| 摘要 |
An electrostatic chuck (113) having grooves (130, 132, 134) to uniformly distribute a heat transfer medium, e.g., a gas, and a method of fabricating such an electrostatic chuck. Specifically, a grooved layer (112) is formed upon a surface (110) of a conventional chuck body (111). Typically, a conventional chuck body contains a substrate (100) having one or more electrodes (104, 106) deposited thereupon and a first layer (108), typically formed of an insulating material, disposed over the electrodes and a surface of the substrate which supports the electrodes. A second layer (112), typically formed of an insulating material, is formed by screen printing a paste of insulating material over a surface of the first layer. The paste is applied in a pattern which includes at least one gap. After curing the paste into a hard layer, the second layer contains the gap or gaps defined by the screen pattern. The combination of the surface of the first layer and the gaps in the second layer define a grooved surface pattern. The second layer supports a workpiece during subsequent workpiece processing. A hole (216) through the substrate and the first layer provides a portal through which a gas can be pumped into the grooves. With this arrangement, the medium promotes substantially uniform heat exchange between the workpiece and the electrostatic chuck. <IMAGE> |
