Ceramic-titanium nitride electrostatic chuck
First Claim
1. A ceramic electrostatic chuck which comprises:
- two insulating layers made from a ceramic material and an electrode layer made from a metal and integrally sandwiched between the insulating layers;
the ceramic material consisting of a mixture of a resistive ceramic material having a volume resistivity of at least 1×
1014 ohm.cm at 20°
C. and means to provide the ceramic material of the insulating layers with a volume resistivity in the range from 1×
108 to 1×
1013 ohm.cm at 20°
C., said means being titanium nitride, the amount of titanium nitride not exceeding 5% by weight based on the amount of the resistive ceramic material.
1 Assignment
0 Petitions
Accused Products
Abstract
Proposed is a ceramic-made electrostatic chuck consisting of two insulating ceramic layers and a metallic electrode layer integrally sandwiched between the two insulating layers, which has a very quick response characteristic to turning-on and -off of the electric voltage applied to the electrodes without affecting the very high electrostatic attracting force. This improvement can be obtained by forming the insulating ceramic layers from a specific ceramic material consisting of a highly resistive ceramic material such as alumina and the like and titanium nitride admixed with the former in an amount not exceeding 5% by weight but sufficient to impart the insulating ceramic layers with a volume resistivity in the range from 1×108 to 1×1013 ohm.cm at 20° C.
62 Citations
3 Claims
-
1. A ceramic electrostatic chuck which comprises:
-
two insulating layers made from a ceramic material and an electrode layer made from a metal and integrally sandwiched between the insulating layers; the ceramic material consisting of a mixture of a resistive ceramic material having a volume resistivity of at least 1×
1014 ohm.cm at 20°
C. and means to provide the ceramic material of the insulating layers with a volume resistivity in the range from 1×
108 to 1×
1013 ohm.cm at 20°
C., said means being titanium nitride, the amount of titanium nitride not exceeding 5% by weight based on the amount of the resistive ceramic material. - View Dependent Claims (2, 3)
-
Specification