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

Claim 7:
8. 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:
obtaining a layout pattern having one or more features to be generated in the photo resist material over the wafer;
determining a first energy density indirectly exposed to a first feature of the one or more features of the layout pattern on the photo resist when the one or more features of the layout pattern in the photo resist are directly exposed by the electron beam; and
adjusting a second energy density exposed to the first feature when the first feature is directly exposed by the electron beam, so that a total energy density received by the first feature 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 to fully expose the first feature in the photo resist.