Patent ID: 8352886

Claim:
A method for the reproducible determination of the position of structures on a mask, comprising the following steps of: providing a mask with a pellicle frame firmly attached thereto; calculating a theoretical model for the bending of the mask with the firmly attached pellicle frame, wherein material properties of the mask, of the pellicle frame, and of the attaching means between the pellicle frame and the mask are taken into account in the calculation of the bending of the mask, and wherein for the calculation of the bending of the mask its contact with three support points is considered; measuring the positions of structures on the mask with a metrology tool; and correcting the measured position of each structure with the theoretical model of the bending of the mask at the respective position of each measured structure, wherein the material properties of the pellicle frame refer to the height, the outside dimensions and the inside dimensions, the Young modulus, the Poisson ratio, and the density of the pellicle frame, which are taken into consideration in the calculation of the theoretical model of the bending of the mask.