Wafer holding device
First Claim
1. A wafer holding device, comprising a wafer holding stage of ceramics having at least one internal electrode and a top surface on which at least a wafer is to be mounted, a base block supporting said stage integrated thereto, and a braze material layer to join the stage and the base block between which the layer is interposed, wherein the base block is formed of a porous ceramics and a metal filled in pores of a bulk of the ceramics, a thermal expansion coefficient of the base block is within 3×
- 10-6 /°
C. of a thermal expansion coefficient of the stage, and the braze material layer comprises an aluminum-based braze material.
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Abstract
A wafer holding device is provided, which comprised a wafer holding stage of ceramics having a internal electrode and a top surface on which at least a wafer is to be mounted, a base block supporting said stage integrated thereto, and a braze material layer to join the stage and the base block therebetween which the layer is interposed, wherein the base block is formed a porous ceramics and a metal filled in pores of the ceramics, the porous ceramics has a thermal expansion coefficient within 3×10-6 /° C. of the difference of the thermal expansion coefficient with respect to the ceramics of the stage, and the braze material layer comprises a aluminum-based braze material.
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Citations
7 Claims
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1. A wafer holding device, comprising a wafer holding stage of ceramics having at least one internal electrode and a top surface on which at least a wafer is to be mounted, a base block supporting said stage integrated thereto, and a braze material layer to join the stage and the base block between which the layer is interposed, wherein the base block is formed of a porous ceramics and a metal filled in pores of a bulk of the ceramics, a thermal expansion coefficient of the base block is within 3×
- 10-6 /°
C. of a thermal expansion coefficient of the stage, and the braze material layer comprises an aluminum-based braze material. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- 10-6 /°
Specification