Patent ID: 11874597
Assignee: SYNOPSYS, INC.
Field: Optics (Instruments)
Classification: CPC G  H | IPC G  H

Claim 9:
10. A method of improving mask data used in fabrication of a semiconductor device, the method comprising:
defining a cost function associated with a defect based on stochastic failure rate of the defect;
performing a first inverse lithography technique (ILT) optimization of the mask data using nominal values of mask pattern contours;
performing a second ILT optimization of the first ILT optimized mask data using stochastic values of the mask pattern contours until a first value of the cost function is less than or equal to a first target value;
Manhattanizing the mask pattern contours of the second ILT optimized mask data; and
Performing, by a processor, a Manhattan optimization of the Manhattanized mask pattern contours until a second value of the cost function is less than or equal to a second target value.