Patent ID: 11899377
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 15:
16. A method, comprising:
performing an exposure process on a semiconductor workpiece comprising:
exposing a first workpiece by using a first reticle;
measuring a temperature profile of the first reticle after the exposing;
repeating the exposing and the measuring to generate a target overlay performance data set;
determining a target state of the first reticle on the basis of the target overlay performance data set, wherein the target state is a saturation state in which a deformation of the first reticle is substantially unchanged;
regulating a second reticle to reach a state that is similar to the target state of the first reticle; and
exposing the semiconductor workpiece by using the second reticle.