Electrostatic chuck with polymer protrusions
First Claim
Patent Images
1. An electrostatic chuck comprising:
- a surface layer activated by a voltage in an electrode to form an electric charge to electrostatically clamp a substrate to the electrostatic chuck, the surface layer including a plurality of polymer protrusions and a charge control layer to which the plurality of polymer protrusions adhere, the charge control layer being a polymer charge control layer and comprising a surface resistivity of between about 108 ohms per square to about 1011 ohms per square, the plurality of polymer protrusions extending to a height above portions of the charge control layer surrounding the plurality of polymer protrusions to support the substrate upon the plurality of polymer protrusions during electrostatic clamping of the substrate.
9 Assignments
0 Petitions
Accused Products
Abstract
In accordance with an embodiment of the invention, there is provided an electrostatic chuck. The electrostatic chuck comprises a surface layer activated by a voltage in an electrode to form an electric charge to electrostatically clamp a substrate to the electrostatic chuck. The surface layer includes a plurality of polymer protrusions and a charge control layer to which the plurality of polymer protrusions adhere, the plurality of polymer protrusions extending to a height above portions of the charge control layer surrounding the plurality of polymer protrusions to support the substrate upon the plurality of polymer protrusions during electrostatic clamping of the substrate.
-
Citations
31 Claims
-
1. An electrostatic chuck comprising:
a surface layer activated by a voltage in an electrode to form an electric charge to electrostatically clamp a substrate to the electrostatic chuck, the surface layer including a plurality of polymer protrusions and a charge control layer to which the plurality of polymer protrusions adhere, the charge control layer being a polymer charge control layer and comprising a surface resistivity of between about 108 ohms per square to about 1011 ohms per square, the plurality of polymer protrusions extending to a height above portions of the charge control layer surrounding the plurality of polymer protrusions to support the substrate upon the plurality of polymer protrusions during electrostatic clamping of the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
-
31. A method of manufacturing an electrostatic chuck, the method comprising:
-
bonding a dielectric layer of the electrostatic chuck to an insulator layer of the electrostatic chuck using a bonding polymer comprising at least one of polytetrafluoroethylene (PTFE), modified polytetrafluoroethylene (PTFE), perfluoroalkoxy (PFA), fluorinated ethylene-propylene (FEP) and polyether ether ketone (PEEK); coating the dielectric layer of the electrostatic chuck with an adhesion coating layer comprising at least one of silicon containing nitride, silicon containing oxide, silicon containing carbide, non-stoichiometric silicon containing nitride, non-stoichiometric silicon containing oxide, non-stoichiometric silicon containing carbide, carbon and a nitride compound of carbon; bonding a charge control layer comprising a charge control layer polymer to the surface of the electrostatic chuck, the charge control layer polymer comprising at least one of polyetherimide (PEI), polyimide and polyether ether ketone (PEEK), the charge control layer comprising a surface resistivity of between about 108 ohms per square to about 1011 ohms per square; depositing a photoresist onto the charge control layer; reactive ion etching the charge control layer to remove portions of the charge control layer that will surround a plurality of polymer protrusions being formed in the charge control layer; and stripping the photoresist off the electrostatic chuck, thereby revealing the plurality of polymer protrusions being formed of the same charge control layer polymer as the charge control layer.
-
Specification