Patent ID: 11960211
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A lithography system comprising:
a radiation source;
an optical system configured to receive radiation from the radiation source transmitted through a patterned mask and direct it to a surface of a semiconductor wafer, the optical system comprises a light pipe configured to direct the radiation through the patterned mask to the surface of the semiconductor wafer, the light pipe being between the radiation source and the patterned mask; and
a mask system comprising:
the patterned mask over the semiconductor wafer, a major patterned surface of the patterned mask having a first curvature, the first curvature having a first radius greater than zero; and

a wafer chuck configured to curve and support the semiconductor wafer, the wafer chuck having a top surface with a curvature matching the first curvature, the top surface of the wafer chuck being configured to hold the semiconductor wafer to have the first curvature, wherein the top surface of the wafer chuck is in physical contact with a bottom surface of the semiconductor wafer.