Patent ID: 11860555
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 10:
11. A non-transitory computer readable storage medium, having stored thereon instructions executable by a computer, wherein when the instructions are executed, the computer is enabled to execute operations of:
acquiring a first time at which an exposure machine performs exposure of a first wafer, and acquiring a second time at which the exposure machine performs alignment of a second wafer, wherein the exposure machine comprises an alignment platform and an exposure platform, when a wafer is located on the exposure platform, the wafer is defined as the first wafer, the first wafer has exposure parameters, when the wafer is located on the alignment platform, the wafer is defined as the second wafer, the second wafer has the alignment mark count; and a same wafer passes through the alignment platform and the exposure platform in sequence to complete the exposure process;
acquiring a first buffer time between the second time and the first time when the first time is less than the second time;
determining, according to the exposure parameters of the first wafer and a corresponding relationship, a target alignment mark count of the second wafer when the first buffer time is greater than a preset value, wherein the corresponding relationship is a relationship between exposure parameters and alignment mark counts, and the corresponding relationship is used to make the first buffer time to be less than or equal to the preset value; and
outputting the target alignment mark count;
wherein the exposure parameters of the first wafer comprise, an exposure dose of the first water and an exposure shot count of the first wafer, the corresponding relationship comprises a first corresponding relationship and a second corresponding relationship, the first corresponding relationship is a relationship between exposure doses and alignment mark counts, the second corresponding relationship is a relationship between exposure shot counts and alignment mark counts, and the second corresponding relationship is that Y_=0.7012X−57.099, X represents the exposure shot count of the first wafer, and Y represents the alignment mark count of the second wafer.