Patent ID: 11940620
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 15:
16. A method of cleaning a collector of an extreme ultraviolet light source system, comprising:
introducing the collector, separated from the extreme ultraviolet light source system, into a chamber of a cleaning apparatus, the cleaning apparatus including a controller;
capturing an optical image of a reflective surface of the collector using a first measuring device;
measuring a contamination level of the reflective surface by comparing the optical image with a pre-stored standard image;
performing a first cleaning operation if the contamination level exceeds a preset first reference value, the first cleaning operation including physically cleaning the reflective surface by spraying dry ice particles onto the reflective surface using a first cleaning apparatus; and
performing a second cleaning operation if the contamination level is less than or equal to the preset first reference value, the second cleaning operation including chemically cleaning the reflective surface by radiating atmospheric plasma onto the reflective surface using a second cleaning apparatus and measuring a microcontamination level of the reflective surface and a damage level of the reflective surface using a second measuring device,
wherein the controller is configured to control an operation of the cleaning apparatus such that the cleaning apparatus performs the first cleaning operation if the contamination level exceeds the preset first reference value and the cleaning apparatus performs the second cleaning operation if the contamination level is less than or equal to the preset first reference value.