Electrostatic chuck and method for manufacturing electrostatic chuck
An electrostatic chuck plate is connected to a base plate, which includes a cooling mechanism, by an adhesive layer. The electrostatic chuck plate includes a substrate setting surface on which a processed substrate is set, an electrostatic electrode capable of attracting the processed substrate, and a resistance heat generation body capable of heating the processed substrate. The electrostatic electrode and the resistance heat generation body are incorporated in the electrostatic chuck plate. An adjustment portion is arranged at a position according to a temperature distribution of the substrate setting surface in at least one of the upper surface of the base plate and a lower surface of the electrostatic chuck plate that faces the upper surface through the adhesive layer. The adjustment portion is filled with a resin having a heat conductivity according to the temperature distribution.
1. An electrostatic chuck comprising:
a base plate including a cooling mechanism;
an adhesive layer arranged on an upper surface of the base plate;
an electrostatic chuck plate connected to the base plate by the adhesive layer, wherein the electrostatic chuck plate includes
a substrate setting surface on which a processed substrate is set,
an electrostatic electrode capable of attracting the processed substrate, and
a resistance heat generation body capable of heating the processed substrate,
wherein the electrostatic electrode and the resistance heat generation body are incorporated in the electrostatic chuck plate;
an adjustment portion arranged at a position according to a temperature distribution of the substrate setting surface in a lower surface of the electrostatic chuck plate that faces the upper surface of the base plate through the adhesive layer; and
a resin having a heat conductivity according to the temperature distribution and filled in the adjustment portion.
2. The electrostatic chuck according to claim 1 , further comprising:
an adjustment resin incorporated in the adhesive layer at a position according to the temperature distribution of the substrate setting surface, wherein the adjustment resin has a heat conductivity that differs from that of a resin forming the adhesive layer.
3. The electrostatic chuck according to claim 1 , wherein the adjustment portion is a recess.
4. The electrostatic chuck according to claim 1 , wherein the resin filled in the adjustment portion is formed from a material that is the same as that of a resin forming the adhesive layer.
5. The electrostatic chuck according to claim 1 , wherein the adjustment portion is further arranged at a position according to the temperature distribution of the substrate setting surface in the upper surface of the base plate.
6. The electrostatic chuck according to claim 1 , wherein the adjustment portion is a recess that is recessed from the lower surface of the electrostatic chuck plate toward the substrate setting surface.
7. The electrostatic chuck according to claim 1 , wherein the resistance heat generation body includes first and second resistance heat generation bodies that are arranged in the electrostatic chuck plate and coplanar with each other,
the first resistance heat generation body is located at a position corresponding to a central portion of the substrate setting surface, and
the second resistance heat generation body is located at a position corresponding to a peripheral portion of the substrate setting surface.