Patent ID: 6570752
Filing Date: 2003-05-27
Classification: G03F,H01L

Abstract:
A substrate-holding device, comprising:a wafer-chuck body defining an adhesion surface and comprising an electrostatic electrode, the adhesion surface being configured to contact a downstream-facing surface of a substrate whenever the substrate is being held by the substrate-holding device by an electrostatic force generated by the electrode; the adhesion surface defining a channel configured, whenever the substrate is adhered to the adhesion surface by the electrostatic force, to provide a conduit for a heat-transfer gas that, when flowing through the conduit, contacts and removes heat from the downstream-facing surface of the substrate; a gas-supply system connected to the channel and configured to supply a flow of the heat-transfer gas to the channel; a substrate-adhesion-confirmation device situated and configured to detect whether the substrate is adhered to the adhesion surface; and a controller connected to the substrate-adhesion-confirmation device and to the gas-supply system, the controller being configured to cause the gas-supply system to supply the flow of the heat-transfer gas to the channel after the substrate-adhesion-confirmation device has confirmed adhesion of the substrate to the adhesion surface.