Patent ID: 11899357
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 16:
17. A mask for use in a semiconductor lithography process, the mask comprising:
a substrate having first, second, third, and fourth edges in which the first and second edges are on opposite sides of the substrate and the third and fourth edges are on opposite sides of the substrate;
a light absorbing layer patterned to define a mask pattern disposed on the substrate and a light absorbing border surrounding the mask pattern;
wherein a peripheral region is located outside of the light absorbing border on two sides of the light absorbing border, the light absorbing layer not being disposed on the substrate in the peripheral region;
wherein the light absorbing border is inset from the first and second edges of the substrate to define the peripheral region located outside of the light absorbing border; and
wherein the light absorbing border is not inset from the third and fourth edges of the substrate.