Patent ID: 11914302
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Optics (Instruments)
Classification: CPC G  H | IPC G  H

Claim 16:
17. A lithography method in semiconductor fabrication, comprising:
generating a plurality of first drops of a target material through a first nozzle group selected from a plurality of nozzles to form a first elongated droplet;
generating a first laser pulse to convert the first elongated droplet into a first plasma that generates a first extreme ultraviolet (EUV) radiation;
reflecting the first EUV radiation by a collector mirror having an optical axis;
generating a plurality of second drops of the target material through a second nozzle group selected from the plurality of nozzles to form a second elongated droplet, the second elongated droplet being oblique with the optical axis of the collector mirror at a different angle than the first elongated droplet;
generating a second laser pulse to convert the second elongated droplet into a second plasma that generates a second EUV radiation; and
exposing a semiconductor substrate to the first and second EUV radiations.