FOR ICP ETCHER
The invention relates to an electrode structure for ICP etcher, including: inductive coils, inductive coil connectors, connect rods and sleeve; in which, inductive coils are set on insulation window and insulation window is set on chamber lid; two ends of the connect rods respectively connect inductive coils and inductive coil connectors; the sleeve is made of conductive material and grounded; first end of the sleeve is covered by a cap while the second is opening; the cap has holes, and the connect rods are set pass through the holes and isolated from the cap; the opening of sleeve is set toward inductive coils, and the inductive coils are shielded inside the sleeve. This invention shields electromagnetic field generated by inductive coil connectors outside the sleeve to avoid influence of even electromagnetic field generated to inductive coils, and guarantee even etching.
1 . An electrode structure for ICP etcher, wherein, it includes: inductive coils, inductive coil connectors, connect rods and sleeve; in which,
inductive coils are set on insulation window and insulation window is set on chamber lid of the ICP etcher;
two ends of the connect rods respectively connect inductance coils and inductance coil connectors;
the sleeve is made of conductive material and is grounded; first end of the sleeve is covered by a cap while the second end is opening; the cap has holes, and the connect rods are set pass through the holes and isolated from the cap; the opening of sleeve is set towards inductive coils, and the inductive coils are shielded inside the sleeve.
2 . The electrode structure according to claim 1 , wherein, the hole diameter on cap is larger than that of the connect rods so the holes and connect rods have gap to realize the isolation between connect rods and cap.
3 . The electrode structure according to claim 1 , wherein, an insulation pad is set between the holes and connect rods to make connect rods isolate from cap.
4 . The electrode structure according to claim 1 , wherein, the second end of sleeve sets a flanging, by which the sleeve is fixed ON chamber lid; the flanging contacts with chamber lid so as to make sleeve be grounded through the chamber lid.
5 . The electrode structure according to claim 1 , wherein, it further contains snap ring, the second end of sleeve sets a flanging, the sleeve is fixed onto insulation window by the flanging; the snap ring sets on outer wall of sleeve and contacts with chamber lid to make sleeve be grounded through the chamber lid and snap ring.
6 . The electrode structure according to claim 1 , wherein, the conductive material of sleeve is metal Cu, Al or Ag, or their combination, or magnetic shielding metal materials.
7 . The electrode structure according to claim 1 , wherein, the inductive coils are circular, and the sleeve is cylindrical.
8 . The electrode structure according to claim 1 , wherein, the part of connect rods covered by the sleeve is arranged vertically.
9 . The electrode structure according to claim 1 , wherein, multiple connect rods connecting with inductive coils; the first connect rods connect with radio-frequency power supply through the first inductive coil connectors, and the second connect rods connect with grounding end through the second inductive coil connectors.
10 . The electrode structure according to claim 1 , wherein, it further includes multiple inductive coil connectors, the inductive coil connectors arranged laterally and above the cap of the sleeve.