Patent ID: 8279576
Filing Date: 2012-10-02
Classification: H01L,Y10T

Abstract:
1. A ceramic electrostatic chuck that includes an embedded electrode, the electrostatic chuck comprising: a dielectric layer on which a wafer can be placed, the dielectric layer being formed of sintered aluminum nitride containing Sm and having a volume resistivity in the range of 4×10 a support layer that is in contact with the back side of the dielectric layer, is formed of sintered aluminum nitride containing Sm and Ce, and has a volume resistivity of 1×10 wherein the dielectric layer is formed of sintered aluminum nitride that contains an Al—Sm—O compound. Sm being contained in an amount 1.2% to 4% by weight in terms of Sm wherein the support layer is harmed of sintered aluminum nitride that contains oxides of Sm and Ce, Sm being contained in an amount 0.96% to 2.2% by weight in terms of Sm wherein Ce is contained only in the support layer.