Patent ID: 6487063
Filing Date: 2002-11-26
Classification: H01L,H02N

Abstract:
An electrostatic wafer chuck, comprising:a base plate comprising a first region and a second region, the first region including a central region and a peripheral segment region, and the second region including a general peripheral region that, in combination with the peripheral segment region, surrounds the central region; an insulating layer overlying the base plate and defining a wafer-mounting surface of the chuck; first and second electrode sets situated between the base plate and insulating layer, the first electrode set being located in the first region so as to occupy the central region and peripheral segment region, and the second electrode set being located in the second region so as to occupy the general peripheral region; and a power supply connected to the first and second electrode sets, the power supply being configured, at start of energizing the chuck to electrostatically hold a substrate to the wafer-mounting surface, to electrically energize the first electrode set before energizing the second electrode set.