Patent ID: 11892774
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 6:
7. A method, comprising:
forming a photoresist layer over a dielectric layer;
exposing a stitching region of the photoresist layer to a first light-exposure through a first mask, to form a first region which is unexposed and a second region which is exposed;
after exposing the photoresist to the first light-exposure, exposing the stitching region of the photoresist to a second light-exposure through a second mask, wherein a first portion of the first region remains unexposed while a second portion of the first region is exposed during the second light-exposure, wherein the first portion has a shape of a circle; and
after the second light-exposure, developing the photoresist.