Patent ID: 11927879
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 15:
16. A method comprising:
loading a semiconductor wafer into a wafer stage of an extreme ultraviolet (EUV) photolithography equipment equipped with an extreme ultraviolet (EUV) photomask;
in the EUV photolithography equipment, sequentially performing a shot process a plurality of times, the shot process including aligning the semiconductor wafer and irradiating light from an extreme ultraviolet (EUV) light source to the semiconductor wafer; and
unloading the semiconductor wafer from the EUV photolithography equipment,
wherein the semiconductor wafer has a plurality of shot regions, each shot region of the plurality of shot regions has an upper shot region formed by one shot process of the shot process performed the plurality of times, and a lower shot region formed by another shot process of the shot process performed the plurality of times,
a central area of each shot region comprises a wafer alignment mark region, and
the wafer alignment mark region comprises alignment patterns of a first wafer alignment mark formed by the one shot process and alignment patterns of a second wafer alignment mark formed by the another shot process.