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

Claim 27:
28. 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 first cleaning substrate against a first portion of the working surface, the cleaning substrate comprising a base having a lateral surface, a conductive coating covering the lateral surface, and a first coating on at least part of a top surface of the conductive coating including a raised corner for removing the contaminant and the coating only covering a part of the base and having a lateral size and shape corresponding to a size and shape of the first portion, the first coating comprising a third material, wherein the working surface comprises a plurality of burls, 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, so that the contaminant transfers from the first portion to the first coating;
moving the first cleaning substrate away from the working surface to remove the contaminant from the first portion of the working surface;
pressing a second cleaning substrate against a second portion of the working surface, the second cleaning substrate comprising a base having a lateral surface, a conductive coating covering the lateral surface, and a second coating on at least part of a top surface of the conductive coating including a raised corner and having a lateral size and shape corresponding to a size and shape of the second portion, the second coating comprising a third material, 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, so that the contaminant transfers from the second portion to the second coating; and
moving the second cleaning substrate away from the working surface to remove the contaminant from the second portion of the working surface.