Patent ID: 11953838
Assignee: ASML HOLDING N.V.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 18:
19. A method of removing particles of a contaminant comprising a first material from a working surface comprising a second material, the method comprising:
pressing a cleaning substrate against the working surface, wherein the working surface comprises a plurality of burls, the cleaning substrate comprising a base having a lateral surface, a conductive coating covering the lateral surface, and a coating on at least part of a top surface of the conductive coating, the coating comprising a third material and a raised corner for removing particles of the contaminant and the coating only covering a part of the base, wherein an uncoated part of the top surface of the conductive coating is located in an inner portion of a confrontation area with the working surface and wherein a bond dissociation energy of a bond between the first material and the second material is less than a bond dissociation energy of a bond between the second material and the third material, such that the contaminant transfers from the working surface to the coating; and
moving the cleaning substrate away from the working surface to remove the contaminant from the working surface.