Patent ID: 11899367
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Optics (Instruments)
Classification: CPC G  H | IPC G

Claim 13:
14. A charged particle beam lithography system comprising:
a stage configured to secure a workpiece having an energy sensitive layer; and
a charged particle beam exposure unit configured to:
expose a first region of the energy sensitive layer that corresponds with a target feature to a first dose of a charged particle beam, wherein the target feature is in a target pattern area of an integrated circuit (IC) design layout,
expose a second region of the energy sensitive layer that corresponds with a dummy feature to a second dose of the charged particle beam, wherein the dummy feature is in the target pattern area of the IC design layout,
wherein the first dose is less than a third dose implemented for exposing the first region of the energy sensitive layer when the target pattern area of the IC design layout includes the target feature without the dummy feature, and
wherein an unexposed region of the energy sensitive layer corresponds with a background area in the target pattern area of the IC design layout.