Patent ID: 11899373
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 18:
19. An electron beam lithography system, comprising:
a wafer stage configured to receive a wafer coated with a photo resist;
an electron beam optics to provide an electron beam toward the wafer stage;
a processor; and
a non-transitory memory storing a program,
wherein the program, when executed by the processor, causes the processor to perform:
receiving a layout pattern comprising one or more features and information of the photo resist, wherein the layout pattern is produced by an electron beam in the photo resist on the wafer;
determining a first energy density indirectly exposed to a first feature of the one or more features of the layout pattern in the photo resist when the one or more features of the layout pattern in the photo resist are directly exposed by the electron beam;
adjusting a second energy density of the first feature when the first feature is directly exposed by the electron beam, wherein a total energy density of the first feature that is a sum of the first energy density from the indirect exposure and the second energy density from the direct exposure, and the total energy density is maintained at a threshold energy level that is a lowest energy density that fully exposes the photo resist; and
generating a set of commands that comprises one or more timings and one or more deflection angles for the main controller to control the electron beam to directly expose the first feature of the layout pattern to the second energy density.